| 摘要 |
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. |
