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Old 10th November 2012, 05:20 PM   #11
DF96 is offline DF96  England
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Quote:
Originally Posted by Robert Kesh
My last post was intended to be humorous, by the way.
Other people say very similar things and are completely serious. As you are relatively new here we can only guess what was in your mind. If SY said it I would know he was joking, or had enjoyed a particularly good lunch!
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Old 10th November 2012, 07:18 PM   #12
polsol is offline polsol  South Africa
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Hi Andrew,
Thanks for your response. I guess the problem is chosing a mains fuse 'just right' to prevent spurious blowing is a matter of experience.
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Old 11th November 2012, 10:09 AM   #13
AndrewT is online now AndrewT  Scotland
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Pol,
divide VA by Vac and you get the normal maximum current that the transformer will draw.
Choose a fuse around that value and you have selected a close rated fuse.

Alternatively, for motors and transformers and similar inductive loads
the fuse value can be VA / Vac * 3
The T rated three times fuse value will generally allow a toroid transformer, charging up a capacitor input filter, to start and run without nuisance blowing of the mains fuse.
I don't like this alternative. I prefer close rated fusing, except when I get down to lower than 60VA. Then I'll not bother going any lower T250mA (240*0.25 = 60VA)
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Old 11th November 2012, 01:20 PM   #14
polsol is offline polsol  South Africa
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Thanks once more Andrew for all your help.
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