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Fuses blowing

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January 18, 2012 10:07:51 AM

Hi
In the past 14 days i have had to replace the fuses in my pc power supply 9 times. Not understanding why they keep blowing, any suggestion welcome

I have tried a different lead, changed the plug and tried different sockets.
I was wondering if my PSU has gone. Its a 650watts, but not a fancy make, cost £60 and is 6months old .
Thanks
A

More about : fuses blowing

January 18, 2012 10:16:53 AM

Make and model?
January 18, 2012 11:00:29 AM

At work at moment will post full spec tonight
Related resources
January 18, 2012 11:09:45 AM

the fuse shouldnt blow, there must be a problem with it


amps = voltage * watts

230v * 550 = 2.39 - in other words only 2.4amps of current going through that cable, shouldnt be suffient to blow the fuse

in other words even a 3amp fuse should be enough

its either the psu or your house wiring

id suggest calling in an electrician to have a look if a replacement psu dosnt work (should be able to get a new one, its most likely faulty)
a b ) Power supply
January 18, 2012 11:16:35 AM

I would suggest replacing the PSU before you burn your house down... THAT might be more expensive.
a b ) Power supply
January 18, 2012 11:59:39 AM

If you have a fuse at all get a new PSU. Quality psu's don't use fuses.
a b ) Power supply
January 18, 2012 12:54:20 PM

Minor correction "amps = voltage * watts" should read Amps = Watts / Voltage
650 Watts / 230 Volts = 2.8 Amps. and fuse would probably be a 5 Amp slow blow.

1) First if you are replacing the fuse with a Fast blow, the Inrush current could be causing it to Blow. Inrush current can be 2x to 4x the normal operating current - reason for slow blow fuses vs fast blow fuses.

Little info on fuses - it is not just the current that blows a fuse, there is a time factor also. ie a 5 amp fuse will not blow if say the current is say 6 amps ( may even be 10 amps unless the time is greater than x (ie 30 mSec, don't know time as it's been a real long time since I ran some set on fuses). But exceeding the current rating, while not blowing the fuse weakens it so that say on the 10th time it will blow instantly.

BUT: I would replace the PSU as you have a good chance of Having to replace the WHOLE computer. The first time it blew indicated a problem with the PSU. I dought that the PSU is being overloaded by system. Not enough info on system but I dought your system is over 450 W. And if sytem is operating normally the fault (cause of 1st fuse blowing) was in the PSU itself. A good PSU will simply shut down if it senses an over current on one of its output voltage rails.

a b ) Power supply
January 18, 2012 1:10:31 PM

sir if your psu goes wrong just replace it. you should not be tinkering with the DC power going to your sensitive pc components and possibly frying them.
a c 275 ) Power supply
January 18, 2012 5:28:29 PM

totalknowledge said:
If you have a fuse at all get a new PSU. Quality psu's don't use fuses.

^+1 100% true!
January 18, 2012 5:51:36 PM

davcon said:
^+1 100% true!

thanks all
ps this is my set up

- AMD Phenom II X2 Dual Core 555 3.20GHz Black Edition (Socket AM3) - Retail

- Corsair Hydro H60 CPU Cooler with free Akasa Apache Fan (Socket LGA1366 1155 1156 775 AM2 AM3)

- Corsair Hydro H60 High Performance Liquid CPU Cooler (Socket LGA1366/1155/1156/775/AM2/AM3)

- Akasa 120mm Apache Fan

- Gigabyte GA-MA78LMT-US2H 760G (Socket AM3) DDR3 Motherboard

- Corsair XMS3 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX4GX3M2A16

PSU WIN Power+Plus ape750AE AS/A6
a c 275 ) Power supply
January 18, 2012 6:12:01 PM

Yeah your psu is an old HEC(Compucase) mid 2000's design.
I'll assume it also has a red voltage switch = old feature no longer used in a modern active PFC design.
You could RMA it since it must have some kind of warranty.
Do you have a gpu in your rig?
Personally i think you're better off going with a modern psu from Antec,Corsair,XFX,OZC,etc.
January 18, 2012 6:26:02 PM

davcon said:
Yeah your psu is an old HEC(Compucase) mid 2000's design.
I'll assume it also has a red voltage switch = old feature no longer used in a modern active PFC design.
You could RMA it since it must have some kind of warranty.
Do you have a gpu in your rig?
Personally i think you're better off going with a modern psu from Antec,Corsair,XFX,OZC,etc.



Hi
Graphic - ATI 5670

will order new psu Friday
Thank you
Andy
January 18, 2012 6:40:45 PM

out of interest how high a wattage do i need with my pc set up, please
Ie is 500watts enough
Budget max £45
January 18, 2012 8:55:01 PM

Hi, when you did your PC build did you use the MB stand-off on your PC case?
It keeps the back MB circuits from shorting out on your PC case.
I had a client bring in his PC for help and had the same problems, his MB was shorting out on the case.



xhia said:
thanks all
ps this is my set up

- AMD Phenom II X2 Dual Core 555 3.20GHz Black Edition (Socket AM3) - Retail

- Corsair Hydro H60 CPU Cooler with free Akasa Apache Fan (Socket LGA1366 1155 1156 775 AM2 AM3)

- Corsair Hydro H60 High Performance Liquid CPU Cooler (Socket LGA1366/1155/1156/775/AM2/AM3)

- Akasa 120mm Apache Fan

- Gigabyte GA-MA78LMT-US2H 760G (Socket AM3) DDR3 Motherboard

- Corsair XMS3 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (CMX4GX3M2A16

PSU WIN Power+Plus ape750AE AS/A6

January 19, 2012 5:54:02 AM

GozerHozer said:
Hi, when you did your PC build did you use the MB stand-off on your PC case?
It keeps the back MB circuits from shorting out on your PC case.
I had a client bring in his PC for help and had the same problems, his MB was shorting out on the case.


hi the PSU is attached to the case.
when i did this build i bought a new case, but couldn't get a power supplied to fit for some reason, so returned the case and used my old one

I haven't ordered the PSU yet, debating weather to get a larger wattage than 450, as i have the pc overclocked, currently running at 4.2 on dual core.
a b ) Power supply
January 19, 2012 6:38:19 AM

totalknowledge said:
If you have a fuse at all get a new PSU. Quality psu's don't use fuses.


davcon said:
^+1 100% true!

i guess he means the fuse in the plug. in the uk everything that plugs into the walls 3pin socket should contain a fuse in the plug. i think its the law in the uk. every electrical item that plugs into the wall socket, has to be fused.


!