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Automation Components, Inc.

2305 Pleasant View Road  |  Middleton, WI 53562

Phone:

 1-888-967-5224  |  

Website:

 workaci.com

Page 1

Version: 10.0

I0000788

PRECAUTIONS

• This product is not intended to be used for 

Life or Safety applications.

• This product is not intended for use in any 

hazardous or classified locations.

• The A/ACS2, A/ACSX2, A/ASCS2 & A/ASCSX2 

Series Adjustable Switches must be used on 
Insulated Conductors Only.

HIGH VOLTAGE
• Disconnect and lock out all power sources 

before installation as severe injury or death 
may result from electrical shock due to 
contact with high voltage wires.

• Never rely on the Red LED to determine 

whether power is present at the current 
switch.  At very low monitored input currents 
the Red LED may not light to indicate the 
current is above the trip point.

GENERAL INFORMATION

The Adjustable Current Switches are designed for 
use in any AC current monitoring application in 
which you are looking to monitor a particular piece 
of equipment for equipment failure, preventative 
maintenance, status, and electrical load status.  The 
current switches should be installed on the line side 
of the power to the electrical equipment.  The 
current switches are available in both solid and 
split-core versions which also includes a Patented 35 
mm Din Rail mounting foot for easy installation in 
panel mount applications. The adjustable current 
switches can be used to determine the run time of 
your equipment as well as basic load trending applications where you want to know when how long your 
piece of equipment runs when logging the contact closures on your building management system or PLC. 

 

INSTALLATION

Ensure all installations are in compliance with all national and local electrical codes. Only qualified 
individuals that are familiar with codes, standards, and proper safety procedures for high-voltage 
installations should attempt installation.  The current switches will not require external power because the 
power for the current switch is induced from the conductor being monitored.

FIGURE 1: 

DIMENSIONS

ADJUSTABLE SWITCHES 

SERIES

Installation & Operation Instructions

Part # A/ACS2, A/ACSX2, A/ASCS2, A/ASCS2-L, A/ASCSX2

Phone:

 1-888-967-5224

Website:

 workaci.com

The current switch may be mounted in any position 
using the two #8 x 3/4” Tek screws and the mounting 
holes in the base, or snapped directly on to the 35mm 
DIN rail (See 

Figure 3

).  Leave a minimum distance of 

1” (3 cm) between the current switch and any other 
magnetic devices such as contactors and 
transformers.     

Latch Operation for A/ASCS2 Series                                       

Press down on the side tab and swing the top of the 
unit up to open the split core current switch as shown 
in 

Figure 2

.  Press down firmly on the cover to close the 

current switch.  An audible “click” will be heard as the 
tab slides over the tongue on the base.

CAUTION:

 Mating surfaces of the magnetic core are 

exposed when the sensor is open.  Electrical contact 
grease, present on the cores to prevent corrosion, can 
capture grit and dirt if care is not exercised.  Operation 
can be impaired if anything prevents good contact 
between pole pieces.  Visually check the mating parts 
of the core before closing the current sensor.

LED

The Red LED will indicate whether the current is above 
(LED On) or below (LED Off) the fixed trip point.  At very 
low monitored input currents the Red LED may not 
light to indicate the current is above the trip point.

APPLICATION NOTES 

The conductor being monitored may be looped through the sensor multiple times. The loops increase the 
current measured by the current switch. Each time the conductor passes through the current switch window 
equals one loop (See 

Figure 4

 p. 2). To determine the proper number of loops required, take the rated Fixed 

Trip Point of the current switch and divide it by the Operating Current of the Monitored Device, add one (1), 
then round up to the nearest whole number.  

Example: 

When using the A/ACS2, a small fan operating at 

0.1A should be wrapped through the sensor four times to give you a total operating current of 0.4 Amps 
flowing through the A/ACS2.  Formula Example: (0.25A/0.1A) = 2.5 + 1 = 3.5, which rounded up equals 4 
loops.

WIRING INSTRUCTIONS

ACI recommends the use of a two conductor 16 to 22 AWG shielded cable or twisted pair copper wire only, 
for all current switch applications.  A maximum wire length of less than 30 meters (98.4 feet) should be used 
between the current switch and the Building Management System or controller.

Note: 

 When using a shielded cable, be sure to connect only (1) end of the shield to ground at the controller.  

Connecting both ends of the shield to ground may cause a ground loop.  When removing the shield from the 
sensor end, make sure to properly trim the shield to prevent any chance of shorting.  

The current switch output terminals represent a solid-state switch for controlling both AC and DC loads and 
are not polarity sensitive.  Tighten the screws at the terminal block connections to the recommended torque 
of 0.5 to 0.6 Nm (4.43 to 5.31 in-lbs.).  The aperture (hole) size of the current switch is 0.75” (1.90 cm).

