H - Electricity
01
H
306/117
H01H 85/04 (2006.01) H01H 37/76 (2006.01) H01H 85/046 (2006.01)
Patent
CA 1187917
THERMAL FUSE Abstract of the Disclosure 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. - i -
432528
Adams Thomas
Nortel Networks Limited
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