Patent ID: 8822862
Filing Date: 2014-09-02
Classification: H01H

Abstract:
1. A DC breaker comprising: a fixed terminal provided with a fixed contact; a movable armature provided with a movable contact which contacts to or separates from said fixed contact, said movable armature being provided with a shaft insertion hole passing therethrough in the approaching/separating direction of said movable contact with respect to said fixed contact; a shaft having a main body and a deterring part, said main body being inserted in said shaft insertion hole of said movable armature, said deterring part being formed in un-insertable shape in said shaft insertion hole and being coupled with one end of said main body to restrict the movement of said movable armature into the direction in which said movable contact approaches to said fixed contact; a sealing container housing said movable armature and said shaft therein in hermetically-sealed state and also holding said fixed terminal so that said fixed contact being exposed thereinside; a contact pressure spring consisting of a coil spring arranged within said sealing container, said main body of said shaft being inserted in said contact pressure spring, said contact pressure spring being configured to resiliently contact at one end thereof to said movable armature to urge said movable armature to approach toward said fixed contact and to give contact pressure between said movable contact and said fixed contact; a return spring consisting of a coil spring arranged within said sealing container, said return spring being configured to resiliently contact at one end thereof to said deterring part of said shaft to urge said shaft to move away from said fixed contact; an operation handle; a pressing means configured to press, in accordance with the operation of said operation handle, the other end of said main body of said shaft to move said deterring part of said shaft closer to said fixed contact; and a tripping means configured to make said movable contact and said fixed contact open by taking said pressing means away from said the other end of said main body of said shaft in case that an anomalous current flows through said movable contact and said fixed contact when they are contacted.