Westinghouse Electric Corporation

Charles K Wallace

Stanislaw A Milianowicz

Norman Davies

A circuit breaker characterized by a voltage-responsive device having an electromagnet including an armature. A linkage connects the armature to the trip latch of the circuit breaker in order to open the circuit breaker contacts when a voltage occurs that is less than a predetermined voltage value. Under normal operating conditions, when the contacts are closed, the armature is retained in place by an electromagnetic force, but is biased away therefrom when the voltage drops below that voltage value.

Circuit interrupter with undervoltage trip mechanism

There is provided by this invention a vacuum monitoring device for use in vacuum circuit interrupters comprising a stacked resistor assembly as a voltage divider coupled to an internal shield of the vacuum bottle and a low voltage detection circuit for monitoring leakage currents under abnormal pressure conditions.

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Penn Hills Township, PA, United States of America

Charles K Wallace