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What is a holding circuit interlock for?
Issue:
What is the function for the holding contact?

Product Line:
NEMA and Definite Purpose Contactors and Starters

Environment:
Type S contactors and Starters

Resolution:
The holding circuit interlock is a normally open auxiliary contact on magnetic starters or contactors. Used in three wire control schemes with momentary inputs. It closes when the coil is energized to form a holding circuit for the starter or contactor after the ``Start`` button or input has been released.

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