Thermal switch with a vitreous metal alloy switching element

Details Thermal switch with a vitreous metal alloy switching element Thermal switch with a vitreous metal alloy switching element

1978-12-20

1981-04-21

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With longitudinally expansible solid element

337291, 75123B, 75123D, 751755, H01H 6104, H01H 6106

Patent

active

042635730

ABSTRACT:
Thermal switch, including a switching element formed of a coherently structured vitreous metal alloy. The switching element being in a vitreous-amorphous state and having a higher strength at a lower first temperature range, and in a crystalline state and having a lower strength at a higher second temperature range. A tensioning device cooperating with the switching element for exerting a force thereon which is sufficient to break the switching element in the crystalline state and insufficient to break the switching element in the vitreous amorphous state. A device for triggering a switching process in response to the breaking of the switching element in the vicinity of a transition from the first to the second temperature range. An exchangeable cassette assembly for housing the switching element, and a method for protecting circuits against overcurrents using the thermal switch.

REFERENCES:
patent: 3559120 (1971-01-01), Myers
patent: 4085396 (1978-04-01), Augis et al.

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