Circuit breaker

Abstract

A circuit breaker includes a holder unit having a holder case. The holder case accommodates a pair of sliding contactors, a rotating shaft, and a pair of sliding contact pressure springs therein. The pair of sliding contactors are arranged to sandwich opposite lateral surfaces of a base end portion of a movable contactor. The rotating shaft extends through a first shaft hole formed in the base end portion of the movable contactor and second shaft holes formed in the pair of sliding contactors. Each of the pair of sliding contact pressure springs is constituted by a coil spring. The each of the pair of sliding contact pressure springs includes a reduced-diameter coiled portion wound around the outer periphery of the rotating shaft, and an increased-diameter coiled portion in contact with a portion of an outer surface of a corresponding sliding contactor which portion is radially outward of the second shaft hole thereof.

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