UNDERVOLTAGE RELEASE FOR CIRCUIT BREAKER

摘要

Of the Disclosure An undervoltage trip coil and armature, with a pivotal member biased against and riding on the latch pin of the armature to sense its position. On occurence of a low voltage condition, a trip lever causes the latch mechanism of the breaker to trip. The pivotal member then interferes with the latch and prevents reset. The undervoltage trip coil is normally energized to normally attract the undervoltage armature. On occurrence of a specified undervoltage condition the armature releases causing the trip lever to trip the latch mechanism and allowing the pivotal member to interfere with the latch of the breaker. During such condition, the breaker cannot be reset until the armature is attracted to the undervoltage coil under proper voltage condition.