> >My major design constraint is cheap. I can buy a 10 amp rated SPST > >relay for $0.50 in quantity. > Good idea - if it cuts in and out in a thermostatic way, you could > reach its end of life very quickly. 50 cents isn't cheap if you > have to factor in product recalls and field service... As an > aside, do you have any particular requirements for radiated noise? I am just getting more familiar with FCC radiated noise standards, and am in the dark about IEC radiated noise standards. What kinda gotchas have gotten you? -- Lawrence Lile Download AutoCad blocks for electrical drafting at: http://members.sockets.net/~llile/index.htm