Fuse For Pc Dell Optiplex 5040

[NC68]

I have come across an old PC that I would like to turn on. However, before plugging in an IEC lead into it I want to make sure I have the correct fuse. (Using a 13amp IEC lead - UK)

 

Below are my findings. I am a bit confused as to what is being shown and what to do from a safety point of view.

 

When I look on the Dell website specification for the Dell OptiPlex 5040 it states that the power wattage is 240W.

Using Ohm's Law for Amps, I get the Amps to be 1 amp.

 

So I would have thought using a 3 amp fuse in the plug would be sufficient (and safe)....

 

However,

 

I then see on the side of the PC there is a sticker that has various symbols and text and I see on there it is showing:

 

V: 100-240V

A: 3.0A

Hz 50/60Hz

 

My question is, what goes in the IEC lead.... do I now use a 5amp fuse?

I understand it's best practice not to use a fuse that is similar to the amp rating (so in this case a 3amp fuse as shown on the sticker) but the next fuse above (5amp)

 

When it comes to stickers and PC's that will have this sticker on, which rating do you go for?

The Dell website showing the power information, or the sticker showing that information on the PC?

 

I am in two minds as to use a 3 amp fuse or a 5 amp fuse for the IEC lead?

 

Any advice would be greatly appreciated (and peace of mind).

[bhg481]

A 3 amp fuse will be adequate but a 5 amp fuse will also be safe. The computer can run on a 100V supply (if you could find one) in which case it will draw 2.4 amps (still less than 3). 3 amp is OK.

[NC68]

Thanks for the reply. So what does this mean on the sticker:

 

V: 100-240V

A: 3.0A

Hz 50/60Hz

 

I see the A: 3.0A and assume this is for the power unit inside the PC? So a 5amp would be OK to use?

 

[bhg481]

Most of the components in the computer are low-voltage; the power supply will accept any AC voltage from 100V to 240V and reduce it to the DC voltage required. The power requirement will be the same but your Ohms Law calculation tells you that a 100V supply will take more current than a 240V supply for that power. The power required will vary slightly depending on what accessories (disc drives etc) are plugged in and how hard the CPU is working at any given time.