Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss

Correct fuse size?

0 views
Skip to first unread message

ti2...@iname.com

unread,
May 3, 1998, 3:00:00 AM5/3/98
to

How do you calculate the correct fuse size for use in a power supply? I have a
Miyako 10 amp power supply who's fuse was rewired, so instead of being between
the transformer and the power switch it's now between the PCB and the power
terminal.

A few days ago I was trying out some equipment on the supply and the fuse
blew, I calculate the current consumption to be at no more than 4 amps... but
the fuse installed in the supply was a 2 amp fuse, sounds like too little to
me.

So I would like to replace it with a higher capacity fuse to see if I can get
the supply to work as it should, but I have no idea how to calculate the
correct fuse rating. Is it simply the maximum amount of amps the supply can
put out (10 amps) or is there some other factor I should consider?

---------
//\/\ario //\/\elendez
ti2...@iname.com

-----== Posted via Deja News, The Leader in Internet Discussion ==-----
http://www.dejanews.com/ Now offering spam-free web-based newsreading

Samuel Goldwasser

unread,
May 4, 1998, 3:00:00 AM5/4/98
to

Where exactly is the fuse and WHY was it moved (at the very least, you should
add one in the primary circuit where it was originailly - to protect against
a shorted power transformer I would presume.

If it is in the DC output circuit, using a value just above the maximum rating
should be fine.

If it is somewhere else, you need to determine how the current there relates
to the output current including losses.

--- sam : Sci.Electronics.Repair FAQ: http://www.repairfaq.org/REPAIR/
Laser FAQ: http://www.misty.com/~don/lasersam.html

0 new messages