Polarized DC contactors

Details Polarized DC contactors Polarized DC contactors

1981-06-18

1983-03-08

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Plural independently operable switches

200147A, 361210, H01H 900

Patent

active

043762719

ABSTRACT:
Means for causing the properly-polarized one of a pair of series-connected DC contactors to open before the other, depending upon the direction of load current flow. Load current is caused to link the magnetic circuit constituted by a contactor coil, frame and armature; with current flowing in a first direction, the linking has an additive effect, strengthening the MMF in the magnetic circuit. When current flows in the opposite direction, the MMF is weakened which allows the contactor to open more quickly.

REFERENCES:
patent: 2650966 (1953-09-01), Yingst

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