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WhisperPower BV 

Kelvinlaan 82, 9207 JB Drachten, The Netherlands, Tel: +31 (0) 512 571 550, Fax: +31 (0) 512 571 599, [email protected], www.whisperpower.com

-  Safety by galvanic 
  isolation of AC power
-  Prevention of galvanic corrosion
-  Low noise, low weight 

to roidal

  transformer with vibration 
  isolated mounting
-  Soft starter integrated

USER MANUAL

WP-GI

WhisperPower Galvanic

 Isolation-transformer

Protective hull isolation for boats

Galvanic safety isolation for vehicles

1. General InstructIon

Thank you for choosing our product. This manual contains 
important safety and operation instructions. Please read 
this manual before use. The WP-GI NeeDS To Be INSTALLeD 
By A SKILLeD TeChNICIAN. 

1.1 safety instruction

As dangerous voltages and high temperatures exist within the 
WP-GI, only qualified and authorized maintenance personnel are 
permitted to open and repair it.
This manual contains information concerning the installation and 
operation of the WP-GI. All relevant parts of the manual should 
be read prior to commencing the installation. Please follow the 
local regulations. Any operation against the safety requirement or 
against design, manufacture and safety standard are out of the 
manufacturer warranty.

1.2 General precautions

-  Do not expose the WP-GI to dust, rain, snow, liquids or 
  gases of any type, it is designed for indoor use only in a 
  well ventilated area.
-  Do NoT block ventilation, otherwise the WP-GI may overheat.
-  To avoid fire and electric shock,make sure all cables have the 

correct thickness and are connected well. 

-  Please do not put any inflammable goods near to WP-GI.
-  Never place the unit directly above batteries; gases from 
  a battery will corrode and damage the WP-GI.

2. General DescrIptIon

The WP-GI is a high efficiency galvanic isolation transformer with 
softstart function integrated. The softstart prevents tripping of 
circuit breakers when the transformer is magnetized at startup. 
It can be used as 230V to 230V transformer, 110V to 110V, 110V 
to 220V and 230V to 115V. In every situation, the full power can 
be taken from the output. The softstart adapts according to the 
chosen input voltage. 

The frequency of the AC output voltage 

will be the same as the frequency of the input voltage.

For protection, a residual current detector (ground fault circuit 
interrupter) with integrated circuit breaker should be installed up 
stream. An optional cover plate can be installed which can accom-
modate a standard DIN mounted device (see installation section).

2.1 safety device

The AC output (secondary) connection is electrically isolated from 
the AC input (primary) connection and floating with respect to 
earth potential. 
Note that the Neutral on secondary side can be connected to the 
Pe on secondary side which polarizes the signal AC out. Never 
touch the connections within when the unit is live.

2.2 corrosion prevention for boats and ships

The device is mainly designed to be used as a galvanic isolation 
transformer to break the ground loop which causes galvanic corro-
sion on metal hulls on boats and ships.
The primary protective earth (Pe) connection is terminated in the 
isolation transformer without making any electrical connection. 
The Pe of the secondary side is connected to a shield inside the 
transformed and the metal cabinet of the WP-GI. This secondary 
Pe connection is connected to the grounding system of the ship 
forming a safe situation on board without the grounding loop to 
shore which causes the galvanic corrosion.
A special connection can be made when the boat is on dry dock, 
connecting the primary Pe to the secondary Pe temporarily.

2.3 protections

The equipment is being protected against basic failures through 
hardware protection circuitry making it a robust and reliable 
equipment.

overheat protection

In case a too high transformer temperature is detected, the WP-GI 
will switch off the output and the ´PRoTeCT´ led inside the connec-
tion compartment will be lit. 

WARNING:

  After cooling down, the WP-GI will 

automatically reconnect the AC output. 

High voltage protection

In case 230V is applied while the 110V setting is selected, fuses 
F1 will be blown which disables the softstart function. The unit will 
not switch on.
 

WARNING:

 Fuses F1 are inside the unit. 

