Electromagnetic relay having an improved terminal piece structur

Details Electromagnetic relay having an improved terminal piece structur Electromagnetic relay having an improved terminal piece structur

1990-07-20

1993-06-01

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Polarity-responsive

335 78, H01H 5122

Patent

active

052163970

ABSTRACT:
An electromagnetic relay comprising a fixed end terminal piece including a main part, a narrowed portion extending therefrom, and a relatively broader mounting portion formed at a free end of the narrowed portion and carrying a fixed contact thereon. Since a strong magnetic field in generated by the concentration of electric current in the narrowed portion, and an electric arc generated across the contacts is subjected to a corresponding electromagnetic force according to Fleming's left-hand rule, the arc is either eliminated or deflected from the shortest path between the two contacts, and the welding together of the two contacts is effectively prevented. Also, the durability of the contacts is substantially improved through deflection or elimination of the arc.

REFERENCES:
patent: 4688010 (1987-08-01), Nobutoki et al.
patent: 5041870 (1991-08-01), Imai et al.

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