Gas-filled spark gap

A gas-filled spark gap (2) for protection of an electric installation, including:

• a. an electrically-insulating body (10);
• b. two electrodes (11;
• 12) fixed to the electrically-insulating body and spaced from one another in a main direction;
• c. an inter-electrode space (20) formed in the electrically-insulating body between the two electrodes, the inter-electrode space being closed in gas-tight manner;
• d. two connecting terminals (31;
• 32) intended to enable electrical connection of said gas-filled spark gap to the electric installation, the two connecting terminals being electrically-connected to a respective one of said two electrodes;
• e. the inter-electrode space including a diverter channel (22) defining a propagation trajectory (T) for an electric arc;
• a cross-section of the diverter channel (22) being between 2 and 8 mm2, the diverter channel extending transversely or obliquely to the main direction over at least a part of a length of the diverter channel;
• and
• f. a gas trapped in the inter-electrode space, the gas being selected from argon Ar, neon Ne, nitrogen N2, hydrogen H2, helium He and mixtures thereof.