Patent ID: 8958196
Filing Date: 2015-02-17
Classification: H01H

Abstract:
1. An electric circuit connected to a thermal switch with three terminals, comprising: a fixed conductor having a fixed contact; a first terminal incorporated into the fixed conductor as a unitary construction for external connection; a movable plate formed by an elastic substance provided with a movable contact facing the fixed contact and having a specified contact pressure; a second terminal formed at an opposite end point with respect to the movable contact of the movable plate for external connection; a third terminal provided adjacent to an internal resistor unit and formed as branching from contact by a slit from an end portion where the second terminal is formed; and a bimetal element engaged with the movable plate and inverted at a specified temperature, with the thermal switch with three terminals having a configuration of the contact which is in an OFF position in a normal temperature, and closing the contact according to a thermal operation, wherein: the electric circuit is connected to a thermal switch with three terminals having lightning arrestor used in equipment connected to an AC or a DC power supply; the lightning arrestor is connected between the first and third terminals; the second terminal is connected to the power supply side and the first terminal is connected to a ground side, or the second terminal is connected to the ground side and the first terminal is connected to the power supply side; and a capacitor of a specified capacity is connected parallel to the first and second terminals, or the first and third terminals.