Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1990-01-22
1991-05-07
Broome, Harold
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337 4, 337403, H01H 3776, H01H 8500
Patent
active
050140361
ABSTRACT:
A thermal and current sensing switch which brakes an associated electric circuit when an overcurrent is supplied to the electric circuit or the temperature of the electric apparatus rises beyond a predetermined temperature. The thermal and current sensing switch comprises a housing, fixed conductors fixed to the housing with the base ends thereof extended within the housing; a current fuse placed in the housing with the opposite terminals thereof in contact with the fixed conductors; a first spring biasing the current fuse away from the fixed conductors, a second spring pressing the current fuse against the fixed conductors against the force of the first spring, and a temperature sensing element provided between the housing and the second spring. When the ambient temperature rises beyond a predetermined temperature, the temperature sensing element reduces the force of the second spring to allow the first spring to separate the current fuse from the fixed conductors to break the electric circuit. The current fuse and the temperature sensing element are isolated electrically and thermal from each other so that the same are able to function independently.
REFERENCES:
patent: 3828289 (1974-08-01), Hickling
patent: 4292616 (1981-09-01), Andersen
patent: 4380001 (1983-04-01), Kasamatsu
Broome Harold
Orient Co., Ltd.
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