Circuit for determining residual operating life of electrical switching equipment

摘要

The circuit has at least one detection arrangement (2) between the opening and closing positions of a movable switch contact (10) for detecting an artificial criterion for the type of switch-off. The circuit also has an electronic evaluation unit (4) for the detected criterion, a memory unit (6) for the individual artificial criteria and a display (8) for indicating the state of wear and the anticipated residual operating life of the switching device.