Relays

M

Thread Starter

Mac or Cathy

Is anyone aware of a solid state relay with a normal closed output rated to control a single phase 440 VAC, 1 amp. load?

As an alternate solution, has anyone had any experience with placing two relays with 220 VAC rated outputs in series to control the 440VAC? Transient voltage suppressors would be installed
across the outputs of each relay to protect the device.

W. M. Southwell
 
R

Ralph G. McDonald, P.E.

You might check out Opto22. They have some solid state relays rated up to 575 volts and I think up to 10 amps

Their power relays are at www.opto22.com/products/hardware/ssrs.htm#Power

I would not try to put two 230 volt devices in serries unless you can insure that both devices will turn on and off at the same time.

If they do not the last device to switch will see the full 460 volts on its load terminals

Ralph
 
D

Daniel Boudreault

Hello W.M.,

> Is anyone aware of a solid state relay with a normal closed output
> rated to control a single phase 440 VAC, 1 amp. load?

Check out Crydom.

> As an alternate solution, has anyone had any experience with
> placing two relays with 220 VAC rated outputs in series to control
> the 440VAC? Transient voltage suppressors would be installed
> across the outputs of each relay to protect the device.

Bad Idea. You will burn the slower switching ssr out.

Dan B.
 
So if you ensure that both relays are switched at the same time, this should solve your problem??? I don't think so....
Putting 2 relay outputs (contacts) in series doesn't help you AT ALL, how will it change the voltage drop across the contacts or between contacts and neutral???

Cristian
 
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