Relay circuit and relay therefor

Details Relay circuit and relay therefor Relay circuit and relay therefor

1982-05-19

1985-07-30

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361102, 361187, 361194, 335256, 335268, H02H 308

Patent

active

045325707

ABSTRACT:
An electrical circuit, controlled by an electromagnetic relay, comprising an electromagnetic relay having relay contacts for controlling current flow to a load in use, and a relay winding which, when energized, causes closure of said relay contacts. First manually operable switch means is provided for energizing said relay winding, and a feed connection is provided from said relay contacts to said relay winding whereby said winding is energized while said contacts are closed. A second manually operable switch means for short circuiting said relay winding is provided to permit said relay contacts to open. An overload protection winding is physically associated with the relay winding and connected in series with the contacts, said overload protection winding being such that when the current flowing therethrough exceeds a predetermined value the electromagnetic effect generated opposes the electromagnetic effect of the relay winding to a sufficient extent to permit said relay contacts to open.
The invention further relates to an electromagnetic relay.

REFERENCES:
patent: 3060352 (1962-10-01), Wiseman
patent: 3906476 (1975-09-01), Yonezu
patent: 4027208 (1977-05-01), Look
patent: 4292611 (1981-09-01), Bresson et al.

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