Thanks Nomel: So if I understand you right, a contactor is essentially a mechanical relay? Or does a contactor offer something unique in terms of protection that sets it in a different category from a garden variety electromechanical relay? Thanks Madhu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu