Circuit breakers with PTC (Positive Temperature Coefficient resi

Details Circuit breakers with PTC (Positive Temperature Coefficient resi Circuit breakers with PTC (Positive Temperature Coefficient resi

1997-08-25

1999-03-23

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 13, 361 45, 361106, 361165, H02H 300

Patent

active

058868607

ABSTRACT:
A Positive Temperature Coefficient Resistivity (PTC) element has a resistivity that increases as the temperature increases. Circuit breakers having PTC elements can achieve better overload and short circuit protection than existing products. Breakers with PTC elements can also be combined with ground fault detection circuits to activate the circuit breaker under ground fault conditions that are less severe than the overcurrent conditions that would normally activate the circuit breaker. A shunt trip assembly incorporating a PTC resistor reduces the required power rating of the clearing switch.

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