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Electronic-current transformers are practical switches. The possible length of the connection cable solely depends on the external circuit.

Electronic-current transformers have an inner diameter of 11 mm. Insulated switching wires and stranded wires up to approx. 35 ø nominal cross-section and UL-approved stranded wires up to AWG 4 can be inserted through.

The STWA1S electronic current transformer is not designed for connection to STW relays. It has a residual current of 0.6 mA, which means that the input on the STW would always detect a running machine.
Alternatively, the STWA1SEH current transformer can be used.
Alternative STWA1SEH

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