US 12,224,145 B2
Protection device
Toshikazu Yamaoka, Tokyo (JP); Hajime Takahashi, Tokyo (JP); and Katsuaki Suzuki, Tokyo (JP)
Assigned to Littelfuse, Japan G.K., Tokyo (JP)
Filed by Littelfuse, Japan G.K., Tokyo (JP)
Filed on Sep. 22, 2022, as Appl. No. 17/950,555.
Claims priority of application No. 2021-155416 (JP), filed on Sep. 24, 2021.
Prior Publication US 2023/0097068 A1, Mar. 30, 2023
Int. Cl. H01H 71/16 (2006.01); H01H 71/08 (2006.01)
CPC H01H 71/16 (2013.01) [H01H 71/08 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A protection device comprising:
a fixed terminal;
a movable arm comprising a movable arm end;
a bimetallic member located either above or below the movable arm, the bimetallic member comprising a bimetallic member end; and
a casing to accommodate the fixed terminal, the movable arm, and the bimetallic member; wherein the bimetallic member end applies a force to the movable arm end, thereby holding the movable arm end in contact with the fixed terminal;
the bimetallic member further comprising a weakened portion adapted to cause the bimetallic member to fail in an open state after a predetermined number of state changes, whereby the bimetallic member can no longer hold the movable arm end in contact with the fixed terminal.