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Variac primary voltage rating 220 - can it be used on 110?

 
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Kristi27



Joined: 20 Nov 2007
Posts: 1
Location: Boston
PostPosted: Tue Nov 20, 2007 11:32 pm    Post subject: Variac primary voltage rating 220 - can it be used on 110? Reply with quote
Variac/powerstat/autotransformer etc.

Can I successfully use one rated at 220/240, to vary a 110/120 volt line?

(60HZ, single phase)

looking to lower 128 overvoltage to a more reasonable 120 or so.

tia!
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden
PostPosted: Wed Nov 21, 2007 12:45 pm    Post subject: Reply with quote
Yes indeed, just make sure that you don't overload the variac. Remember that the current rating remains unchanged when you run it from a lower mains voltage, but you should not load it with more than half its rated power.
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PostPosted: Wed Nov 21, 2007 6:22 pm    Post subject: Reply with quote
Thanks!
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PostPosted: Mon Dec 03, 2007 5:41 pm    Post subject: Reply with quote
torbjorn wrote:
Yes indeed, just make sure that you don't overload the variac. Remember that the current rating remains unchanged when you run it from a lower mains voltage, but you should not load it with more than half its rated power.
why 1/2 rated power? you tell her that the current remains the same automatically means half power.
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