Circuit breakers with ptc (positive temperature coefficient...

Details Circuit breakers with ptc (positive temperature coefficient... Circuit breakers with ptc (positive temperature coefficient...

H - Electricity

01

H

H01H 7/00 (2006.01) H02H 3/02 (2006.01) H02H 9/02 (2006.01) H01H 3/22 (2006.01) H01H 9/32 (2006.01) H01H 9/42 (2006.01) H01H 71/10 (2006.01) H01H 77/10 (2006.01) H02H 3/33 (2006.01)

Patent

CA 2266536

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.

Un élément résistant à coefficient de température positif (CTP) possède une résistivité qui augmente avec la température. Les disjoncteurs comportants des éléments CTP peuvent assurer une meilleure protection contre les surcharges et les courts-circuits que les disjoncteurs existants. On peut associer ces disjoncteurs à éléments CTP à des circuits de détection de défauts de mise à la terre de manière à activer le disjoncteur dans des conditions de défaut à la terre qui sont moins graves que les conditions de surintensité qui activent normalement le disjoncteur. Un ensemble déclencheur shunt comportant une résistance à coefficient de température positif réduit la puissance nominale requise pour le commutateur de remise à zéro.

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