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Post by Deleted on Nov 25, 2013 19:49:19 GMT
It seems to be one of those "I always wanted to know but was too afraid to ask" type questions.
I had look around the web and encountered many different answers to this resulting in differing calculations with different results!
The one that was simplest was provided by digikey;
Primary voltage divided by secondary va multiplied by 1.35 on a slow blow fuse.
So, taking an example of a 2 x 120v primary, with a 2 x 35va (25-0-25) secondary, the calculation would be;
70va/240v*1.35 = 0.39a, therefore a 400ma fuse.
Is that correct?
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Post by Deleted on Nov 25, 2013 21:12:30 GMT
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Post by PinkFloyd on Nov 25, 2013 22:42:39 GMT
30VA for 230V duty = 250mA slow blow 30VA for 115V duty = 500mA slow blow Sounds about right to me?
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Post by Deleted on Nov 27, 2013 18:50:30 GMT
Thanks for the replies guys. It does seem to a bit of a minefield trying to find a definitive answer. Everywhere I look I get different answers.
As I have a particular transformer in mind I have emailed the manufacturer for a recommendation. (Square block, laminated style, 2 x 120 in & 25-0-25v @ 35va each out.
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Post by Deleted on Nov 28, 2013 16:17:22 GMT
Time to give credit where it's due. I emailed Trans-Tronic well after business hours last night and received the required information by return very early this morning! So a big gold star and sincere thanks to them.
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