Short-circuiting device of an electrical installation and system for extinguishing an electrical arc that may appear in such an installation

A system for quenching an electric arc that can occur in an electrical installation, the installation including at least two electrical conductors, the system comprising:

• at least one device for detecting the electric arc on each conductor;
• at least one electrically isolating circuit breaker connected to the electrical conductors between the electrical installation and a power supply source of the electrical installation;
• a shorting device connected to the electrical conductors;
• an electronic device configured to control the shorting device so that the shorting device is in a state for setting up a short circuit between the electrical conductors when the electric arc is detected by the detection device, and configured to trip the at least one electrically isolating circuit breaker when the electric arc is detected by the detection device,
• wherein the shorting device includes
• at least two connection terminals, each configured to be connected to a respective electrical conductor;
• a parallelepipedic electromechanical block configured to set up a short circuit between the connection terminals;
• at least two resistors, one for each of the two connection terminals, each of the at least two resistors being configured to connect a corresponding one of the connection terminals to the corresponding electrical conductor, each of the resistors comprising a first connection end connected to the corresponding connection terminal and a second connection end configured to be connected to the corresponding electrical conductor,
• wherein each of the resistors has an impedance, and a variation in a value of the impedance is less than 1 mΩ for a temperature of the resistors of between 0° C. and 200° C.