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What is the operating principle of LC1D electromagnetic contactor.

A contactor in which the force for the closing and opening of the main contacts is provided by an electromagnet.

Operating principle:
      When a voltage is applied to coils terminals
          - Electromagnetic force is generated
          - moving magnet is attracted towards fixed magnet
          - Contacts close
      When voltage is withdrawn
           - Electromagnetic force no longer exists
           - return springs push moving magnet back to initial position
           - Contacts open
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