Fault indicator

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With electromagnetic field

Patent

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Details

340654, G01R 120

Patent

active

042348471

ABSTRACT:
An automatically resettable fault indicator includes a rotatably-mounted target viewable from the exterior of the indicator for indicating circuit status. The target is positioned in a reset-indicating state by a reset circuit which periodically energizes a first winding to position a permanent magnet mounted for rotation with the target. Upon occurrence of a fault circuitry within the indicator energizes a second winding to reposition the target to a fault-indicating position. A delay circuit in the fault-responsive circuitry prevents simultaneous energization of the first and second windings, and an auxiliary pole piece associated with the main pole piece assists in repositioning the target to the fault-indicating position, for improved performance and reliability in responding to fault currents.

REFERENCES:
patent: 3460038 (1969-08-01), Ziegler
patent: 3761731 (1973-09-01), Burgett

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