Switching adapters

Rdm1 · Jun 18, 2018

Hi all, whilst doing some appliance testing I have come across about 8 switching adapters that power computer monitors but I am confused as to why they all contain 10a fuses as I thought with the low power rating the fuse would be rated much lower, or am I missing something? Pictures attached for reference. Thanks in advance

[ElectriciansForums.net] Switching adapters

SparkyChick · Jun 18, 2018

It's most likely going to be to handle the inrush current.

Switch mode power supplies have some sizeable inductors and capacitors that can cause big spikes when they are first powered on.

static zap · Jun 18, 2018

Or someone with a stock of 10A fuses , missed the decimal point ! ( s-h-g-2-s-savers)
3 A sounds more appropriate

littlespark · Jun 18, 2018

The top photo there says the input is 1.0A max, not 10.
Pop the fuse out, what is it?

telectrix · Jun 18, 2018

agree with sparkychick. altough it's rare to see these PSUs with a fuse in the plug at all.

westward10 · Jun 18, 2018

Do they still function with the fuse removed.

westward10 · Jun 18, 2018

Seems funny but one of our PAT lads a few years ago had something similar but not quite the same as those. He popped out the 13A fuse but had to go to his van for some more 3A fuses, in the meantime someone plugged it back in and it still functioned.

pirate · Jun 18, 2018

Still lots of adapters and extension sockets out there sold from the usual internet sites that are non-compliant, the fuses are not connected into the line and the cables are drastically undersized.
The fuses are naff, too...

Rdm1 · Jun 19, 2018

SparkyChick said:
It's most likely going to be to handle the inrush current.

Switch mode power supplies have some sizeable inductors and capacitors that can cause big spikes when they are first powered on.