background image

 6 / 8

General information

1

2

Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
Support tel. +49 6441 9642-22
E-mail: [email protected]
www.janitza.com

www

.janitza.com

Doc no. 2.053.007.1.g      Status: 11/2022

Current measuring module 

for the UMG 801

Installation instructions

 Module 800-CT8-A - current measuring module 5 A

Deutsche V

ersion:

siehe V

or

derseite

2

Safety

Safety instructions

The installation instructions do not include a 
complete list of all safety measures necessary for 
operating the device.
Special operating conditions may require 
additional measures. The installation instructions 
contain notes that must be observed for your 
personal safety and to prevent property damage.

Symbols used on the device:

The additional symbol on the 
device itself indicates an electrical 
danger that can result in serious 
injuries or death. 

The general warning symbol calls 
attention to possible risks of injury. 
Observe all the instructions listed 
under this symbol in order to 
prevent injuries or even death.

Safety measures

When operating electrical devices, specific parts 
of these devices and their components inevitably 
carry dangerous voltage. As a result, serious 
personal injuries or property damage can occur if 
they are not handled correctly:

•  Before connection, ground the device and its 

components at the ground wire connection, if 
available.

•  Dangerous voltages may be present in all 

circuit parts connected to the voltage supply.

•  There may still be dangerous voltages present 

in the device or the components even after 
disconnection of the supply voltage (capacitor 
storage).

•  Do not operate equipment with open current 

transformer circuits.

•  Do not exceed the threshold values specified 

in the user manual and on the rating 
plate. This must also be observed during 
inspections and commissioning.

•  Observe the safety instructions and 

warning notices in the usage information 
that accompanies the devices and their 
components!

Qualified personnel

To prevent personal injuries and property damage, 
only qualified personnel with electrical engineering 
training may work on the base unit and its 
components. They must also have knowledge

•  of the national accident prevention regulations.
•  of safety technology standards.
•  in the installation, commissioning and 

operation of the device and the components.

Intended use

The modules/components

•  are intended for 

industrial control usage

 only.

•  are intended as expansion or transfer modules 

for the UMG 801 base unit in switch cabinets 
and small distribution boards. (Please observe 
the usage information associated with the 
base unit).

•  may only be mounted to base units that are 

disconnected from the power supply (see 
“Assembly” step).

•  are not intended for installation in vehicles! 

Use of the base unit with modules in 
stationary equipment is considered an 
unusual environmental condition and is only 
permissible by special agreement.

•  are not intended for installation in areas 

exposed to harmful oils, acids, gases, vapors, 
dust and radiation, etc.

Disclaimer

Observing the usage information for the devices is 
a prerequisite for safe operation and for achieving the 
specified performance characteristics and product 
features. Janitza electronics GmbH assumes no 
liability for personal injuries, property damage and 
financial losses resulting from the failure to observe 
the usage information. Make sure that your usage 
information is legible and accessible.

Further usage information, such as e.g. the 
installation instructions or user manual for the 
base unit, can be found on our web site  
www.janitza.com under Support > Downloads.

Copyright notice

© 2019 - Janitza electronics GmbH - Lahnau.
All rights reserved. Any duplication, processing, 
distribution and any other kind of use, even in 
part, is prohibited.

Subject to technical changes.

•  Make sure that the installation instructions 

match your device.

•  Make sure you have first read and understood 

the usage information accompanying the 
product.

•  Keep the usage information accompanying 

the product accessible through its service life 
and hand it over to the subsequent owner 
where applicable.

•  Please refer to www.janitza.de for information 

concerning device revisions and the 
associated adjustments to the usage 
information accompanying the product.

 

Disposal

Please observe the national regulations. Dispose 
of individual parts, where necessary, depending 
on the properties and existing country-specific 
regulations, e.g. as:

•  Electronic waste
•  Batteries and accumulators
•  Plastic
•  Metals

or commission a certified 
disposal company with the scrapping.

Relevant laws, 
applied standards and directives

Please refer to the Declaration of Conformity 
on our web site (www.janitza.com) for the laws, 
standards and directives applied by Janitza 
electronics GmbH for the device.

3

7

WARNING

Risk of injury due to electric voltage or electrical 

current!

When handling electrical currents or voltages, 

serious personal injuries or death can occur due to:

 · Touching live exposed or stripped cores.

 · Device inputs that are dangerous to touch.

Before starting work on your system:

 ·

Disconnect it from the power supply!

 ·

Secure it against being switched back on!

 ·

Verify disconnection from power!

 ·

Ground and short circuit!

 ·

Cover or block off neighboring parts that are 

under voltage!

Incoming goods inspection

The prerequisites for trouble-free and safe 
operation of the devices and their components 
include proper transport, storage, setup and 
assembly, as well as careful operation and 
maintenance. 
Exercise caution when unpacking and packing 
the device, without using force and only using 
suitable tools.
Check:

•  Devices and components by performing 

a visual inspection to ensure a flawless 
mechanical condition. 

•  The scope of delivery (see user manual) for 

completeness before beginning the installation 
of your devices and components.

If you assume that safe operation is no longer 
possible, shut down your device with the 
components immediately and secure it from being 
unintentionally started back up again.

It can be assumed that safe operation is 
impossible if, for example, the device with 
components:

•  Has visible damage.
•  No longer functions despite an intact power 

supply.

•  Was subjected to extended periods of 

unfavorable conditions (e.g. storage outside 
of the permissible climate thresholds without 
adjustment to the room climate, condensation, 
etc.) or transport stress (e.g. falling from an 
elevated position, even without visible external 
damage, etc.).

User manual:

WARNING

Danger due to noncompliance with warning 

and safety instructions.

Noncompliance with warning and safety 

instructions on the device itself and in the 

information on using the device and its 

components can lead to injury or even death.

Observe safety instructions and warning notices 

on the device itself and in the usage information 

associated with the devices and their components, 

such as:

 · Installation instructions.

 · User manual.

 · Safety instructions supplement.

The current measuring module

 · enhances the scope of functions of the base 

unit with additional current measuring channels 
(2 blocks á 4 current measuring channels).

 · is suitable for current transformers with trans-

former ratios of ../1 A or ../5 A.

Device short description and assembly - current measuring module

Safety instructions in the installation instructions 
are highlighted with a warning triangle and are 
presented as follows depending on the level of risk:

ATTENTION

Warns of an imminently dangerous situation that 

can result in property damage or environmental 

damage in the event of noncompliance.

DANGER

Warns of an imminent danger that will result 

in serious or fatal injuries in the event of 

noncompliance.

CAUTION

Warns of an imminently dangerous situation that 

can result in minor or moderate injuries in the event 

of noncompliance.

INFORMATION

Points out procedures in which there are 

no

 dangers 

of personal injuries or property damage.

WARNING

Warns of a potentially dangerous situation that can 

result in serious injuries or death in the event of 

noncompliance.

INFORMATION

 · The scope of delivery of the module includes 

the appropriate bus connector (JanBus 
interface) for connection to the base unit or 
additional modules!

 · In addition to the current measuring module, 

also observe the usage information for your 
base unit!

CAUTION

Non-observance of the assembly instructions 

may result in property damage or cause 

personal injury!

Noncompliance with the assembly instructions may 

cause damage to your base unit with modules or 

destroy it and may also result in personal injury.

 ·

Observe the assembly instructions of your 

base unit.

 ·

Before assembly of the modules:

 

-

Disconnect the system from the power 

supply! Secure it against being switched 

back on! Verify disconnection from power! 

Ground and short circuit! Cover or block off 

neighboring parts that are under voltage!

 ·

Ensure sufficient air circulation in your 

installation environment and, where applicable, 

sufficient cooling.

 ·

Return defective modules to the manufacturer.

DIN rail

1.

2.

Bus connector 

Module 800-CT8-A

UMG 801 (base unit)

Module 800-CT8-A

Bottom latch

Taking into consideration the assembly 
instructions for your base unit (check bus 
connection assembly, among other things!), 
assemble the modules when the system is 
disconnected from the power supply as follows:
1.  If not already done, insert the bus connector 

(JanBus interface) included in the respective 
scope of delivery in the socket on the bottom 
of your module.

2.  Press your module with bus connector onto 

the DIN rail until the bottom latches engages.

3.  Slide the contacts of your module bus connector 

into the sockets of the base unit bus connector 
(or in the sockets of the connected module) so 
that the bus connectors (devices) are linked.

Then wire your module and apply voltage to the 
base unit (system). The base unit recognizes the 
module automatically.

The base unit (UMG 801) 

 · with current measuring module measures current 

exclusively via a current transformer. The current 
transformers require basic insulation according to 
IEC 61010-1:2010 for the rated voltage of the circuit.

