Patent ID: 9653240
Date: 2017-05-16
CPC Classifications: H01H

Claim:
1. A circuit breaker comprising: a fixed-contact piece with a fixed contact, a movable-contact piece with a movable contact for pushing the movable contact onto the fixed contact to make contact therewith, a thermal actuator element transforming along with its temperature change to move the movable-contact piece so that the movable contact and the fixed contact are opened, a positive temperature coefficient (PTC) thermistor for conducting electricity between the movable-contact piece and the fixed-contact piece through the thermal actuator element when the movable contact and the fixed contact are opened, a main body of a package provided with a holding recess holding the fixed-contact piece, the movable-contact piece, the thermal actuator element and the PTC thermistor, and a cover hermetically covering the holding recess, wherein the fixed-contact piece is embedded between an internal wall and an external wall of the package's main body, the internal wall of the package's main body is provided with an opened hollow which penetrates through the internal wall and which houses the PTC thermistor in a conductive state capable of conducting electricity between the thermistor and the fixed-contact piece, the external wall of the package's main body is provided with a through-hole which penetrates through the external wall so that, in a plan view, at least part of the through-hole is overlapped with at least part of the opened hollow, and the through-hole is not overlapped with the centroid of the opened hollow.