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Old 20th Jul 2021, 4:11 am   #7
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: What is a reasonable magnetising current for a mains transformer?

Japan has both 50Hz and 60Hz areas. 100V supplies are common.

It is not surprising that a 120v transformer for the US goes into saturation by 240v and the magnetising current shoots up due to a drastic fall in inductance. This effect was used by serious designers to pull mains fuses when someone plugged an instrument in in the UK with its mains settings in the USA condition.

The saturation current of 115v mains fans hit with 240v helped with the fuse pulling, too.

David
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