 · permits assembly of up to 10 modules.

ATTENTION

During the start-up process, the base unit does 

not recognize the module!

If there is no communication to the module, the 

module functions are not supported (current 

measurements).

 · Disconnect your system from the power supply 

and check the condition of the bus connector 

and the connection of the module to the base unit 

(JanBus interface). If necessary, slide the contacts 

of the module bus connector into the sockets of 

the base unit bus connector (or the connected 

module) so that the bus connectors (devices) are 

linked.

 · If necessary, restart the base unit.

 · If the specified measures are unsuccessful, please 

contact our support team - www.janitza.com

3.

Figure Assembly example:
UMG 801 (base unit) with module 800-CT8-A

Bus connector 

contacts

DIN rail

“Current measurement” with terminal assignment connection variant

UMG 801
(Basisgerät)

JanBus-Schnittstelle

S1

S2

S1

S2

S1

S2

9

10

11 12

13 14

I

5

I

6

I

7

S1

S2

15 16

I

8

S1

S2

S1

S2

S1

S2

1

2

3

4

5

6

I

1

I

2

I

3

S1

S2

7

8

I

4

S1

S2

Verbraucher

L1

L2

L3

N

S1

S2

S1

S2

S1

S2

Verbraucher

L1

L2

L3

N

S2

S1

S2

S1

S2

S1

S2

S1

JanBus-Schnittstelle

JanBus-Schnittstelle

Modul 800-CT8-A

Strommessung

Strommessung

4

ATTENTION

Improper handling may cause damage to the 

module and result in property damage!

The contacts of the bus connector (JanBus 

interface) can bend or break and destroy the bus 

connector!

 · Never touch or manipulate the contacts of the bus 

connector.

 · Never use force to press the module with bus 

connector contacts into the bus connector 

sockets!

 · When handling, transporting and storing the 

module, protect the contacts of the bus connector.

Bottom latch

Bottom latch

Bus connector 

sockets

Fig. “Base unit with module” assembly on DIN rail.

Fig. Module 800-CT8-A connection variant

Bus connector 

sockets

JanBus 

interface

JanBus inter-

face for additional 

modules

End angle

End angle

5

6

Current measurement

The 

module 800-CT8-A

 · measures current exclusively via a current transformer. 
 · permits connection of current transformers with 

secondary currents of ../1 and ../5 A for current 
measurement inputs I1 to I8 

 · has a current transformer ratio of 5/5 A as the 

standard setting (I1 to I8). 

 · does not measure DC currents.

WARNING

Risk of injury due to high currents and high 

electrical voltages!

Serious personal injuries or death can occur due 

to:

 · Touching live exposed or stripped cores.

 · Inputs of the devices, components and modules 

that are dangerous to touch.

Therefore, please observe the following for your 

system:

 ·

Before starting work, disconnect it from the 

power supply!

 ·

Secure it against being switched back on!

 ·

Verify disconnection from power!

 ·

Ground and short circuit! Use the ground 

connection points with the ground symbol for 

grounding! 

 ·

Cover or block off neighboring parts that are 

under voltage! 

WARNING

Electrical currents and voltages!

Open current transformers that are operated on the 

secondary side (high voltage spikes) can result in 

serious personal injuries or even death.

Avoid the open operation of the current trans-

formers and short-circuit unloaded transform-

ers.

INFORMATION

Recommendation:
The current transformer ratios are configured 
self-explanatorily in the “device configuration” 
function of the GridVis

®

 software.

Dismantling

Bus connector 

contacts

Screwdriver for 

unlatching

Bus connector 

sockets

Bottom latch

Bottom latch

ATTENTION

Handling your module too roughly may cause 

damage to the module and result in property 

damage!

The bus connector contacts and the bottom latches 

can be damaged or broken off during dismantling of 

your module.

 ·

Never wrench the module from the DIN rail 

using force.

 ·

Decouple the bus connector (JanBus interface) 

beforehand and carefully unlatch the bottom 

latch of the module using a screwdriver!

Dismantling the module:
1.  Disconnect the system from the power supply! 

Secure it against being switched back on! Verify 
disconnection from power! Ground and short 
circuit! Cover or block off neighboring parts that 
are under voltage!

2.  Disconnect the wiring of your module.
3.  Decouple the bus connector (JanBus interface) 

of your module from the base unit and/or the 
connected modules by pulling out your module.

4.  Unlatch all bottom latches of your module. 

Recommendation:

 Use a screwdriver for this 

(carefully!).

5.  Remove the DIN rail from your module without 

touching or damaging the bus connector 
contacts.

Bus 

connector 

sockets

JanBus 

interface

DIN rail

JanBus 

interface for 

additional 

modules

ATTENTION

Property damage due to dismantling or decoupling 

the module during operation!

Dismantling or decoupling the module while it is 

communicating with the base unit can lead to damage 

to your devices!

 ·

Disconnect your system from the power supply 

before dismantling or decoupling the module! 

Secure it against being turned back on! Verify 

disconnection from power! Ground and short 

circuit! Cover or block off neighboring parts that 

are under voltage!

Technical data

General information

Net weight 

(with plug terminals)

Approx. 220 g (0.49 lb)

Device dimensions

approx. w = 73 mm (2.87 in), 

h = 90 mm (3.54 in), 

d = 76 mm (2.99 in)

Installation position

discretionary

Mounting/assembly - 

suitable DIN rails -  

35 mm (1.38 in)

 · TS 35/7.5 according to EN 60715

 · TS 35/10

 · TS 35/15 x 1.5

Protection class

IP20

Operating temperature

-10 °C (14 °F) .. +55 °C (131 °F)

Impact resistance

IK07 according to IEC 62262

Current measurement

 

module 800-CT8-A

Rated current

5 A

Channels

8 (2x4)

 · 2 systems (L1, L2, L3, N)

 · Individual channels

Metering range

0 .. 6 Arms

Crest factor

2 (based on 6 Arms)

Overload for 1 s

120 A (sinusoidal)

Resolution

0.1 mA (color graphic display 0.01A)

Overvoltage category

300 V CATII

Rated surge voltage

2,5 kV

Power consumption

approx. 0.2 VA (Ri = 5 m

)

Sampling frequency

8.3 kHz

Frequency of the 
power frequency

40 Hz .. 70 Hz

Harmonics

1 .. 9. (only odd)

Transport and storage

The following information applies to devices which are  
transported and stored in the original packaging
Free fall

1 m (39.37 in)

Temperature

K55 

-25 °C (-13 °F) up to +70 °C (158 °F)

Relative humidity

5 to 95% at 25 °C (77 °F) 

without condensation

Ambient conditions during operation, see base unit

Interface and energy supply

JanBus (proprietary)

Via bus connector

Item no. 33.03.378

Fig.: Module 800-CT8-A

INFORMATION

 · Detailed technical data for the module 

can be found in the user manual.

 · Technical data for the base unit and 

information on the procedure in the event 
of errors can be found in the usage infor-
mation for your base unit.

Terminal connection capacity - Module 800-CT8-A

Connectable conductors. 

Only one conductor can be connected per terminal.
Single core, multi-core, 

fine-stranded

0.2 - 2.5 mm

2

, AWG 26-12

Cable end sleeve (not insulated)

 · recommended stripping length 

0.2 - 2.5 mm

2

, AWG 26-12

 · 10 mm (0.3937 in)

Cable end sleeve (insulated) *

 · recommended stripping 

length **

0.2 - 2.5 mm

2

, AWG 26-12

 · 12 mm

 

(≤1,5 mm

2

), 10 mm (>1.5 mm

2

) / 

0.47 in (≤1.5 mm

2

), 0.39 in (>1.5 mm

2

)

Cable end sleeve

Length of the contact sleeve ** 8 - 12 mm (0.31 - 0.47 in)
Tightening torque screw 

flange

0.2 Nm (1.77 lbf in)

...  Applies to wire end sleeves with a maximum outer diameter of the 

plastic collar up to 4.5 mm (0.18 in).

** 

..  Depending on the type of cable end sleeves used (cable end sleeve 

manufacturer).

General information

1

2

Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
Support tel. +49 6441 9642-22
E-mail: [email protected]
www.janitza.com

www

.janitza.com

Doc no. 2.053.007.1.g      Status: 11/2022

Current measuring module 

for the UMG 801

Installation instructions

 Module 800-CT8-A - current measuring module 5 A

Deutsche V

ersion:

siehe V

or

derseite

2

Safety

Safety instructions

The installation instructions do not include a 
complete list of all safety measures necessary for 
operating the device.
Special operating conditions may require 
additional measures. The installation instructions 
contain notes that must be observed for your 
personal safety and to prevent property damage.

