Thermal protective switch

Details Thermal protective switch Thermal protective switch

1979-01-15

1981-03-10

Beha, Jr., William H.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337414, H01H 3760, H01H 3776

Patent

active

042557364

ABSTRACT:
A thermally sensitive switch is provided with two parallel lead wires or conductive members which are confined within a two section insulated housing. Electrical continuity between members is established by a conductive contact element which bridges the two conductive members to provide a continuous electrical path. The contact element is held in place by a temperature sensitive material which changes state at a predetermined temperature and by a spring element which exerts a force on the pellet through the contact element. When the temperature sensitive material changes state, the spring force drives the contact between the conductive members to effect a snap-action instantaneous interruption of the electrical circuit. The construction and assembly of the components provide for minimizing the production cost of the switch.

REFERENCES:
patent: 412845 (1889-10-01), Ely
patent: 2955179 (1960-10-01), Milton et al.
patent: 3301981 (1967-01-01), Urani
patent: 3827014 (1974-07-01), Wehl
patent: 3952274 (1976-04-01), Plasko
patent: 4135177 (1979-01-01), Kelley et al.
patent: 4145654 (1979-03-01), Grimm

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