Line safety switch or circuit-breaker comprise input terminal and output terminal, which are connected by current path, where device measures phase of alternating current

摘要

The line safety switch or circuit-breaker (10) comprises an input terminal (12) and an output terminal (14), which are connected by a current path. A device (26) measures a phase of an alternating current between one point in current path and one reference point. The electronic evaluation device (28) is arranged for actuating an actuator element (22) on a contact point (16).