Normally closed AC relay

Details Normally closed AC relay Normally closed AC relay

1991-11-04

1992-10-13

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Polarity-responsive

335 78, 335128, H01H 5122

Patent

active

051554585

ABSTRACT:
A normally closed AC relay having a stator core with primary and shaded poles, an operating coil mounted on the stator core to magnetically attract a pivotal clapper in one pivotal direction thereof toward the stator pole against the bias of a return spring, the clapper and/or stator core having a reduced transverse section in the magnetic loop of the operating coil with a cross-sectional area equal to or less than that of the primary pole to control the magnetic field across the working air gap by magnetic saturation of the reduced section.

REFERENCES:
patent: 4498065 (1985-02-01), Nagamoto et al.
patent: 4691181 (1987-09-01), Katsutani et al.
patent: 4937544 (1990-06-01), Mueller

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