公开(公告)号：US20170110279A1

公开(公告)日：2017-04-20

申请号：US15392192

申请日：2016-12-28

Applicant: Littelfuse, Inc.

Inventor： Wen Yang ,  Hailang Tang ,  Hongbing Liu

IPC: H01H85/02 ,  H01C1/14 ,  H01H85/04 ,  H01C7/112 ,  H01C7/12

CPC classification number: H01H37/761 ,  H01C7/10 ,  H01C7/102 ,  H01C7/12 ,  H01C7/126 ,  H01H9/32 ,  H01H61/02 ,  H01H2037/762

Abstract: Exemplary embodiments of the present invention are directed to a circuit protection device, A circuit protection device may comprise a housing defining a cavity and a metal oxide varistor (MOV) disposed within the cavity. The circuit protection device may further comprise a first terminal electrically attached at a first end to the MOV by solder and extending outside of the housing at a second end. An arc shield is disposed within the housing between the first end of the first terminal and at least partially over the solder. The circuit protection device may further comprise a spring configured to bias the arc shield against a micro switch having an indicator portion disposed at least partially outside of the housing. When a voltage surge condition occurs, the MOV changes from a non-conductive state to a conductive state and current flows between the first terminal and a second terminal where the heat generated by the current flowing through the varistor melts the solder and the first end of the first terminal electrically separates from the varistor.