Symbols used on the device:

The additional symbol on the 
device itself indicates an electrical 
danger that can result in serious 
injuries or death. 

The general warning symbol calls 
attention to possible risks of injury. 
Observe all the instructions listed 
under this symbol in order to 
prevent injuries or even death.

Safety measures

When operating electrical devices, specific parts 
of these devices and their components inevitably 
carry dangerous voltage. As a result, serious 
personal injuries or property damage can occur if 
they are not handled correctly:

•  Before connection, ground the device and its 

components at the ground wire connection, if 
available.

•  Dangerous voltages may be present in all 

circuit parts connected to the voltage supply.

•  There may still be dangerous voltages present 

in the device or the components even after 
disconnection of the supply voltage (capacitor 
storage).

•  Do not operate equipment with open current 

transformer circuits.

•  Do not exceed the threshold values specified 

in the user manual and on the rating 
plate. This must also be observed during 
inspections and commissioning.

•  Observe the safety instructions and 

warning notices in the usage information 
that accompanies the devices and their 
components!

Qualified personnel

To prevent personal injuries and property damage, 
only qualified personnel with electrical engineering 
training may work on the base unit and its 
components. They must also have knowledge

•  of the national accident prevention regulations.
•  of safety technology standards.
•  in the installation, commissioning and 

operation of the device and the components.

Intended use

The modules/components

•  are intended for 

industrial control usage

 only.

•  are intended as expansion or transfer modules 

for the UMG 801 base unit in switch cabinets 
and small distribution boards. (Please observe 
the usage information associated with the 
base unit).

•  may only be mounted to base units that are 

disconnected from the power supply (see 
“Assembly” step).

•  are not intended for installation in vehicles! 

Use of the base unit with modules in 
stationary equipment is considered an 
unusual environmental condition and is only 
permissible by special agreement.

•  are not intended for installation in areas 

exposed to harmful oils, acids, gases, vapors, 
dust and radiation, etc.

Disclaimer

Observing the usage information for the devices is 
a prerequisite for safe operation and for achieving the 
specified performance characteristics and product 
features. Janitza electronics GmbH assumes no 
liability for personal injuries, property damage and 
financial losses resulting from the failure to observe 
the usage information. Make sure that your usage 
information is legible and accessible.

Further usage information, such as e.g. the 
installation instructions or user manual for the 
base unit, can be found on our web site  
www.janitza.com under Support > Downloads.

Copyright notice

© 2019 - Janitza electronics GmbH - Lahnau.
All rights reserved. Any duplication, processing, 
distribution and any other kind of use, even in 
part, is prohibited.

Subject to technical changes.

•  Make sure that the installation instructions 

match your device.

•  Make sure you have first read and understood 

the usage information accompanying the 
product.

•  Keep the usage information accompanying 

the product accessible through its service life 
and hand it over to the subsequent owner 
where applicable.

•  Please refer to www.janitza.de for information 

concerning device revisions and the 
associated adjustments to the usage 
information accompanying the product.

 

Disposal

Please observe the national regulations. Dispose 
of individual parts, where necessary, depending 
on the properties and existing country-specific 
regulations, e.g. as:

•  Electronic waste
•  Batteries and accumulators
•  Plastic
•  Metals

or commission a certified 
disposal company with the scrapping.

Relevant laws, 
applied standards and directives

Please refer to the Declaration of Conformity 
on our web site (www.janitza.com) for the laws, 
standards and directives applied by Janitza 
electronics GmbH for the device.

3

7

WARNING

Risk of injury due to electric voltage or electrical 

current!

When handling electrical currents or voltages, 

serious personal injuries or death can occur due to:

 · Touching live exposed or stripped cores.

 · Device inputs that are dangerous to touch.

Before starting work on your system:

 ·

Disconnect it from the power supply!

 ·

Secure it against being switched back on!

 ·

Verify disconnection from power!

 ·

Ground and short circuit!

 ·

Cover or block off neighboring parts that are 

under voltage!

Incoming goods inspection

The prerequisites for trouble-free and safe 
operation of the devices and their components 
include proper transport, storage, setup and 
assembly, as well as careful operation and 
maintenance. 
Exercise caution when unpacking and packing 
the device, without using force and only using 
suitable tools.
Check:

•  Devices and components by performing 

a visual inspection to ensure a flawless 
mechanical condition. 

•  The scope of delivery (see user manual) for 

completeness before beginning the installation 
of your devices and components.

If you assume that safe operation is no longer 
possible, shut down your device with the 
components immediately and secure it from being 
unintentionally started back up again.

It can be assumed that safe operation is 
impossible if, for example, the device with 
components:

•  Has visible damage.
•  No longer functions despite an intact power 

supply.

•  Was subjected to extended periods of 

unfavorable conditions (e.g. storage outside 
of the permissible climate thresholds without 
adjustment to the room climate, condensation, 
etc.) or transport stress (e.g. falling from an 
elevated position, even without visible external 
damage, etc.).

User manual:

WARNING

Danger due to noncompliance with warning 

and safety instructions.

Noncompliance with warning and safety 

instructions on the device itself and in the 

information on using the device and its 

components can lead to injury or even death.

Observe safety instructions and warning notices 

on the device itself and in the usage information 

associated with the devices and their components, 

such as:

 · Installation instructions.

 · User manual.

 · Safety instructions supplement.

The current measuring module

 · enhances the scope of functions of the base 

unit with additional current measuring channels 
(2 blocks á 4 current measuring channels).

 · is suitable for current transformers with trans-

former ratios of ../1 A or ../5 A.

Device short description and assembly - current measuring module

Safety instructions in the installation instructions 
are highlighted with a warning triangle and are 
presented as follows depending on the level of risk:

ATTENTION

Warns of an imminently dangerous situation that 

can result in property damage or environmental 

damage in the event of noncompliance.

DANGER

Warns of an imminent danger that will result 

in serious or fatal injuries in the event of 

noncompliance.

CAUTION

Warns of an imminently dangerous situation that 

can result in minor or moderate injuries in the event 

of noncompliance.

INFORMATION

Points out procedures in which there are 

no

 dangers 

of personal injuries or property damage.

WARNING

Warns of a potentially dangerous situation that can 

result in serious injuries or death in the event of 

noncompliance.

INFORMATION

 · The scope of delivery of the module includes 

the appropriate bus connector (JanBus 
interface) for connection to the base unit or 
additional modules!

 · In addition to the current measuring module, 

also observe the usage information for your 
base unit!

CAUTION

Non-observance of the assembly instructions 

may result in property damage or cause 

personal injury!

Noncompliance with the assembly instructions may 

cause damage to your base unit with modules or 

destroy it and may also result in personal injury.

 ·

Observe the assembly instructions of your 

base unit.

 ·

Before assembly of the modules:

 

-

Disconnect the system from the power 

supply! Secure it against being switched 

back on! Verify disconnection from power! 

Ground and short circuit! Cover or block off 

neighboring parts that are under voltage!

 ·

Ensure sufficient air circulation in your 

installation environment and, where applicable, 

sufficient cooling.

 ·

Return defective modules to the manufacturer.

DIN rail

1.

2.

Bus connector 

Module 800-CT8-A

UMG 801 (base unit)

Module 800-CT8-A

Bottom latch

Taking into consideration the assembly 
instructions for your base unit (check bus 
connection assembly, among other things!), 
assemble the modules when the system is 
disconnected from the power supply as follows:
1.  If not already done, insert the bus connector 

(JanBus interface) included in the respective 
scope of delivery in the socket on the bottom 
of your module.

2.  Press your module with bus connector onto 

the DIN rail until the bottom latches engages.

3.  Slide the contacts of your module bus connector 

into the sockets of the base unit bus connector 
(or in the sockets of the connected module) so 
that the bus connectors (devices) are linked.

Then wire your module and apply voltage to the 
base unit (system). The base unit recognizes the 
module automatically.

The base unit (UMG 801) 

 · with current measuring module measures current 

exclusively via a current transformer. The current 
transformers require basic insulation according to 
IEC 61010-1:2010 for the rated voltage of the circuit.

 · permits assembly of up to 10 modules.

ATTENTION

During the start-up process, the base unit does 

not recognize the module!

If there is no communication to the module, the 

module functions are not supported (current 

measurements).

 · Disconnect your system from the power supply 

and check the condition of the bus connector 

and the connection of the module to the base unit 

(JanBus interface). If necessary, slide the contacts 

of the module bus connector into the sockets of 

the base unit bus connector (or the connected 

module) so that the bus connectors (devices) are 

linked.

