> That doesn't address my contact rating issue, but it does help > contact life since the contacts don't spend as much time arcing If the timing is reasonably consistent can you apply zero-crossing detection/prediction so the contacts open/close at low V /low I points ? Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .