Contact mechanism for electronic overload relays

Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Polarity-responsive

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335128, 335124, H01H 5122

Patent

active

059949872

ABSTRACT:
An improved trip mechanism for an overload relay includes a housing, a bistable armature mounted in the housing on a pivot for pivotal movement between two stable positions and fixed contacts within the housing. Moveable contacts are located within the housing and springs engage the moveable contacts and urge the same toward the fixed contacts to establish an electrical conducting relationship therebetween. Moveable, contact engaging posts are located on the armature and opposite of the springs for engaging the moveable contacts and moving them away from the fixed contacts against the bias of the springs for one of the two stable positions and for effectively disengaging the moveable contacts to allow the springs to move the moveable contacts into the electrical conducting relation. The relay further includes a latch surface carried by the housing and a spring mounted on the housing and having a latch finger for engaging the latch surface and retaining the armature in one of its two positions.

REFERENCES:
patent: 3925742 (1975-12-01), Muench
patent: 4181907 (1980-01-01), Esposito et al.

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