Thermally activated emergency electric switch

Details Thermally activated emergency electric switch Thermally activated emergency electric switch

1977-12-27

1979-09-25

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

200 6108, H01H 3776

Patent

active

041692543

ABSTRACT:
The manually actuable electric switch has a fusible element which melts on subjection to a predetermined temperature to discontinue the flow of electric current through the switch. The structure is incapable of operation on melting of the fusible element without replacement of the element, thereby preventing accidental reactivation of the switch prior to termination of the unusual thermal conditions causative of the melting of the element. A manually operable plunger normally used to open and close the switch is mechanically connected to the stem of the switch through the fusible element. Melting of the element severs the mechanical connection between the plunger and the switch.

REFERENCES:
patent: 2058288 (1936-10-01), Bamonte
patent: 2085386 (1937-06-01), Phillips et al.
patent: 2912535 (1959-11-01), Sullivan
patent: 3915236 (1975-10-01), Stichling

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