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Grounding an Autotransformer

Recently I bought an Autotransformer to convert a 240vAc to 120/240VAc(split phase). This Autotransformer contains a relay to control the Ground on the neutral.

Someone know how this relay works? Needs a signal to activate?

Grounding
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I have this question, as well. I have a non-Victron inverter supplying 240 non-split phase to the AT. There is polarity indicated on the relay input (+ & -), so it appears to take more than a jumper. What input is required to close the circuit between output Neutral & Ground?

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