Fault current interrupter

Details Fault current interrupter Fault current interrupter

1984-10-29

1986-04-15

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 11, H01H 942

Patent

active

045831467

ABSTRACT:
A fault current interrupter is provided by the parallel combination of a positive temperature coefficient resistor 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 positive temperature coefficient resistor is selected to have a relatively low resistance at room temperature and a substantially higher resistance at higher temperatures. This allows the current to transfer away from the contacts through the positive temperature coefficient resistor until the voltage across the voltage dependent resistor causes the voltage dependent resistor to become conductive and thereby transfer the current away from the positive temperature coefficient resistor.

REFERENCES:
patent: 3249810 (1966-05-01), Strom et al.
patent: 3962145 (1976-06-01), Matsuo et al.

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