I've used an SSR on a reliability test fixture to cycle power to a 60W switcher, ran for a year or so turning the switcher on and off every 15 min; had no problems. Kirk > > Is it a bad thing to use a solid state relay to control the power to a > switching power supply or is a mechanical relay a better device > > > -Ash -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.