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Old 08-12-2017, 10:20 AM
Rick Kellner Rick Kellner is offline
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SCR question

I'm trying to figure out if a SCR unit designed for 480 volts could be used in a 240v circuit, assuming the amperage ratings are sufficient, and that they are all single phase units.

Is it OK to use less than the specified power level, as long as you don't exceed the voltage ratings? Maybe there is a fundamental principle of electrical theory that escapes me on this one.

Any dialogue to be had?
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Old 08-12-2017, 10:49 AM
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Pete VanderLaan Pete VanderLaan is offline
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Steve had always said that a transformer could not discern the difference between 480 and 240. Because of that, he would get 480 transformers, and run the 240 in. In turn the taps on the transformer would be halved as well so we had two 120V taps and one 60 V. With 60V in series and 20V elements in banks of 3 , it worked like a charm with the downside being that the 20V element was pretty fragile We never accessed 480V SCRs since there was no salvage market.

It may be that SCR's are smarter.
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Old 08-12-2017, 11:30 PM
Steve Stadelman Steve Stadelman is offline
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Older units especially had an internal transformer that pulled off one leg of supplied voltage for internal controls. Sometimes you can change out that control transformer to change working voltage for the unit. However you would have a hard time and may still break it. And that's not even addressing single phase, three phase two leg and three phase three leg operation. They are so reasonable these days you are probably better off buying new.
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