Wiring Current Transformer

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DANGER: Risk of electric shock

If the device is disconnected, the secondary side of the relevant current transformers must be short circuited.
Install the current sensors and corresponding measuring devices only when the power supply of the system is disconnected.
When the current transformer is operated with an open secondary circuit, hazardous voltages may occur at the secondary terminal blocks.

 

When measuring by means of current transformers or Rogowski coils, the accuracy is greatly influenced by the quality of the current sensors used.

Pin assignment example

 

Maximum tightening torque for the relevant screws: 0.5 Nm ... 0.6 Nm.

 

Hint: This image shows an example of EEM-MA770

 

I1, I2, I3	Current measuring input, current transformer
DI+, DI-	Digital input
DO+, DO-	Digital output
L, N(L)	Supply
V1, V2, V3, VN	Voltage measuring input
FE	Functional ground
X1-ETH	Modbus/TCP / REST-API (RJ45)
LED	Status
Optional power supply (depending on the version):
L, N(L)	Power supply for 230V/400V AC (L-N/L-L)
24V DC +,-	Power supply for 24V DC (+/-)
Optional communication interface (depending on the version):
LED	Status
1 x RS-485	RS-485 connection (Modbus/RTU)
2 x ETH RJ45	Ethernet connection (PROFINET in PN-devices)
	Ethernet connection (EtherNet/IP™ in EIP-devices)

 

 

 

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EMpro online documentation
Published/reviewed: 2025-07-15, en revision 003, Version history