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What is meant by interlocking function of the PK Pratika interlocked switch socket.

The PK Pratika interlocked switch socket device allows closure of the main switch and, subsequently, the power supply only when the plug is fully inserted in the socket, and when complete mechanical and electrical connection has occurred between the sleeves and pins. 

In interlocking function , the Plug removal is possible only when the switch is in the ‘off’ position.
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