Circuit breaker with improved arc interruption function

Details Circuit breaker with improved arc interruption function Circuit breaker with improved arc interruption function

1998-01-14

2000-10-03

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 10, 361 58, 361106, 338 21, 338 22R, H01H 930

Patent

active

061281689

ABSTRACT:
A fault current interrupter is provided by the parallel combination of a polymer current limiter and a voltage dependent resistor connected across a pair of separable contacts to permit the interruption of current without the occurrence of arcing between the contacts when the contacts first become separated. The polymer current limiter is selected to have a relatively low resistance at quiescent operating currents and a substantially higher resistance at short circuit overcurrents. This allows the current to transfer away from the contacts through the polymer current limiter until the voltage across the voltage dependent resistor causes the voltage dependent resistor to become conductive and thereby transfer the current away from the polymer current limiter.

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