The external neutral current transformer is a sensor required for a three-pole circuit breaker. The external neutral current transformer protect the neutral conductor. The external neutral current transformer protect against ground faults. This transformer has a rated current of 60-100 amps. This product complies to UL and CSA standards. This transformer has a tightening torque of 6-6 Nm, with a wire gauge of AWG 14 / AWG 10.