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What is the part number for the L 63 normally closed interlock used in Vacuum size 5 and 6 contactors and starters?

The style number to be ordered for the coil clearing interlock(L-63) is 578D461G03. This interlock is for the size 5 and 6 vacuum contactor and starters.

What is the purpose of the L 63 interlock used in vacuum size 5 and 6 contactors and starters?