Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – With bimetallic elements
Patent
1988-09-28
1989-06-27
Broome, H.
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
With bimetallic elements
337347, 337368, H01H 6108, H01H 3712, H01H 3754
Patent
active
048433632
ABSTRACT:
This invention relates to a three-phase thermal protector having two pairs of fixed and movable contacts for opening and closing the neutral of wye-connected phase windings of a three-phase induction motor. The protector further includes a header plate having two terminal pins secured by an insulating sealant material respectively, a support plate secured to the header plate, an elastic member disposed so as to be approximately parallel to the support plate, the elastic member having two ends, one of which is secured to the support plate, a thermally responsive element secured at one end thereof to the other end of the elastic member, the thermally responsive element carrying the movable contacts and moving and returning with snap action in response to temperature change, a pivot mounted on a stationary member either at the header plate side or at the support plate side so that the surface of connecting portions of the thermally responsive element and the elastic member is engaged therewith, and an operative temperature calibrating mechanism provided on the support plate for exerting a contact pressure between the movable and fixed contacts.
Iyoda Syozo
Mizutani Yasukazu
Ubukata Susumu
Broome H.
Ubukata Susumu
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