Device for monitoring a neutral and earth break, and electrical switchgear apparatus comprising such a device.

摘要

A second voltage detection system (14) can be connected between a phase conductor (Ph) and an earth conductor (PE) in order to supply a processor (16) with a second signal (V2) representing a voltage between the phase and earth. A third detection system (15) can be connected between a phase conductor and a neutral conductor (N) in order to supply the processor with a third signal (V3) representing a voltage between the phase and neutral. The processor generates a broken neutral and/or broken earth connection signal (90, 91) as a function of the signals from the three voltage detection systems. The monitoring device (1) includes a first voltage detection system (13) which can be connected between a neutral conductor and an earth conductor in order to supply the processor with a first signal (V1) representing a voltage between neutral and earth. An Independent claim is also included for an automatic electrical disconnection device