公开(公告)号：US10553381B2

公开(公告)日：2020-02-04

申请号：US15001804

申请日：2016-01-20

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hyun-Tak Kim ,  Sungwoo Jo ,  Sun-Kyu Jung ,  Jin-cheol Cho

IPC: H01H47/26 ,  H02H3/08 ,  H02H5/04 ,  H01H47/32 ,  G05F5/00 ,  G08B21/18 ,  H01C7/00

Abstract: The present disclosure discloses an electrical switchgear configured to control an electro-magnet by using the electro-magnet, a critical temperature device, and an electro-magnet control unit without using a bimetal and a mechanical contact. The electro-magnet switches power applied through a power line in response to a flow of control current to a power device connected to a load side. In a critical temperature device, an output current value varies when a temperature of a heating wire, which is connected to the power line, exceeds a critical temperature by supply current flowing to the power device. An electro-magnet control unit, which is realizable with an SCR, allows a flow of control current of the electro-magnet to be generated or cut off in response to the output current value of the critical temperature device.