Overload protective apparatus utilizing a bimetal

Details Overload protective apparatus utilizing a bimetal Overload protective apparatus utilizing a bimetal

1993-10-13

1996-03-05

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

337377, 337102, 337380, H02H 504, H01H 3714

Patent

active

054972868

ABSTRACT:
An overload protective apparatus has fixed contacts connected to at least one pair of fixed terminals secured on the bottom of a case, a dish-shaped polymetallic element, e.g., a bimetal or trimetal having movable contacts bonded thereon so as to oppose the fixed contacts, and an adjusting bolt supporting a central portion of the polymetallic element for maintaining the polymetallic element at a position separate from the bottom of the case, wherein the polymetallic element and the adjusting bolt are accommodated in the case. The polymetallic element used herein is constructed to make a current density around bonding portions for the movable contacts higher than other regions, such that portions around the movable contacts are more susceptible to rupture when an abnormal current flows through the polymetallic element. The polymetallic element is also constructed to prevent degradation of the spring constant thereof.

REFERENCES:
patent: 5235308 (1993-08-01), Shimada et al.

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