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What is the function of ground fault interface module in ACBs?

Ground-source return ground-fault sensing systems use one current sensor on the ground conductor connected to the circuit breaker via a ground-fault interface module. The current sensor measures the ground current flow.

The ground-fault interface module is used to sum the current flow in three-phase, four-wire systems and multiple-sourced systems using one or more specially designed current sensors  to measure current flow.
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