Suitable for isolation with positive contact indication

Suitability for isolation is defined here by the mechanical reliability of the position indicator of the operating mechanism, where:
  • the isolation position corresponds to the O (OFF) position

  • the operating handle cannot indicate the "OFF" position unless the contacts are effectively open.

The other conditions for isolation must all be fulfilled:

  • locking in the open position is possible only if the contacts are effectively open

  • leakage currents are below the standardised limits

  • overvoltage impulse withstand between upstream and downstream connections.

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