Patent ID: 7639107
Filing Date: 2009-12-29
Classification: H01H

Abstract:
1. An overcurrent relay comprising: a calculating unit that outputs a trip signal or a reset signal to instruct supply and non-supply of power based on current information on a main circuit current supplied to a load; a power source unit that supplies power to a coil based on the trip signal or the reset signal when the trip signal or the reset signal is input; an electromagnet unit that performs a trip operation to move a movable iron core from a position of a stationary state to a position of a trip state and a reset operation to move the movable iron core from the position of the trip state to the position of the stationary state when the power is supplied from the power source to the coil based on the trip signal or the reset signal; and a contact point mechanism unit that opens a usually-closed contact point through the trip operation of the movable iron core and closes the usually-closed contact point through the automatic or manual reset operation, wherein the movable iron core arranged on sides of the coil and forms a magnetic circuit, and wherein the contact point mechanism unit includes: