Thermal protective switch

Details Thermal protective switch Thermal protective switch

1977-05-02

1979-01-16

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337408, H01H 3776

Patent

active

041351770

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: 3291945 (1966-12-01), Merrill et al.
patent: 3820050 (1974-06-01), Tyler et al.
patent: 3952274 (1976-04-01), Plasko
patent: 3956725 (1976-05-01), Merrill et al.

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