 · If necessary, restart the base unit.

 · If the specified measures are unsuccessful, please 

contact our support team - www.janitza.com

3.

Figure Assembly example:
UMG 801 (base unit) with module 800-CT8-A

Bus connector 

contacts

DIN rail

“Current measurement” with terminal assignment connection variant

UMG 801
(Basisgerät)

JanBus-Schnittstelle

S1

S2

S1

S2

S1

S2

9

10

11 12

13 14

I

5

I

6

I

7

S1

S2

15 16

I

8

S1

S2

S1

S2

S1

S2

1

2

3

4

5

6

I

1

I

2

I

3

S1

S2

7

8

I

4

S1

S2

Verbraucher

L1

L2

L3

N

S1

S2

S1

S2

S1

S2

Verbraucher

L1

L2

L3

N

S2

S1

S2

S1

S2

S1

S2

S1

JanBus-Schnittstelle

JanBus-Schnittstelle

Modul 800-CT8-A

Strommessung

Strommessung

4

ATTENTION

Improper handling may cause damage to the 

module and result in property damage!

The contacts of the bus connector (JanBus 

interface) can bend or break and destroy the bus 

connector!

 · Never touch or manipulate the contacts of the bus 

connector.

 · Never use force to press the module with bus 

connector contacts into the bus connector 

sockets!

 · When handling, transporting and storing the 

module, protect the contacts of the bus connector.

Bottom latch

Bottom latch

Bus connector 

sockets

Fig. “Base unit with module” assembly on DIN rail.

Fig. Module 800-CT8-A connection variant

Bus connector 

sockets

JanBus 

interface

JanBus inter-

face for additional 

modules

End angle

End angle

5

6

Current measurement

The 

module 800-CT8-A

 · measures current exclusively via a current transformer. 
 · permits connection of current transformers with 

secondary currents of ../1 and ../5 A for current 
measurement inputs I1 to I8 

 · has a current transformer ratio of 5/5 A as the 

standard setting (I1 to I8). 

 · does not measure DC currents.

WARNING

Risk of injury due to high currents and high 

electrical voltages!

Serious personal injuries or death can occur due 

to:

 · Touching live exposed or stripped cores.

 · Inputs of the devices, components and modules 

that are dangerous to touch.

Therefore, please observe the following for your 

system:

 ·

Before starting work, disconnect it from the 

power supply!

 ·

Secure it against being switched back on!

 ·

Verify disconnection from power!

 ·

Ground and short circuit! Use the ground 

connection points with the ground symbol for 

grounding! 

 ·

Cover or block off neighboring parts that are 

under voltage! 

WARNING

Electrical currents and voltages!

Open current transformers that are operated on the 

secondary side (high voltage spikes) can result in 

serious personal injuries or even death.

Avoid the open operation of the current trans-

formers and short-circuit unloaded transform-

ers.

INFORMATION

Recommendation:
The current transformer ratios are configured 
self-explanatorily in the “device configuration” 
function of the GridVis

®

 software.

Dismantling

Bus connector 

contacts

Screwdriver for 

unlatching

Bus connector 

sockets

Bottom latch

Bottom latch

ATTENTION

Handling your module too roughly may cause 

damage to the module and result in property 

damage!

The bus connector contacts and the bottom latches 

can be damaged or broken off during dismantling of 

your module.

 ·

Never wrench the module from the DIN rail 

using force.

 ·

Decouple the bus connector (JanBus interface) 

beforehand and carefully unlatch the bottom 

latch of the module using a screwdriver!

Dismantling the module:
1.  Disconnect the system from the power supply! 

Secure it against being switched back on! Verify 
disconnection from power! Ground and short 
circuit! Cover or block off neighboring parts that 
are under voltage!

2.  Disconnect the wiring of your module.
3.  Decouple the bus connector (JanBus interface) 

of your module from the base unit and/or the 
connected modules by pulling out your module.

4.  Unlatch all bottom latches of your module. 

Recommendation:

 Use a screwdriver for this 

(carefully!).

5.  Remove the DIN rail from your module without 

touching or damaging the bus connector 
contacts.

Bus 

connector 

sockets

JanBus 

interface

DIN rail

JanBus 

interface for 

additional 

modules

ATTENTION

Property damage due to dismantling or decoupling 

the module during operation!

Dismantling or decoupling the module while it is 

communicating with the base unit can lead to damage 

to your devices!

 ·

Disconnect your system from the power supply 

before dismantling or decoupling the module! 

Secure it against being turned back on! Verify 

disconnection from power! Ground and short 

circuit! Cover or block off neighboring parts that 

are under voltage!

Technical data

General information

Net weight 

(with plug terminals)

Approx. 220 g (0.49 lb)

Device dimensions

approx. w = 73 mm (2.87 in), 

h = 90 mm (3.54 in), 

d = 76 mm (2.99 in)

Installation position

discretionary

Mounting/assembly - 

suitable DIN rails -  

35 mm (1.38 in)

 · TS 35/7.5 according to EN 60715

 · TS 35/10

 · TS 35/15 x 1.5

Protection class

IP20

Operating temperature

-10 °C (14 °F) .. +55 °C (131 °F)

Impact resistance

IK07 according to IEC 62262

Current measurement

 

module 800-CT8-A

Rated current

5 A

Channels

8 (2x4)

 · 2 systems (L1, L2, L3, N)

 · Individual channels

Metering range

0 .. 6 Arms

Crest factor

2 (based on 6 Arms)

Overload for 1 s

120 A (sinusoidal)

Resolution

0.1 mA (color graphic display 0.01A)

Overvoltage category

300 V CATII

Rated surge voltage

2,5 kV

Power consumption

approx. 0.2 VA (Ri = 5 m

)

Sampling frequency

8.3 kHz

Frequency of the 
power frequency

40 Hz .. 70 Hz

Harmonics

1 .. 9. (only odd)

Transport and storage

The following information applies to devices which are  
transported and stored in the original packaging
Free fall

1 m (39.37 in)

Temperature

K55 

-25 °C (-13 °F) up to +70 °C (158 °F)

Relative humidity

5 to 95% at 25 °C (77 °F) 

without condensation

Ambient conditions during operation, see base unit

Interface and energy supply

JanBus (proprietary)

Via bus connector

Item no. 33.03.378

Fig.: Module 800-CT8-A

INFORMATION

 · Detailed technical data for the module 

can be found in the user manual.

 · Technical data for the base unit and 

information on the procedure in the event 
of errors can be found in the usage infor-
mation for your base unit.

Terminal connection capacity - Module 800-CT8-A

Connectable conductors. 

Only one conductor can be connected per terminal.
Single core, multi-core, 

fine-stranded

0.2 - 2.5 mm

2

, AWG 26-12

Cable end sleeve (not insulated)

 · recommended stripping length 

0.2 - 2.5 mm

2

, AWG 26-12

 · 10 mm (0.3937 in)

Cable end sleeve (insulated) *

 · recommended stripping 

length **

0.2 - 2.5 mm

2

, AWG 26-12

 · 12 mm

 

(≤1,5 mm

2

), 10 mm (>1.5 mm

2

) / 

0.47 in (≤1.5 mm

2

), 0.39 in (>1.5 mm

2

)

Cable end sleeve

Length of the contact sleeve ** 8 - 12 mm (0.31 - 0.47 in)
Tightening torque screw 

flange

0.2 Nm (1.77 lbf in)

...  Applies to wire end sleeves with a maximum outer diameter of the 

plastic collar up to 4.5 mm (0.18 in).

** 

..  Depending on the type of cable end sleeves used (cable end sleeve 

manufacturer).

General information

1

2

Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
Support tel. +49 6441 9642-22
E-mail: [email protected]
www.janitza.com

www

.janitza.com

Doc no. 2.053.007.1.g      Status: 11/2022

Current measuring module 

for the UMG 801

Installation instructions

 Module 800-CT8-A - current measuring module 5 A

Deutsche V

ersion:

siehe V

or

derseite

2

Safety

Safety instructions

The installation instructions do not include a 
complete list of all safety measures necessary for 
operating the device.
Special operating conditions may require 
additional measures. The installation instructions 
contain notes that must be observed for your 
personal safety and to prevent property damage.

Symbols used on the device:

The additional symbol on the 
device itself indicates an electrical 
danger that can result in serious 
injuries or death. 

The general warning symbol calls 
attention to possible risks of injury. 
Observe all the instructions listed 
under this symbol in order to 
prevent injuries or even death.

