Thermally responsive switch

H - Electricity – 01 – H

Patent

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Details

H01H 37/54 (2006.01)

Patent

CA 2660140

This invention provides a thermally reactive switch (1) comprising a hermetically sealed vessel (2) comprising a metallic housing (3) and a lid plate (4), electroconductive terminal pins (10A, 10B) fixed in a hermetically sealed state in the lid plate (4), a fixed contact (8) fixed in the electroconductive terminal pin (10A), a thermally reactive plate (6), one end of which is electroconductively connected and fixed to the inner face of the hermetically sealed vessel (2) and undergoes reversion of the inflection direction at a predetermined temperature, and a movable contact (7) fixed to the other end of the thermally reactive plate (6). The movable contact (7) and the fixed contact (8) comprise a silver-cadmium oxide-base contact. A gas containing not less than 50% and not more than 95% of helium is sealed within the hermetically sealed vessel (2) so that the pressure is not less than 0.38 atm and not more than 0.68 atm at room temperature.

La présente invention concerne un commutateur réagissant à la chaleur (1) comportant un corps hermétiquement étanche (2) comportant un boîtier métallique (3) et une plaque de couvercle (4), des broches-bornes électro-conductrices (10A, 10B) fixées dans un état hermétiquement étanche dans la plaque de couvercle (4), un contact fixe (8) fixé dans la broche- borne électro-conductrice (10A), une plaque réagissant à la chaleur (6), dont une extrémité est en liaison électro-conductrice et fixée à la face intérieure du corps hermétiquement étanche (2) et est soumise à une inversion de la direction de flexion à une température prédéterminée, et un contact mobile (7) fixé à l'autre extrémité de la plaque réagissant à la chaleur (6). Le contact mobile (7) et le contact fixe (8) comportent un contact à base d'oxyde d'argent-cadmium. Un gaz contenant une quantité d'hélium comprise entre 50% et 95% est scellé dans le corps hermétiquement étanche (2) de sorte que la pression est comprise entre 0,38 atm et 0,68 atm à la température ambiante.

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