COMMON CIRCUIT FOR UNDER VOLTAGE AND SHUNT RELEASE

摘要

The present disclosure relates to a shunt and under voltage release in a circuit breaker. In an embodiment the disclosed shunt and under voltage release incorporate a common circuit. In another embodiment the disclosed shunt and under voltage release is self-resetting and uses a single electromagnetic coil for both hold-on force and pick-up force that meets the requirement of self resetting. In another embodiment, the disclosed shunt and under voltage release employs Pulse Width Modulation (PWM) technique to control the duty cycle of the electromagnetic coil. Further the disclosed shunt and under voltage release incorporates means to avoid tripping of the circuit breaker due to momentary fluctuation of voltage.