Thermal switch

Details Thermal switch Thermal switch

1981-10-16

1983-11-08

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337371, 337372, H01H 3754

Patent

active

044145292

ABSTRACT:
A thermal switch comprising a plurality of outer terminals respectively having a fixed contact, a movable contact spring divided into a plurality of mutually parallel contact spring parts each having a movable contact for contacting with and separating from the fixed contact and a plurality of bimetals respectively operating at differently set temperatures and provided so as to independently actuate the respective contact spring parts, whereby resetting-type contacts are reliably opened and closed in response to fluctuations in the atmospheric temperature through one of the bimetals which has a relatively lower first set-temperature and, when the particular bimetal of the relatively lower first set-temperature fails to operate and the atmospheric temperature further rises, non-resetting-type contacts are reliably opened through the other bimetal having a relatively higher second set-temperature.

REFERENCES:
patent: 2727962 (1955-12-01), Vaughan
patent: 2864918 (1958-12-01), Epstein
patent: 4149138 (1979-04-01), Pevzner et al.

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