Safety measures

When operating electrical devices, specific parts 
of these devices and their components inevitably 
carry dangerous voltage. As a result, serious 
personal injuries or property damage can occur if 
they are not handled correctly:

•  Before connection, ground the device and its 

components at the ground wire connection, if 
available.

•  Dangerous voltages may be present in all 

circuit parts connected to the voltage supply.

•  There may still be dangerous voltages present 

in the device or the components even after 
disconnection of the supply voltage (capacitor 
storage).

•  Do not operate equipment with open current 

transformer circuits.

•  Do not exceed the threshold values specified 

in the user manual and on the rating 
plate. This must also be observed during 
inspections and commissioning.

•  Observe the safety instructions and 

warning notices in the usage information 
that accompanies the devices and their 
components!

Qualified personnel

To prevent personal injuries and property damage, 
only qualified personnel with electrical engineering 
training may work on the base unit and its 
components. They must also have knowledge

•  of the national accident prevention regulations.
•  of safety technology standards.
•  in the installation, commissioning and 

operation of the device and the components.

Intended use

The modules/components

•  are intended for 

industrial control usage

 only.

•  are intended as expansion or transfer modules 

for the UMG 801 base unit in switch cabinets 
and small distribution boards. (Please observe 
the usage information associated with the 
base unit).

•  may only be mounted to base units that are 

disconnected from the power supply (see 
“Assembly” step).

•  are not intended for installation in vehicles! 

Use of the base unit with modules in 
stationary equipment is considered an 
unusual environmental condition and is only 
permissible by special agreement.

•  are not intended for installation in areas 

exposed to harmful oils, acids, gases, vapors, 
dust and radiation, etc.

Disclaimer

Observing the usage information for the devices is 
a prerequisite for safe operation and for achieving the 
specified performance characteristics and product 
features. Janitza electronics GmbH assumes no 
liability for personal injuries, property damage and 
financial losses resulting from the failure to observe 
the usage information. Make sure that your usage 
information is legible and accessible.

Further usage information, such as e.g. the 
installation instructions or user manual for the 
base unit, can be found on our web site  
www.janitza.com under Support > Downloads.

Copyright notice

© 2019 - Janitza electronics GmbH - Lahnau.
All rights reserved. Any duplication, processing, 
distribution and any other kind of use, even in 
part, is prohibited.

Subject to technical changes.

•  Make sure that the installation instructions 

match your device.

•  Make sure you have first read and understood 

the usage information accompanying the 
product.

•  Keep the usage information accompanying 

the product accessible through its service life 
and hand it over to the subsequent owner 
where applicable.

•  Please refer to www.janitza.de for information 

concerning device revisions and the 
associated adjustments to the usage 
information accompanying the product.

 

Disposal

Please observe the national regulations. Dispose 
of individual parts, where necessary, depending 
on the properties and existing country-specific 
regulations, e.g. as:

•  Electronic waste
•  Batteries and accumulators
•  Plastic
•  Metals

or commission a certified 
disposal company with the scrapping.

Relevant laws, 
applied standards and directives

Please refer to the Declaration of Conformity 
on our web site (www.janitza.com) for the laws, 
standards and directives applied by Janitza 
electronics GmbH for the device.

3

7

WARNING

Risk of injury due to electric voltage or electrical 

current!

When handling electrical currents or voltages, 

serious personal injuries or death can occur due to:

 · Touching live exposed or stripped cores.

 · Device inputs that are dangerous to touch.

Before starting work on your system:

 ·

Disconnect it from the power supply!

 ·

Secure it against being switched back on!

 ·

Verify disconnection from power!

 ·

Ground and short circuit!

 ·

Cover or block off neighboring parts that are 

under voltage!

Incoming goods inspection

The prerequisites for trouble-free and safe 
operation of the devices and their components 
include proper transport, storage, setup and 
assembly, as well as careful operation and 
maintenance. 
Exercise caution when unpacking and packing 
the device, without using force and only using 
suitable tools.
Check:

•  Devices and components by performing 

a visual inspection to ensure a flawless 
mechanical condition. 

•  The scope of delivery (see user manual) for 

completeness before beginning the installation 
of your devices and components.

If you assume that safe operation is no longer 
possible, shut down your device with the 
components immediately and secure it from being 
unintentionally started back up again.

It can be assumed that safe operation is 
impossible if, for example, the device with 
components:

•  Has visible damage.
•  No longer functions despite an intact power 

supply.

•  Was subjected to extended periods of 

unfavorable conditions (e.g. storage outside 
of the permissible climate thresholds without 
adjustment to the room climate, condensation, 
etc.) or transport stress (e.g. falling from an 
elevated position, even without visible external 
damage, etc.).

User manual:

WARNING

Danger due to noncompliance with warning 

and safety instructions.

Noncompliance with warning and safety 

instructions on the device itself and in the 

information on using the device and its 

components can lead to injury or even death.

Observe safety instructions and warning notices 

on the device itself and in the usage information 

associated with the devices and their components, 

such as:

 · Installation instructions.

 · User manual.

 · Safety instructions supplement.

The current measuring module

 · enhances the scope of functions of the base 

unit with additional current measuring channels 
(2 blocks á 4 current measuring channels).

 · is suitable for current transformers with trans-

former ratios of ../1 A or ../5 A.

Device short description and assembly - current measuring module

Safety instructions in the installation instructions 
are highlighted with a warning triangle and are 
presented as follows depending on the level of risk:

ATTENTION

Warns of an imminently dangerous situation that 

can result in property damage or environmental 

damage in the event of noncompliance.

DANGER

Warns of an imminent danger that will result 

in serious or fatal injuries in the event of 

noncompliance.

CAUTION

Warns of an imminently dangerous situation that 

can result in minor or moderate injuries in the event 

of noncompliance.

INFORMATION

Points out procedures in which there are 

no

 dangers 

of personal injuries or property damage.

WARNING

Warns of a potentially dangerous situation that can 

result in serious injuries or death in the event of 

noncompliance.

INFORMATION

 · The scope of delivery of the module includes 

the appropriate bus connector (JanBus 
interface) for connection to the base unit or 
additional modules!

 · In addition to the current measuring module, 

also observe the usage information for your 
base unit!

CAUTION

Non-observance of the assembly instructions 

may result in property damage or cause 

personal injury!

Noncompliance with the assembly instructions may 

cause damage to your base unit with modules or 

destroy it and may also result in personal injury.

 ·

Observe the assembly instructions of your 

base unit.

 ·

Before assembly of the modules:

 

-

Disconnect the system from the power 

supply! Secure it against being switched 

back on! Verify disconnection from power! 

Ground and short circuit! Cover or block off 

neighboring parts that are under voltage!

 ·

Ensure sufficient air circulation in your 

installation environment and, where applicable, 

sufficient cooling.

 ·

Return defective modules to the manufacturer.

DIN rail

1.

2.

Bus connector 

Module 800-CT8-A

UMG 801 (base unit)

Module 800-CT8-A

Bottom latch

Taking into consideration the assembly 
instructions for your base unit (check bus 
connection assembly, among other things!), 
assemble the modules when the system is 
disconnected from the power supply as follows:
1.  If not already done, insert the bus connector 

(JanBus interface) included in the respective 
scope of delivery in the socket on the bottom 
of your module.

2.  Press your module with bus connector onto 

the DIN rail until the bottom latches engages.

3.  Slide the contacts of your module bus connector 

into the sockets of the base unit bus connector 
(or in the sockets of the connected module) so 
that the bus connectors (devices) are linked.

Then wire your module and apply voltage to the 
base unit (system). The base unit recognizes the 
module automatically.

The base unit (UMG 801) 

 · with current measuring module measures current 

exclusively via a current transformer. The current 
transformers require basic insulation according to 
IEC 61010-1:2010 for the rated voltage of the circuit.

 · permits assembly of up to 10 modules.

ATTENTION

During the start-up process, the base unit does 

not recognize the module!

If there is no communication to the module, the 

module functions are not supported (current 

measurements).

 · Disconnect your system from the power supply 

and check the condition of the bus connector 

and the connection of the module to the base unit 

(JanBus interface). If necessary, slide the contacts 

of the module bus connector into the sockets of 

the base unit bus connector (or the connected 

module) so that the bus connectors (devices) are 

linked.

 · If necessary, restart the base unit.

 · If the specified measures are unsuccessful, please 

contact our support team - www.janitza.com

3.

