GROUND FAULT CURRENT INTERRUPTER

摘要

A differential amplifier circuit is connected between the secondary of a differential transformer and an electronic switch connected in series with a relay coil adapted to operate circuit breaker contacts when the current flow through the coil is changed. The differential amplifier circuit will sense a current unbalance in the transformer during either a negative or a positive half cycle and thereby immediately provide an output "trip" signal to the electronic switch. A delay circuit is connected between the differential amplifier circuit and the electronic switch to prevent accidental operation of the electronic switch by transient signals which are picked up by any part of the control circuit.