Combination fuse, especially for fire protection installations

Details Combination fuse, especially for fire protection installations Combination fuse, especially for fire protection installations

1977-02-07

1978-07-25

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

169 42, H01H 3776, A62C 3730

Patent

active

041032721

ABSTRACT:
A combination fuse, especially for fire protection installations. The fuse comprises two metal pieces bonded together by means of a fusible metal which during normal conditions prevents a trip mechanism to be operated. At a temperature above normal ambient temperature the fusible metal loses its bonding effect and permits operation of the trip mechanism. The combination fuse further comprises a heat dissipating means adapted to dissipate heat for raising the temperature of the fusible metal so as to release the combination fuse. The heat dissipation is initiated in response to a signal generated by the sensing of local or remote ambient conditions. The heat dissipating means is an electric resistance element incorporated in a circuit which is electrically separated from the two metal pieces and other components of the fire protection installation. The resistance element is connected in the circuit by members which upon tripping of the combination fuse, i.e., when the fusible metal loses its bonding effect and the two metal pieces are pulled apart by the trip mechanism, ensure the resistance element is disconnected from the circuit for the breaking thereof.

REFERENCES:
patent: 1167481 (1916-01-01), Copeland
patent: 3613795 (1971-10-01), Amicone

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