Figure Assembly example:
UMG 801 (base unit) with module 800-CT8-A

Bus connector 

contacts

DIN rail

“Current measurement” with terminal assignment connection variant

UMG 801
(Basisgerät)

JanBus-Schnittstelle

S1

S2

S1

S2

S1

S2

9

10

11 12

13 14

I

5

I

6

I

7

S1

S2

15 16

I

8

S1

S2

S1

S2

S1

S2

1

2

3

4

5

6

I

1

I

2

I

3

S1

S2

7

8

I

4

S1

S2

Verbraucher

L1

L2

L3

N

S1

S2

S1

S2

S1

S2

Verbraucher

L1

L2

L3

N

S2

S1

S2

S1

S2

S1

S2

S1

JanBus-Schnittstelle

JanBus-Schnittstelle

Modul 800-CT8-A

Strommessung

Strommessung

4

ATTENTION

Improper handling may cause damage to the 

module and result in property damage!

The contacts of the bus connector (JanBus 

interface) can bend or break and destroy the bus 

connector!

 · Never touch or manipulate the contacts of the bus 

connector.

 · Never use force to press the module with bus 

connector contacts into the bus connector 

sockets!

 · When handling, transporting and storing the 

module, protect the contacts of the bus connector.

Bottom latch

Bottom latch

Bus connector 

sockets

Fig. “Base unit with module” assembly on DIN rail.

Fig. Module 800-CT8-A connection variant

Bus connector 

sockets

JanBus 

interface

JanBus inter-

face for additional 

modules

End angle

End angle

5

6

Current measurement

The 

module 800-CT8-A

 · measures current exclusively via a current transformer. 
 · permits connection of current transformers with 

secondary currents of ../1 and ../5 A for current 
measurement inputs I1 to I8 

 · has a current transformer ratio of 5/5 A as the 

standard setting (I1 to I8). 

 · does not measure DC currents.

WARNING

Risk of injury due to high currents and high 

electrical voltages!

Serious personal injuries or death can occur due 

to:

 · Touching live exposed or stripped cores.

 · Inputs of the devices, components and modules 

that are dangerous to touch.

Therefore, please observe the following for your 

system:

 ·

Before starting work, disconnect it from the 

power supply!

 ·

Secure it against being switched back on!

 ·

Verify disconnection from power!

 ·

Ground and short circuit! Use the ground 

connection points with the ground symbol for 

grounding! 

 ·

Cover or block off neighboring parts that are 

under voltage! 

WARNING

Electrical currents and voltages!

Open current transformers that are operated on the 

secondary side (high voltage spikes) can result in 

serious personal injuries or even death.

Avoid the open operation of the current trans-

formers and short-circuit unloaded transform-

ers.

INFORMATION

Recommendation:
The current transformer ratios are configured 
self-explanatorily in the “device configuration” 
function of the GridVis

®

 software.

Dismantling

Bus connector 

contacts

Screwdriver for 

unlatching

Bus connector 

sockets

Bottom latch

Bottom latch

ATTENTION

Handling your module too roughly may cause 

damage to the module and result in property 

damage!

The bus connector contacts and the bottom latches 

can be damaged or broken off during dismantling of 

your module.

 ·

Never wrench the module from the DIN rail 

using force.

 ·

Decouple the bus connector (JanBus interface) 

beforehand and carefully unlatch the bottom 

latch of the module using a screwdriver!

Dismantling the module:
1.  Disconnect the system from the power supply! 

Secure it against being switched back on! Verify 
disconnection from power! Ground and short 
circuit! Cover or block off neighboring parts that 
are under voltage!

2.  Disconnect the wiring of your module.
3.  Decouple the bus connector (JanBus interface) 

of your module from the base unit and/or the 
connected modules by pulling out your module.

4.  Unlatch all bottom latches of your module. 

Recommendation:

 Use a screwdriver for this 

(carefully!).

5.  Remove the DIN rail from your module without 

touching or damaging the bus connector 
contacts.

Bus 

connector 

sockets

JanBus 

interface

DIN rail

JanBus 

interface for 

additional 

modules

ATTENTION

Property damage due to dismantling or decoupling 

the module during operation!

Dismantling or decoupling the module while it is 

communicating with the base unit can lead to damage 

to your devices!

 ·

Disconnect your system from the power supply 

before dismantling or decoupling the module! 

Secure it against being turned back on! Verify 

disconnection from power! Ground and short 

circuit! Cover or block off neighboring parts that 

are under voltage!

Technical data

General information

Net weight 

(with plug terminals)

Approx. 220 g (0.49 lb)

Device dimensions

approx. w = 73 mm (2.87 in), 

h = 90 mm (3.54 in), 

d = 76 mm (2.99 in)

Installation position

discretionary

Mounting/assembly - 

suitable DIN rails -  

35 mm (1.38 in)

 · TS 35/7.5 according to EN 60715

 · TS 35/10

 · TS 35/15 x 1.5

Protection class

IP20

Operating temperature

-10 °C (14 °F) .. +55 °C (131 °F)

Impact resistance

IK07 according to IEC 62262

Current measurement

 

module 800-CT8-A

Rated current

5 A

Channels

8 (2x4)

 · 2 systems (L1, L2, L3, N)

 · Individual channels

Metering range

0 .. 6 Arms

Crest factor

2 (based on 6 Arms)

Overload for 1 s

120 A (sinusoidal)

Resolution

0.1 mA (color graphic display 0.01A)

Overvoltage category

300 V CATII

Rated surge voltage

2,5 kV

Power consumption

approx. 0.2 VA (Ri = 5 m

)

Sampling frequency

8.3 kHz

Frequency of the 
power frequency

40 Hz .. 70 Hz

Harmonics

1 .. 9. (only odd)

Transport and storage

The following information applies to devices which are  
transported and stored in the original packaging
Free fall

1 m (39.37 in)

Temperature

K55 

-25 °C (-13 °F) up to +70 °C (158 °F)

Relative humidity

5 to 95% at 25 °C (77 °F) 

without condensation

Ambient conditions during operation, see base unit

Interface and energy supply

JanBus (proprietary)

Via bus connector

Item no. 33.03.378

Fig.: Module 800-CT8-A

INFORMATION

 · Detailed technical data for the module 

can be found in the user manual.

 · Technical data for the base unit and 

information on the procedure in the event 
of errors can be found in the usage infor-
mation for your base unit.

Terminal connection capacity - Module 800-CT8-A

Connectable conductors. 

Only one conductor can be connected per terminal.
Single core, multi-core, 

fine-stranded

0.2 - 2.5 mm

2

, AWG 26-12

Cable end sleeve (not insulated)

 · recommended stripping length 

0.2 - 2.5 mm

2

, AWG 26-12

 · 10 mm (0.3937 in)

Cable end sleeve (insulated) *

 · recommended stripping 

length **

0.2 - 2.5 mm

2

, AWG 26-12

 · 12 mm

 

(≤1,5 mm

2

), 10 mm (>1.5 mm

2

) / 

0.47 in (≤1.5 mm

2

), 0.39 in (>1.5 mm

2

)

Cable end sleeve

Length of the contact sleeve ** 8 - 12 mm (0.31 - 0.47 in)
Tightening torque screw 

flange

0.2 Nm (1.77 lbf in)

...  Applies to wire end sleeves with a maximum outer diameter of the 

plastic collar up to 4.5 mm (0.18 in).

** 

..  Depending on the type of cable end sleeves used (cable end sleeve 

manufacturer).

General information

1

2

Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
Support tel. +49 6441 9642-22
E-mail: [email protected]
www.janitza.com

www

.janitza.com

Doc no. 2.053.007.1.g      Status: 11/2022

Current measuring module 

for the UMG 801

Installation instructions

 Module 800-CT8-A - current measuring module 5 A

Deutsche V

ersion:

siehe V

or

derseite

2

Safety

Safety instructions

The installation instructions do not include a 
complete list of all safety measures necessary for 
operating the device.
Special operating conditions may require 
additional measures. The installation instructions 
contain notes that must be observed for your 
personal safety and to prevent property damage.

Symbols used on the device:

The additional symbol on the 
device itself indicates an electrical 
danger that can result in serious 
injuries or death. 

The general warning symbol calls 
attention to possible risks of injury. 
Observe all the instructions listed 
under this symbol in order to 
prevent injuries or even death.

Safety measures

When operating electrical devices, specific parts 
of these devices and their components inevitably 
carry dangerous voltage. As a result, serious 
personal injuries or property damage can occur if 
they are not handled correctly:

•  Before connection, ground the device and its 

components at the ground wire connection, if 
available.

•  Dangerous voltages may be present in all 

circuit parts connected to the voltage supply.

•  There may still be dangerous voltages present 

in the device or the components even after 
disconnection of the supply voltage (capacitor 
storage).

•  Do not operate equipment with open current 

transformer circuits.

