Electric switch limiter pole and DC electric switch comprising such a limiter pole

A high-voltage multipole DC electrical switch, comprising:

• a moulded housing including a main body that is divided into a plurality of internal compartments, each associated with one pole of the switch, and a switching mechanism, wherein one of the poles of the switch is formed by a limiter pole, the limiter pole comprising:
• a compartment in which an input terminal and an output terminal for a direct electric current are provided,
• wherein the limiter pole for the multipole DC electrical switch comprises a first electrical contact connected to the input terminal and a second electrical contact connected to the output terminal,
• third and fourth electrical contacts connected to one another in series, the third and fourth contacts being capable of being moved simultaneously relative to the first and second electrical contacts, respectively, between a closed position, in which the first and third contacts and the second and fourth contacts make contact with one another so as to allow the direct electric current to flow between the input terminal and the output terminal, and an open position, in which said contacts are located away from one another, interrupting the flow of the current between the input terminal and the output terminal, and
• wherein the limiter pole comprises a first electric arc formation chamber in which the first and third electrical contacts are placed, a second electric arc formation chamber in which the second and fourth electrical contacts are placed, and first and second electric arc extinguishing chambers which are associated with the first and second electric arc formation chambers, respectively,
• the compartment of which is formed by one of the internal compartments of the main body and the contacts of which can be separated by the switching mechanism, wherein the switch comprises at least one conducting pole provided with an input terminal and an output terminal, with a first series of electrical contacts that are connected to the input terminal and with a second series of electrical contacts that are connected to the output terminal, the first and second series of electrical contacts being capable of being separated by the switching mechanism, and wherein the switching mechanism is configured to separate the contacts of the one or more conducting poles before the contacts of the limiter pole.