Circuit protection device

H - Electricity – 01 – H

Patent

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Details

H01H 37/52 (2006.01) H01C 7/02 (2006.01) H01C 13/00 (2006.01) H01H 37/14 (2006.01)

Patent

CA 2721512

There is provided a circuit protection device with even more possibility of protecting a circuit. In a circuit protection device comprising a circuit switching element which comprises a bimetal element as a circuit switching component and a movable terminal as well as a PTC element, (1) the PTC element and the movable terminal are connected electrically in parallel; (2) the circuit switching element is able to cut off current flowing through the circuit switching element by moving, through the actuation of the bimetal element at its actuating temperature (Top), the movable terminal positioned to pass current, and is able to pass current through the circuit switching element by moving, through the resetting of the bimetal element at its reset temperature (Tcl), the movable terminal positioned to pass current; (3) the actuating temperature (Top) of the bimetal element is at least 20 °C higher than the reset temperature (Tcl) of the bimetal element; (4) a trip temperature (Ttr) or the PTC element is at least 10 °C higher than the actuating temperature of the bimetal element; and (5) the bimetal element is placed between the PTC element and the movable terminal.

L'invention concerne un dispositif de protection de circuit qui augmente la probabilité qu'un circuit puisse être protégé. Dans un élément de commutation de circuit qui comprend un élément bimétallique comme composant de commutation de circuit et une borne mobile et un dispositif de protection de circuit qui comprend un PTC : (1) le PTC et la borne mobile sont reliés électriquement en parallèle ; (2) l'élément de commutation de circuit qui fonctionne à une température de service (Top) de l'élément bimétallique peut couper un courant qui circule dans l'élément de commutation de circuit en déplaçant la borne mobile qui a été positionnée de façon à permettre au courant de circuler, et le retour à une température de reprise (Tcl) de l'élément bimétallique permet au courant de circuler dans l'élément de commutation de circuit en déplaçant la borne mobile qui a été positionnée de façon à couper le courant ; (3) la température de service (Top) de l'élément bimétallique est au moins supérieure de 20 degrés Celsius à la température de reprise (Tcl) ; (4) une température de déclenchement (Ttr) du PTC est au moins supérieure de 10 degrés Celsius à la température de service de l'élément bimétallique ; et (5) l'élément bimétallique est positionné entre le PTC et la borne mobile.

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