•  Do not exceed the threshold values specified 

in the user manual and on the rating 
plate. This must also be observed during 
inspections and commissioning.

•  Observe the safety instructions and 

warning notices in the usage information 
that accompanies the devices and their 
components!

Qualified personnel

To prevent personal injuries and property damage, 
only qualified personnel with electrical engineering 
training may work on the base unit and its 
components. They must also have knowledge

•  of the national accident prevention regulations.
•  of safety technology standards.
•  in the installation, commissioning and 

operation of the device and the components.

Intended use

The modules/components

•  are intended for 

industrial control usage

 only.

•  are intended as expansion or transfer modules 

for the UMG 801 base unit in switch cabinets 
and small distribution boards. (Please observe 
the usage information associated with the 
base unit).

•  may only be mounted to base units that are 

disconnected from the power supply (see 
“Assembly” step).

•  are not intended for installation in vehicles! 

Use of the base unit with modules in 
stationary equipment is considered an 
unusual environmental condition and is only 
permissible by special agreement.

•  are not intended for installation in areas 

exposed to harmful oils, acids, gases, vapors, 
dust and radiation, etc.

Disclaimer

Observing the usage information for the devices is 
a prerequisite for safe operation and for achieving the 
specified performance characteristics and product 
features. Janitza electronics GmbH assumes no 
liability for personal injuries, property damage and 
financial losses resulting from the failure to observe 
the usage information. Make sure that your usage 
information is legible and accessible.

Further usage information, such as e.g. the 
installation instructions or user manual for the 
base unit, can be found on our web site  
www.janitza.com under Support > Downloads.

Copyright notice

© 2019 - Janitza electronics GmbH - Lahnau.
All rights reserved. Any duplication, processing, 
distribution and any other kind of use, even in 
part, is prohibited.

Subject to technical changes.

•  Make sure that the installation instructions 

match your device.

•  Make sure you have first read and understood 

the usage information accompanying the 
product.

•  Keep the usage information accompanying 

the product accessible through its service life 
and hand it over to the subsequent owner 
where applicable.

•  Please refer to www.janitza.de for information 

concerning device revisions and the 
associated adjustments to the usage 
information accompanying the product.

 

Disposal

Please observe the national regulations. Dispose 
of individual parts, where necessary, depending 
on the properties and existing country-specific 
regulations, e.g. as:

•  Electronic waste
•  Batteries and accumulators
•  Plastic
•  Metals

or commission a certified 
disposal company with the scrapping.

Relevant laws, 
applied standards and directives

Please refer to the Declaration of Conformity 
on our web site (www.janitza.com) for the laws, 
standards and directives applied by Janitza 
electronics GmbH for the device.

3

7

WARNING

Risk of injury due to electric voltage or electrical 

current!

When handling electrical currents or voltages, 

serious personal injuries or death can occur due to:

 · Touching live exposed or stripped cores.

 · Device inputs that are dangerous to touch.

Before starting work on your system:

 ·

Disconnect it from the power supply!

 ·

Secure it against being switched back on!

 ·

Verify disconnection from power!

 ·

Ground and short circuit!

 ·

Cover or block off neighboring parts that are 

under voltage!

Incoming goods inspection

The prerequisites for trouble-free and safe 
operation of the devices and their components 
include proper transport, storage, setup and 
assembly, as well as careful operation and 
maintenance. 
Exercise caution when unpacking and packing 
the device, without using force and only using 
suitable tools.
Check:

•  Devices and components by performing 

a visual inspection to ensure a flawless 
mechanical condition. 

•  The scope of delivery (see user manual) for 

completeness before beginning the installation 
of your devices and components.

If you assume that safe operation is no longer 
possible, shut down your device with the 
components immediately and secure it from being 
unintentionally started back up again.

It can be assumed that safe operation is 
impossible if, for example, the device with 
components:

•  Has visible damage.
•  No longer functions despite an intact power 

supply.

•  Was subjected to extended periods of 

unfavorable conditions (e.g. storage outside 
of the permissible climate thresholds without 
adjustment to the room climate, condensation, 
etc.) or transport stress (e.g. falling from an 
elevated position, even without visible external 
damage, etc.).

User manual:

WARNING

Danger due to noncompliance with warning 

and safety instructions.

Noncompliance with warning and safety 

instructions on the device itself and in the 

information on using the device and its 

components can lead to injury or even death.

Observe safety instructions and warning notices 

on the device itself and in the usage information 

associated with the devices and their components, 

such as:

 · Installation instructions.

 · User manual.

 · Safety instructions supplement.

The current measuring module

 · enhances the scope of functions of the base 

unit with additional current measuring channels 
(2 blocks á 4 current measuring channels).

 · is suitable for current transformers with trans-

former ratios of ../1 A or ../5 A.

Device short description and assembly - current measuring module

Safety instructions in the installation instructions 
are highlighted with a warning triangle and are 
presented as follows depending on the level of risk:

ATTENTION

Warns of an imminently dangerous situation that 

can result in property damage or environmental 

damage in the event of noncompliance.

DANGER

Warns of an imminent danger that will result 

in serious or fatal injuries in the event of 

noncompliance.

CAUTION

Warns of an imminently dangerous situation that 

can result in minor or moderate injuries in the event 

of noncompliance.

INFORMATION

Points out procedures in which there are 

no

 dangers 

of personal injuries or property damage.

WARNING

Warns of a potentially dangerous situation that can 

result in serious injuries or death in the event of 

noncompliance.

INFORMATION

 · The scope of delivery of the module includes 

the appropriate bus connector (JanBus 
interface) for connection to the base unit or 
additional modules!

 · In addition to the current measuring module, 

also observe the usage information for your 
base unit!

CAUTION

Non-observance of the assembly instructions 

may result in property damage or cause 

personal injury!

Noncompliance with the assembly instructions may 

cause damage to your base unit with modules or 

destroy it and may also result in personal injury.

 ·

Observe the assembly instructions of your 

base unit.

 ·

Before assembly of the modules:

 

-

Disconnect the system from the power 

supply! Secure it against being switched 

back on! Verify disconnection from power! 

Ground and short circuit! Cover or block off 

neighboring parts that are under voltage!

 ·

Ensure sufficient air circulation in your 

installation environment and, where applicable, 

sufficient cooling.

 ·

Return defective modules to the manufacturer.

DIN rail

1.

2.

Bus connector 

Module 800-CT8-A

UMG 801 (base unit)

Module 800-CT8-A

Bottom latch

Taking into consideration the assembly 
instructions for your base unit (check bus 
connection assembly, among other things!), 
assemble the modules when the system is 
disconnected from the power supply as follows:
1.  If not already done, insert the bus connector 

(JanBus interface) included in the respective 
scope of delivery in the socket on the bottom 
of your module.

2.  Press your module with bus connector onto 

the DIN rail until the bottom latches engages.

3.  Slide the contacts of your module bus connector 

into the sockets of the base unit bus connector 
(or in the sockets of the connected module) so 
that the bus connectors (devices) are linked.

Then wire your module and apply voltage to the 
base unit (system). The base unit recognizes the 
module automatically.

The base unit (UMG 801) 

 · with current measuring module measures current 

exclusively via a current transformer. The current 
transformers require basic insulation according to 
IEC 61010-1:2010 for the rated voltage of the circuit.

 · permits assembly of up to 10 modules.

ATTENTION

During the start-up process, the base unit does 

not recognize the module!

If there is no communication to the module, the 

module functions are not supported (current 

measurements).

 · Disconnect your system from the power supply 

and check the condition of the bus connector 

and the connection of the module to the base unit 

(JanBus interface). If necessary, slide the contacts 

of the module bus connector into the sockets of 

the base unit bus connector (or the connected 

module) so that the bus connectors (devices) are 

linked.

 · If necessary, restart the base unit.

 · If the specified measures are unsuccessful, please 

contact our support team - www.janitza.com

3.

Figure Assembly example:
UMG 801 (base unit) with module 800-CT8-A

Bus connector 

contacts

DIN rail

“Current measurement” with terminal assignment connection variant

UMG 801
(Basisgerät)

JanBus-Schnittstelle

S1

S2

S1

S2

S1

S2

9

10

11 12

13 14

I

5

I

6

I

7

S1

S2

15 16

I

8

S1

S2

S1

S2

S1

S2

1

2

3

4

5

6

I

1

I

2

I

3

S1

S2

7

8

I

4

S1

S2

Verbraucher

L1

L2

L3

N

S1

S2

S1

S2

S1

S2

Verbraucher

L1

L2

L3

N

S2

S1

S2

S1

S2

S1

S2

S1

JanBus-Schnittstelle

JanBus-Schnittstelle

Modul 800-CT8-A

Strommessung

Strommessung

4

ATTENTION

Improper handling may cause damage to the 

module and result in property damage!

