[jaymez10]

Hi all,

I need to identify what amp fuse I need for the fuse situated just below the power supply socket on the case of the laser cutter. Its a 50w Chinese Laser Cutter. I have attached an image to show where the fuse is situated.

[john-100]

without details of your machine

I guess it will have a 150W power supply for the stepper drives
assuming only 50% of the power to the laser control produces the 50W of laser light , your machine requires 250W input

a 20mm 1A fuse if your mains is 240V or 2A fuse if you have a 120V supply will be the minimum fuse size to try


as the stepper drivers and laser are powered by switch mode supplies that take a large surge current at switch on

you may have to use fuses four times the above values to avoid nuisance fuse failures

4A for 240V or 8A for 120V


John

[jaymez10]

Hi John, thank you for your reply. Sorry I forgot to mention that I'm in the UK so my machine is 220v. I checked and the fuse was a 20mm type and on the casing it states is a 250w fuse only.

So to be safe I should go with a 4 amp fuse?

Thanks

James

without details of your machine

I guess it will have a 150W power supply for the stepper drives
assuming only 50% of the power to the laser control produces the 50W of laser light , your machine requires 250W input

a 20mm 1A fuse if your mains is 240V or 2A fuse if you have a 120V supply will be the minimum fuse size to try


as the stepper drivers and laser are powered by switch mode supplies that take a large surge current at switch on

you may have to use fuses four times the above values to avoid nuisance fuse failures

4A for 240V or 8A for 120V


John

[john-100]

I would expect the fuse to have 240V not 240W stamped on it as well as the current

if its a clear glass fuse you will be able to see a straight fuse wire if its a quick blow fuse
and on some anti surge / Time Delay fuses a spring as well as " AT" stamped on the end cap

for mains fuses, 20mm ceramic fuses are available , very like the HRC 1" fuse in the 13A UK plug
the ceramic tube and sand fill is better at containing the explosion and copper plasma in the event of a short circuit
glass fuses can damage the fuse holder in the event of a short circuit

the 4A should be OK

you could have a look inside the control box ,
and have a look if the stepper driver & laser power supplies have labels stating the fuses used
add the two currents up and use the nearest mains fuse

if you can find the manual have a look in there

John