Patent ID: 7639471
Filing Date: 2009-12-29
Classification: H01H

Abstract:
1. Electrical relay circuit with a self-retaining relay, comprising a load circuit with a series connection of a first generator, a load component and a relay switch of the relay, wherein the relay switch has a closed position in which the load circuit is closed, with the closed position belonging to a currentless state of the relay, wherein the relay switch is pre-stressed towards the closed position, and wherein the relay switch has a magnetized position in which the load circuit is broken, with the magnetized position belonging to a current-carrying state of the relay, further comprising an auxiliary circuit with a second generator for providing a control signal, wherein by means of the control signal the relay switch can be switched into the magnetised position, and wherein the auxiliary circuit keeps the relay switch in the magnetized position after the control signal is over, wherein the first generator is connected to a series connection of the relay and a constant current source in both positions of the relay switch, wherein the constant current source allows the flow of a constant current through it when in an activated state, wherein the constant current source is connected to an activation circuit comprising the second generator, wherein the constant current source can be put into the activated state by the activation circuit when the relay switch is in the closed position, and wherein the constant current source is further connected to a holding circuit wherein the holding circuit is activated by the constant current through the constant current source, wherein the activated holding circuit keeps the constant current source in the activated state when the relay switch is in the magnetised position.