Dual element fuse

H - Electricity – 01 – H

Patent

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Details

H01H 85/041 (2006.01) H01H 85/055 (2006.01) H01H 85/36 (2006.01)

Patent

CA 2127868

An electrical interruption device is disclosed in which an overcurrent protective device is provided to interrupt electric current flow on a sustained overcurrent current occurring. The overcurrent protective device is characterized by a plunger which is held in tension against the force of a spring by a low temperature solder, and further in which a sleeve of insulating material, such as silicone, is provided about the plunger. Preferably, the overcurrent protective device includes a housing, with the plunger disposed in the housing and having one end extending therefrom to provide electric communication with the remainder of the electric circuit. The sleeve of insulating material preferably being located about the end of the plunger which extends from the housing. On a predetermined condition causing the solder to melt, the plunger is released and under the force of the spring is moved to a position retracted within the sleeve, interrupting the current flow. Advantageously, the overcurrent protective device may be used together with pulverulent arc quenching material. The sleeve acts to isolate the pulverulent arc quenching material from the plunger and prevent its interference with the plunger as it is moved under the force of the spring.

Interrupteur électrique comportant un dispositif de protection contre les surtensions qui coupe le courant quand une surtension se manifeste de façon soutenue. Le dispositif de protection contre les surtensions est caractérisé par un piston qui est maintenu en tension contre la force d'un ressort par une soudure basse température et, en outre, un manchon de matériau isolant, telle la silicone, entoure le piston. De préférence, le dispositif de protection contre les surtensions comprend un boîtier dans lequel est placé le piston dont un bout en sort pour assurer la communication électrique avec le reste du circuit électrique. Le manchon de matériau isolant est placé de préférence autour du bout du piston qui sort du boîtier. Dans une situation prédéterminée causant la fusion de la soudure, le piston est libéré et déplacé par la force du ressort vers une position en retrait à l'intérieur du manchon, ce qui coupe le courant. Avantageusement, le dispositif de protection contre les surtensions peut être utilisé avec un matériau pulvérulent à extinction d'arc. Le manchon sert à isoler du piston le matériau pulvérulent à extinction d'arc pour prévenir son interférence avec le piston lorsqu'il est déplacé par la force du ressort.

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