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What are the different sorts of connectors (plugs and sockets)?

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Industrial power connectors are colour coded as follows:

  • Red for 3-phase 380-415V
  • Blue for single phase 220-240V
  • Yellow for single phase 110-120V

3-phase connectors can have four pins (3 phases + earth) or five pins (3 phases + neutral + earth).  They are supplied in several current ratings, the most used being 16A and 32A per phase.  Boosters now use only 5-pin connectors rated at 16A per phase.