Solid-Core

2.36” (59.94mm)

2.77”

(70.45mm)

2.87” (72.80mm)

3.35” (84.99mm)

1.03”

(26.16mm)

Split-Core

2.55” (64.69mm)

3.24” (82.23mm)

2.77”

(70.35mm)

1.10” (28.02mm)

2.87” (72.77mm)

APPLICATION EXAMPLES

See 

Figure 5 

(p.3) and 

Figure 6 

(p.3) for two different current switch applications. 

Figure 5 

(p.3) is showing 

the use of the Go/No Go Current Switch as a Digital Input to your BAS/PLC Controller. 

Figure 6 

(p.3) shows a 

Go/No/Go Current Switch in conjunction with a Contactor to  control an exhaust fan.  

Note:

 The ACI Go/No Go Current switches are only rated at 0.2A @ 200 VAC/VDC and must use an additional 

Contactor if controlling motor/fans. 

CALIBRATION OF ADJUSTABLE TRIP POINT

The adjustable current switch has an operating range of 0-250 Amps, 

Do not exceed!

  The current switch has 

an adjustable trip point range of 0.50 - 220 Amps, 1.50 - 220 Amps, or 0.60 - 180 Amps depending on the 
model. See 

Ordering Table

 on p.5 to determine the adjustable trip point range per model number.  The 

adjustable current switch comes with its fifteen-turn adjustment potentiometer set to the maximum trip 
point position.  The adjustable current switch can monitor Underload, Normal Load, and Overload 
conditions, depending on how it’s set.  The procedure below is for the Normal load condition for part 
numbers A/ACS2, A/ASCS2 and A/ASCS2-L.

Normal Loads

With current flowing through the aperture of the adjustable current switches, first verify that
the Blue LED is on. If the Blue LED is on, now slowly adjust the potentiometer clockwise until the Red LED
just turns on and stop immediately. This will set the trip point at your normal operating load current.

If the RED LED is on after initial power up, this means that you will need to slowly adjust the potentiometer
counter-clockwise until the Blue LED turns on and then slowly adjust the potentiometer clockwise until the
Red LED just turns on and stop immediately. The adjustable current switch is now tripped. Now verify the
output with an Ohmmeter to verify that the contacts of the switch are approximately 0.200 Ohms. The
adjustable current switch Hysteresis (Dead Band) is typically 10% of the trip point.
Clockwise = Decrease Trip Point
Counter-clockwise = Increase Trip Point

Содержание A/ACS2

Страница 1: ...s should be installed on the line side of the power to the electrical equipment The current switches are available in both solid and split core versions which also includes a Patented 35 mm Din Rail mounting foot for easy installation in panel mount applications The adjustable current switches can be used to determine the run time of your equipment as well as basic load trending applications where...

Страница 2: ...s shown in Figure2 Press down firmly on the cover to close the current switch An audible click will be heard as the tab slides over the tongue on the base CAUTION Mating surfaces of the magnetic core are exposed when the sensor is open Electrical contact grease present on the cores to prevent corrosion can capture grit and dirt if care is not exercised Operation can be impaired if anything prevent...

Страница 3: ...ds the use of a two conductor 16 to 22 AWG shielded cable or twisted pair copper wire only for all current switch applications A maximum wire length of less than 30 meters 98 4 feet should be used between the current switch and the Building Management System or controller Note When using a shielded cable be sure to connect only 1 end of the shield to ground at the controller Connecting both ends o...

Страница 4: ...o No Go Current switches are only rated at 0 2A 200 VAC VDC and must use an additional Contactor if controlling motor fans CALIBRATION OF ADJUSTABLETRIP POINT The adjustable current switch has an operating range of 0 250 Amps Do not exceed The current switch has an adjustable trip point range of 0 50 220 Amps 1 50 220 Amps or 0 60 180 Amps depending on the model See Ordering Table on p 5 to determ...

Страница 5: ...ion Screw Terminal Block Not Polarity Sensitive 16 to 22 AWG 1 31 mm2 to 0 33 mm2 Copper Wires only 4 43 to 5 31 in lbs 0 5 to 0 6 Nm 1 2 6 cm between current switch Relays Contactors Transformers SENSOR NON SPECIFIC INFORMATION Monitored Current Type Maximum AC Voltage Operating Frequency Range Core Style Sensor Power Amperage Range Isolation Voltage Trip Point Style Trip Point Contact Type Statu...

Страница 6: ...NOTES Automation Components Inc 2305 Pleasant View Road Middleton WI 53562 Phone 1 888 967 5224 Website workaci com Page 6 Version 10 0 I0000788 ...

Страница 7: ...NOTES Automation Components Inc 2305 Pleasant View Road Middleton WI 53562 Phone 1 888 967 5224 Website workaci com Page 7 Version 10 0 I0000788 ...

Страница 8: ...nc 2305 Pleasant View Road Middleton WI 53562 Phone 1 888 967 5224 Website workaci com Automation Components Inc 2305 Pleasant View Road Middleton WI 53562 Phone 1 888 967 5224 Website workaci com Page 8 Version 10 0 I0000788 ...

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