Using 230v Transformer with 120v Mains

Phostenix · 24th September 2009, 06:04 PM

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!

paulb · 24th September 2009, 06:16 PM

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.

Spiny · 24th September 2009, 06:21 PM

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.

luka · 24th September 2009, 08:46 PM

Quote:

Originally Posted by Spiny

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

24th September 2009, 06:04 PM	#1
Phostenix diyAudio Member Join Date: Sep 2009 Location: Phoenix, AZ	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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24th September 2009, 06:16 PM	#2
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	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.

24th September 2009, 06:21 PM	#3
Spiny diyAudio Member Join Date: Feb 2008	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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