PURPOSE: To remove a fixed contact from a conductive pin and break a cable way securely in a thermally actuated switch using a thermally actuated plate in case fusion of a contact or the like occurs.
CONSTITUTION: A closed container is composed of a cover 1 of metal, and a cover plate 5 welded at its aperture end surface, and a conductive pin 7 is electrically insulated and fixed gas-tightly to the cover plate 5. A fixed contact 8 is fixed to the conductive pin 7 by an easy-to-fuse material 9 which loses its fixture force at a higher temperature than an operation temperature of a thermally actuated plate 2. A spring 10 having a force to get the fixed contact 8 apart from the conductive pin 7 is also provided. One end of the thermally actuated plate 2 which operates at a predetermined temperature is fixed to the inside of the closed container, and a movable contact 3 is provided at the other end. The movable contact 3 and the fixed contact 8 are disposed to get in contact with or apart from each other. For emergency such as fusion of the contact, the easy-to-fuse material 9 loses its fixture force to get the fixed contact 8 apart from the conductive pin 7 to break a cable way securely.
MIZUTANI YASUKAZU
TOHO ISAO
KOSEKI HIDEKI
UBUKATA REIKO
UBUKATA SHINNOSUKE