Limit switches control at the lower and upper limits of travel prevents over travel. We recommend that these switches remain adjusted as shipped. Additional limit switches may be added for customer purposes and can be used to control of auxiliary circuits as
required, Order Auxiliary Switch Kit P/N 964-0057-S from ISE for this purpose. The kit includes (1) cam and switch for mounting on the same shaft as the standard switches. Switch kit is meant for our motor operated Variac transformers only.