Replacement of the fuses must be done by a 
skilled technician only.

If the correct voltage is selected and connected when the fuses 
F1 are blown, the transformer will magnetize immediately. Usually 
this will result in tripping of the circuit breaker installed at the grid 
input side upstream. The fuses F1 should be replaced. 

2.4 Before installation

Before installation choose:
-  input voltage
-  output voltage
-  connect secondary Pe to secondary N according to regulations.
   

2.5 Installation     

a

  AC input cable 230V / 110V, 2.5mm

2

 or 6mm

2

B

  AC output cable 230V / 110V,  2.5mm

2

 or 6mm

2

c

  Select AC input voltage 

D

 Select AC output voltage 

e

  Ground stud

WARNING:

 AC 230V is lethal! Double check 

that no voltage is present on the AC input cable 
before installing the cables or opening the cover. 

Material list 

The unit is packed with following materials. Please confirm the 
series number on the unit is the same as on the outer carton
- WP-GI
-  User manual
-  Cable jumper to connect N to secondary Pe
-  Cable jumper to connect primary Pe to secondary Pe

location

Please install the WP-GI in a dry, clean and good ventilated location.
Working temperature: -10 to 70º (derating above 45º)
Storage temperature:  -40 to 70º
Relative humidity:  

0 to 95%, non-condensing

Cooling:  

Forced air, temperature controlled.

General advice

Before connecting the equipment, verify the AC input voltage and 
required output voltage according to the installation. 

WARNING:

 Do not connect the output of this 

equipment to your AC system in parallel with any 
other AC source

It is recommended to connect a Ground Fault Circuit Interrupter or 
Residual Current Circuit Breaker  and Circuit Breaker (20A or 40A) 
at the AC input side (upstream). on the AC output side, a circuit 
breaker is recommended before each branch.
It is not necessary to install a circuit breaker directly at the output 
of the WP-GI when appropriate cables have been used at input 
and output side. 

WARNING:

 Recommendations in this 

manual are just an advice. Always follow local 
regulations! The installer is responsible for 
correct installation of the device!

Installation and connection

WARNING:

 For the safety of the installer, 

cut off all power before installation 

Mount the Wp-GI

The WP-GI must be mounted vertically. Keep the vibration as small 
as possible. Keep proper ventilation space around the unit: 200mm 
to the wall, floor and other equipment.

 

The WP-GI can be mounted by a suitable central bolt or stud and 
bolts or studs at the bottom. See drill pattern:

 

only mount on a solid (concrete or metal) wall. 
The unit weights 25 kg. Schematic overview:

connectInG tHe Wp-GI 

Wiring recommendation

Please find the following minimum wire size. 

connecting the ac cable

AC input cable: 

Pull the AC input cable through the gland and connect it to the 
AC input connector. Connections are marked as “L”-line, 
“N”-neutral (or “L2”-line) and “Pe”-earth. Make sure it is tightly 
screwed. Choose the proper input terminals according to the table 
found on the connector PCB inside the connection compartment.

choosing the input voltage:

The input and output voltage can be selected independent from 
each other. It is done in the following section in the connection 
compartment.

Note that if dual phase 110V is connected to the input, 
the Neutral is not connected.

connection 230V input

connection 110V 
single phase input

connection 110V 
dual phase input

NO

T R

ELEASED FO

SA

LE

S

DA

TA

SH

EE

T U

NDE

R CONSTR

UC

TIO

N

!

Galvanic Isolation-transformer

WP-GI

Whisper Power Galvanic 

Isolation-transformer

Transformer for safety and hull protection to prevent corrosion

115

230VAC

230VAC

SHORE

PE

N

L

PE

N

L

SHIP

115

115

115

Galvanic Isolation-transformer

WP-GI

Whisper Power Galvanic 

Isolation-transformer

Transformer for safety and hull protection to prevent corrosion

115

230VAC

230VAC

SHORE

PE

N

L

PE

N

L

SHIP

115

115

115

min.

 200mm

min. 200mm

min. 200mm

min. 200mm

min.