The contacts of the bus connector (JanBus 

interface) can bend or break and destroy the bus 

connector!

 · Never touch or manipulate the contacts of the bus 

connector.

 · Never use force to press the module with bus 

connector contacts into the bus connector 

sockets!

 · When handling, transporting and storing the 

module, protect the contacts of the bus connector.

Bottom latch

Bottom latch

Bus connector 

sockets

Fig. “Base unit with module” assembly on DIN rail.

Fig. Module 800-CT8-A connection variant

Bus connector 

sockets

JanBus 

interface

JanBus inter-

face for additional 

modules

End angle

End angle

5

6

Current measurement

The 

module 800-CT8-A

 · measures current exclusively via a current transformer. 
 · permits connection of current transformers with 

secondary currents of ../1 and ../5 A for current 
measurement inputs I1 to I8 

 · has a current transformer ratio of 5/5 A as the 

standard setting (I1 to I8). 

 · does not measure DC currents.

WARNING

Risk of injury due to high currents and high 

electrical voltages!

Serious personal injuries or death can occur due 

to:

 · Touching live exposed or stripped cores.

 · Inputs of the devices, components and modules 

that are dangerous to touch.

Therefore, please observe the following for your 

system:

 ·

Before starting work, disconnect it from the 

power supply!

 ·

Secure it against being switched back on!

 ·

Verify disconnection from power!

 ·

Ground and short circuit! Use the ground 

connection points with the ground symbol for 

grounding! 

 ·

Cover or block off neighboring parts that are 

under voltage! 

WARNING

Electrical currents and voltages!

Open current transformers that are operated on the 

secondary side (high voltage spikes) can result in 

serious personal injuries or even death.

Avoid the open operation of the current trans-

formers and short-circuit unloaded transform-

ers.

INFORMATION

Recommendation:
The current transformer ratios are configured 
self-explanatorily in the “device configuration” 
function of the GridVis

®

 software.

Dismantling

Bus connector 

contacts

Screwdriver for 

unlatching

Bus connector 

sockets

Bottom latch

Bottom latch

ATTENTION

Handling your module too roughly may cause 

damage to the module and result in property 

damage!

The bus connector contacts and the bottom latches 

can be damaged or broken off during dismantling of 

your module.

 ·

Never wrench the module from the DIN rail 

using force.

 ·

Decouple the bus connector (JanBus interface) 

beforehand and carefully unlatch the bottom 

latch of the module using a screwdriver!

Dismantling the module:
1.  Disconnect the system from the power supply! 

Secure it against being switched back on! Verify 
disconnection from power! Ground and short 
circuit! Cover or block off neighboring parts that 
are under voltage!

2.  Disconnect the wiring of your module.
3.  Decouple the bus connector (JanBus interface) 

of your module from the base unit and/or the 
connected modules by pulling out your module.

4.  Unlatch all bottom latches of your module. 

Recommendation:

 Use a screwdriver for this 

(carefully!).

5.  Remove the DIN rail from your module without 

touching or damaging the bus connector 
contacts.

Bus 

connector 

sockets

JanBus 

interface

DIN rail

JanBus 

interface for 

additional 

modules

ATTENTION

Property damage due to dismantling or decoupling 

the module during operation!

Dismantling or decoupling the module while it is 

communicating with the base unit can lead to damage 

to your devices!

 ·

Disconnect your system from the power supply 

before dismantling or decoupling the module! 

Secure it against being turned back on! Verify 

disconnection from power! Ground and short 

circuit! Cover or block off neighboring parts that 

are under voltage!

Technical data

General information

Net weight 

(with plug terminals)

Approx. 220 g (0.49 lb)

Device dimensions

approx. w = 73 mm (2.87 in), 

h = 90 mm (3.54 in), 

d = 76 mm (2.99 in)

Installation position

discretionary

Mounting/assembly - 

suitable DIN rails -  

35 mm (1.38 in)

 · TS 35/7.5 according to EN 60715

 · TS 35/10

 · TS 35/15 x 1.5

Protection class

IP20

Operating temperature

-10 °C (14 °F) .. +55 °C (131 °F)

Impact resistance

IK07 according to IEC 62262

Current measurement

 

module 800-CT8-A

Rated current

5 A

Channels

8 (2x4)

 · 2 systems (L1, L2, L3, N)

 · Individual channels

Metering range

0 .. 6 Arms

Crest factor

2 (based on 6 Arms)

Overload for 1 s

120 A (sinusoidal)

Resolution

0.1 mA (color graphic display 0.01A)

Overvoltage category

300 V CATII

Rated surge voltage

2,5 kV

Power consumption

approx. 0.2 VA (Ri = 5 m

)

Sampling frequency

8.3 kHz

Frequency of the 
power frequency

40 Hz .. 70 Hz

Harmonics

1 .. 9. (only odd)

Transport and storage

The following information applies to devices which are  
transported and stored in the original packaging
Free fall

1 m (39.37 in)

Temperature

K55 

-25 °C (-13 °F) up to +70 °C (158 °F)

Relative humidity

5 to 95% at 25 °C (77 °F) 

without condensation

Ambient conditions during operation, see base unit

Interface and energy supply

JanBus (proprietary)

Via bus connector

Item no. 33.03.378

Fig.: Module 800-CT8-A

INFORMATION

 · Detailed technical data for the module 

can be found in the user manual.

 · Technical data for the base unit and 

information on the procedure in the event 
of errors can be found in the usage infor-
mation for your base unit.

Terminal connection capacity - Module 800-CT8-A

Connectable conductors. 

Only one conductor can be connected per terminal.
Single core, multi-core, 

fine-stranded

0.2 - 2.5 mm

2

, AWG 26-12

Cable end sleeve (not insulated)

 · recommended stripping length 

0.2 - 2.5 mm

2

, AWG 26-12

 · 10 mm (0.3937 in)

Cable end sleeve (insulated) *

 · recommended stripping 

length **

0.2 - 2.5 mm

2

, AWG 26-12

 · 12 mm

 

(≤1,5 mm

2

), 10 mm (>1.5 mm

2

) / 

0.47 in (≤1.5 mm

2

), 0.39 in (>1.5 mm

2

)

Cable end sleeve

Length of the contact sleeve ** 8 - 12 mm (0.31 - 0.47 in)
Tightening torque screw 

flange

0.2 Nm (1.77 lbf in)

...  Applies to wire end sleeves with a maximum outer diameter of the 

plastic collar up to 4.5 mm (0.18 in).

** 

..  Depending on the type of cable end sleeves used (cable end sleeve 

manufacturer).

Summary of Contents for 800-CT8-A

Page 1: ...omponenten unverz glich au er Betrieb und sichern es gegen unbeabsichtigte Inbetriebnahme Es ist anzunehmen dass ein gefahrloser Betrieb unm glich ist wenn das Basisger t mit Kompo nenten z B Sichtbar...

Page 2: ...r einer unmittelbar gef hrlichen Situation die bei Nichtbeachtung zu geringf gigen oder m igen Verletzungen f hren kann INFORMATION Verweist auf Vorg nge bei denen keine Gefahr von Personen oder Sachs...

Page 3: ...enachbarte unter Spannung stehende Teile abdecken oder abschranken Abb Modul 800 CT8 A 3 Eingangskontrolle Der einwandfreie und sichere Betrieb der Ger te und dessen Komponenten setzen sachgem en Tran...

Page 4: ...220 g 0 49 lb Ger teabmessungen ca B 73 mm 2 87 in H 90 mm 3 54 in T 76 mm 2 99 in Einbaulage beliebig Befestigung Montage geeignete Hutschienen 35 mm TS 35 7 5 nach EN 60715 TS 35 10 TS 35 15 x 1 5...

Page 5: ...afe operation is no longer possible shut down your device with the components immediately and secure it from being unintentionally started back up again It can be assumed that safe operation is imposs...

Page 6: ...angers of personal injuries or property damage WARNING Warns of a potentially dangerous situation that can result in serious injuries or death in the event of noncompliance INFORMATION The scope of de...

Page 7: ...Decouple the bus connector JanBus interface of your module from the base unit and or the connected modules by pulling out your module 4 Unlatch all bottom latches of your module Recommendation Use a...

Page 8: ...220 g 0 49 lb Device dimensions approx w 73 mm 2 87 in h 90 mm 3 54 in d 76 mm 2 99 in Installation position discretionary Mounting assembly suitable DIN rails 35 mm 1 38 in TS 35 7 5 according to EN...

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