Minimum voltage or loss voltage shunt trip device for a circuit breaker, associated assembly and process

Minimum voltage or loss voltage shunt trip device for a circuit breaker, the trip device comprising:

• a first terminal and a second terminal for application of an input voltage (U) between them;
• a loading block, electrically connected between the first terminal and the second terminal, comprising a load set up to actuate an opening or a closing of the circuit breaker by means of a mechanical actuator;
• and
• a protection module, comprising:
• a thyristor for protection against over-voltages, electrically connected between a first intermediate point and a second intermediate point;
• and
• a varistor, electrically connected between the second intermediate point and a third intermediate point, in series with the thyristor for protection against over-voltages, the thyristor for protection against over-voltages and the varistor being in parallel with the loading block;
• a first capacitor, belonging to the protection module, electrically connected in parallel with the varistor;
• a fusible element and a first resistive wire in series with each other, electrically connected between the first terminal and the protection module, the first resistive wire having a resistance higher than or equal to 0.5Ω;
• and
• a second resistive wire, having a resistance higher than or equal to 0.5Ω, electrically connected between the protection module and the second terminal.