 200mm

80

500mm

80

DRILL PATTERN WPC

(holes appropriate according bolt or screws)

80

Detail 

backside

Only mount the two screws

which are easily accessible

2

4

3

80

500mm

80

DRILL PATTERN WPC

(holes appropriate according bolt or screws)

80

Detail 

backside

Only mount the two screws

which are easily accessible

2

4

3

Voltage/current 

ac wiring

230V / 16A 

2.5mm²

110V / 32A 

6mm²

D

B

B

e

remove cover two bolts

c

a

a

1

3

5

4

5

2

TORX M4x12 PANHEAD

7001P11299

50211641

4

1

Cable WP-GI

5012P12775

NOT_REQUIRED

3

1

Cable WP-GI

5012P12773

NOT_REQUIRED

2

1

WP-GI Cover Connections Branded

5012A12558

NOT_REQUIRED

1

1

WP GI WITHOUT CONNECTION COVER AND CABLES

5012A12508

NOT_REQUIRED

ITEM 

NO.

Defau

lt/QTY

.

DESCRIPTION

DRAWING

ARTICLE No.

D

E

F

C

1

2

3

4

B

A

3

2

1

5

C

D

4

6

7

8

A

B

A3

PROJECTION : THIRD ANGLE
UNITS : mm

SHEET FORMAT:

M.B.

21-9-2012

PRINTED

WP-GI

DRAWN

CHK'D

UNLESS OTHERWISE SPECIFIED:
CHAMFER SHARP EDGES
GENERAL TOLERANCE
NEN ISO 2768-m
FORM AND PLACE TOLERANCES 
NEN-ISO 1101
WELDING SYMBOL NEN EN 22553
ROUGHNESS ACC. to NEN3634

SIGNATURE

DATE

STATUS:

DO NOT SCALE DRAWING

REVISION

TITLE:

ARTICLE NO.

SCALE:1:5

SHEET 1 OF 4

Powdercoated RAL9003 
finestructure

Weight: - gram

20-8-2012

NOT_REQUIRED

TOLERANCE PRINCIPE
ISO 8015

DRAWING:

5012A12869

FINISH:

NAME

Material:

Galvanic Isolation-transformer

WP-GI

Whisper Power Galvanic 

Isolation-transformer

Transformer for safety and hull protection to prevent corrosion

115

230VAC

230VAC

SHORE

PE

N

L

PE

N

L

SHIP

115

115

115

C

2

3

1

4

B

A

D

E

Material <not specified>

Material:

NAME

16-2-2012

J.R.

FINISH:

DRAWING:

TOLERANCE PRINCIPE ISO 8015

21-9-2012

Weight: 12.26 gram

-

SHEET 1 OF 1

SCALE:1:1

ARTICLE NO.

TITLE:

REVISION

DO NOT SCALE DRAWING

STATUS:

DATE

SIGNATURE

UNLESS OTHERWISE SPECIFIED:

CHAMFER SHARP EDGES

GENERAL TOLERANCE

NEN ISO 2768-m

FORM AND PLACE TOLERANCES 

NEN-ISO 1101

WELDING SYMBOL NEN EN 22553

ROUGHNESS ACC. to NEN3634

CHK'D

DRAWN

Phoenix 

PRINTED

21-9-2012

M.B.

SHEET FORMAT:

PROJECTION : THIRD ANGLE UNITS : mm

A4

l1

pe

n

C

2

3

1

4

B

A

D

E

Material <not specified>

Material:

NAME

16-2-2012

J.R.

FINISH:

DRAWING:

TOLERANCE PRINCIPE ISO 8015

21-9-2012

Weight: 12.26 gram

-

SHEET 1 OF 1

SCALE:1:1

ARTICLE NO.

