Method for testing the functionality of the electromagnetic triggering of a switch, in particular a circuit breaker for low voltages and test circuit therefor.

摘要

The switching contacts are opened by a tripping shaft which is supported by a cam lock held under pre-tension and by an unlatched state of a tripping magnet (M). Current is triggered by passage of a winding (W) used as inductor (L) in a resonant circuit. The resonance frequency of the oscillating circuit (SKS) is detected by resonance circuit. The functioning of the tripping magnet is detected based on detected resonance frequency.