Transfer Switch Contactors

lanerd wrote:

D.E.Bishop wrote:
lanert, wouldn't the amperage rating be more important. Most relay contacts are rated in amps, the relay coils are rated in volts. So you probably need 120vac relays with 60 amp or better contacts.

But the relays are rated at 50 amps in either 120v or 240v....no amperage is specified. Plus amperage is applied with the load, so initial connection would be almost 0 amps....only after you start turning things on will there be current draw. If the relay is rated for 50 amps (max in our motorhomes), either relay (120 or 240) should work.

Since using either 15 amp, 30 amp or 50 amp services.....all are 120v. That tells me that any voltage over it's rated capacity, the relay will fail. So if I have a 240 v relay and I only apply 120 volts to it, I would think it would work just fine. So far I haven't found or heard where it won't.

My problem is that I can purchase a 240v relay but can't find a 120v anywhere. So my question is can I use a 240v relay?

Ron

Where and Why do you think there will be NO LOAD???? IF you have the roof AC's on and other appliances. THAT Load(about 35 to 50 amps) will be causing the contac points to arc when the appropriate relay opens or closes. THAT is what causes Transfer Boxes to fail(usually). Doug