Normally open, thermal sensitive electrical switching device

Details Normally open, thermal sensitive electrical switching device Normally open, thermal sensitive electrical switching device

1977-05-31

1978-04-11

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With fusible, combustible or explosive material

337409, H01H 3776

Patent

active

040841472

ABSTRACT:
A temperature sensitive normally open electrical switching device has a pair of normally isolated current carrying leads. A casing defines a central cavity and encloses first and second electrodes which are electrically connected to separate ones of the leads. An electrically conductive, fusible pellet is positioned in the cavity and melts at predetermined temperature to form an electrically conductive path between the electrodes. A spring and a nonconductive spacer apply a force to the pellet which will cause the pellet to collapse once the pellet material is fused regardless of the formation of an oxide layer on the pellet surface.

REFERENCES:
patent: 2934628 (1960-04-01), Massar et al.
patent: 3180958 (1965-04-01), Merrill

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