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Author Topic: powerstat 1226 variac  (Read 760 times)
KB0KYT
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Posts: 3




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« on: November 20, 2017, 07:40:45 PM »

I have a powerstat 1226 autotransformer
I am feeding in 120 volts ac and as i turn it up im getting over 200 volts ac out.
Is that normal?
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KD0REQ
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Posts: 2023




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« Reply #1 on: November 20, 2017, 08:27:47 PM »

yes.  page 76 of the archived catalog

http://lcweb2.loc.gov/master/mbrs/recording_preservation/manuals/Powerstat%20Catalog%20P258G.pdf

shows 0-120 in and 0-280 out.

Google is your friend. I would paste a snip, but that's not site-legal, probably for storage and bandwidth reasons.
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KB0KYT
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Posts: 3




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« Reply #2 on: November 20, 2017, 09:29:43 PM »

ok thanks
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W6EM
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Posts: 1667




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« Reply #3 on: November 24, 2017, 10:49:37 AM »

Since it's got such a wide voltage range, it's a "half-tapped" auto transformer. The output current rating is therefore only 120/280 or 0.428 times the input current rating for such transformers. 

Normal, full-winding variacs are rated in amperes, and input current ratings are usually equal to output current ratings, so be careful.

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