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

Monitoring device for monitoring a neutral and an earth conductor comprising:

• processing means to supply a loss of neutral detection signal,
• first voltage detection means designed to be connected between a neutral conductor and an earth conductor to supply a first signal representative of a voltage between neutral and earth to said processing means,
• second voltage detection means designed to be connected between a phase conductor and the earth conductor to supply a second signal representative of a voltage between phase and earth to said processing means, and
• third voltage detection means designed to be connected between the phase conductor and the neutral conductor to supply a third signal representative of a voltage between phase and neutral to said processing means,
• the processing means supplying a loss of neutral and/or loss of earth signal according to the values of said first signal supplied by said first detection means, of said second signal supplied by said second detection means, and of said third signal supplied by said third detection means.