Patent ID: 6738246
Filing Date: 2004-05-18
Classification: H01H,H02H

Abstract:
An electrical switching device comprising:a microrelay switch which is arranged in a current path and has microrelay cells connected in series as a voltage divider and connected in parallel as a current divider: a current sensor which detects a current flowing in the current path; an evaluation device for receiving and evaluating current signals detected by the current sensor and for forming a tripping signal, which acts on the microrelay switch, if the current being carried in the current path exceeds a threshold value; and a short-circuit current limiter arranged in the current path such that the short-circuit current limiter is connected in series with the microrelay switch; wherein the switching device is designed such that the microrelay switch opens in response to the tripping signal for small overcurrents that are greater than the threshold value, and, in the event of large overcurrents, the short-circuit current limiter limits these overcurrents to currents which can be interrupted by the microrelay switch.