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Old 24th September 2009, 07:04 PM   #1
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Default Using 230v Transformer with 120v Mains

Sorry for the simple question, but I've done quite a bit of searching around & haven't found what I'm looking for....

If I have a power transformer that is labelled with a 230v primary & 46v-0-46v center tap secondaries, can I assume that it is useable with US 120v mains? The output will instead be more like 23v-0-23v, right? Does the current capacity of the primary go up & the secondaries go down in this scenario? If there's a link that you can point me to, that's good to. Thanks!
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Old 24th September 2009, 07:16 PM   #2
paulb is offline paulb  Canada
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Yes, it should be usable. The current capability is probably limited by its windings so in general won't increase - thus the transformer VA rating would be halved.
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Old 24th September 2009, 07:21 PM   #3
Spiny is offline Spiny  United Kingdom
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My understanding is it will work with reduced output voltage.

However you must not exceed the rated output current. If it is 2 amps at 46 volts then 2 amps at 23 is the max. This is down to the guage of wire used for the windings.
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Old 24th September 2009, 09:46 PM   #4
luka is offline luka  Slovenia
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Quote:
Originally Posted by Spiny View Post
My understanding is it will work with reduced output voltage.

However you must not exceed the rated output current. If it is 2 amps at 46 volts then 2 amps at 23 is the max. This is down to the guage of wire used for the windings.
I think that is right
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