TITLE:

REVISION

DO NOT SCALE DRAWING

STATUS:

DATE

SIGNATURE

UNLESS OTHERWISE SPECIFIED:

CHAMFER SHARP EDGES

GENERAL TOLERANCE

NEN ISO 2768-m

FORM AND PLACE TOLERANCES 

NEN-ISO 1101

WELDING SYMBOL NEN EN 22553

ROUGHNESS ACC. to NEN3634

CHK'D

DRAWN

Phoenix 

PRINTED

21-9-2012

M.B.

SHEET FORMAT:

PROJECTION : THIRD ANGLE UNITS : mm

A4

l1

pe

n

C

2

3

1

4

B

A

D

E

Material <not specified>

Material:

NAME

16-2-2012

J.R.

FINISH:

DRAWING:

TOLERANCE PRINCIPE ISO 8015

21-9-2012

Weight: 12.26 gram

-

SHEET 1 OF 1

SCALE:1:1

ARTICLE NO.

TITLE:

REVISION

DO NOT SCALE DRAWING

STATUS:

DATE

SIGNATURE

UNLESS OTHERWISE SPECIFIED:

CHAMFER SHARP EDGES

GENERAL TOLERANCE

NEN ISO 2768-m

FORM AND PLACE TOLERANCES 

NEN-ISO 1101

WELDING SYMBOL NEN EN 22553

ROUGHNESS ACC. to NEN3634

CHK'D

DRAWN

Phoenix 

PRINTED

21-9-2012

M.B.

SHEET FORMAT:

PROJECTION : THIRD ANGLE UNITS : mm

A4

l1

pe

l2

Galvanic Isolation-transformer

WP-GI

Whisper Power Galvanic 

Isolation-transformer

Transformer for safety and hull protection to prevent corrosion

5012DTP12002 WP-GI Front label

Name:

90% black

Colour label:

Colour printing:

Example: 

Transparant Clear 

no adhesive (glue)

Dimensions:

14 - 06 - 2012

Date:

Revision:

100% white OR Silver

B 76mm x H 122mm

Size:

115

230VAC

230VAC

SHORE

PE

N

L

PE

N

L

SHIP

115

115

115

AC

in

AC

out

C

2

3

1

4

B

A

D

E

Material <not specified>

Material:

NAME

16-2-2012

J.R.

FINISH:

DRAWING:

TOLERANCE PRINCIPE

ISO 8015

21-9-2012

Weight: 12.26 gram

-

SHEET 1 OF 1

SCALE:1:1

ARTICLE NO.

TITLE:

REVISION

DO NOT SCALE DRAWING

STATUS:

DATE

SIGNATURE

UNLESS OTHERWISE SPECIFIED:
CHAMFER SHARP EDGES
GENERAL TOLERANCE
NEN ISO 2768-m
FORM AND PLACE TOLERANCES 
NEN-ISO 1101
WELDING SYMBOL NEN EN 22553
ROUGHNESS ACC. to NEN3634

CHK'D

DRAWN

Phoenix 

PRINTED

21-9-2012

M.B.

SHEET FORMAT:

PROJECTION : THIRD ANGLE

UNITS : mm

A4

C

2

3

1

4

B

A

D

E

Material <not specified>

Material:

NAME

16-2-2012

J.R.

FINISH:

DRAWING:

TOLERANCE PRINCIPE

ISO 8015

21-9-2012

Weight: 12.26 gram

-

SHEET 1 OF 1

SCALE:1:1

ARTICLE NO.

TITLE:

REVISION

DO NOT SCALE DRAWING

STATUS:

DATE

SIGNATURE

UNLESS OTHERWISE SPECIFIED: 
CHAMFER SHARP EDGES 
GENERAL TOLERANCE 
NEN ISO 2768-m 
FORM AND PLACE TOLERANCES  
NEN-ISO 1101 
WELDING SYMBOL NEN EN 22553 
ROUGHNESS ACC. to NEN3634

CHK'D

DRAWN

Phoenix 

PRINTED

21-9-2012

M.B.

SHEET FORMAT:

PROJECTION : THIRD ANGLE

UNITS : mm

A4

l

n

pe

l

n

pe

nc

Main Input power 

Disconnect circuit

Breaker with GFp

Ground lug

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