Thermal Fuse

Details Thermal Fuse Thermal Fuse

1983-07-18

1985-01-15

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337166, 337296, 337297, H01H 3776, H01H 8504

Patent

active

044941048

ABSTRACT:
A fuse for responding to external temperatures to interrupt an electrical circuit, for example for interrupting a telephone battery feed in response to the temperature of a battery feed resistor, comprises a substrate carrying a pair of electrodes defining a gap between them. A fuse link, for example a gold strip, extends across the gap to interconnect the electrodes electrically. A film of solder overlies the fuse link and overlaps at least partly at least one of the electrodes. The fuse link is soluble in the molten solder so when the temperature of the solder paste exceeds its melting point, it melts, dissolves the fuse link, and retreats from the gap to sever the electrical connection between the electrodes.
The fuse and a resistor whose temperature is to be detected, may be provided on a single substrate.

REFERENCES:
patent: 3271544 (1966-09-01), Ragan
patent: 3386062 (1968-05-01), Kozacka et al.
patent: 3763454 (1973-10-01), Zandonatti

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