: Yes you can fuse one of the legs. For the test I didn't.

@@AlwynNicholas ...thank you for the response.

i just saw this as i was trying to figure out if these things took AC or DC to power the meter up. For projects where you want to monitor the input to a PSU, you can use the same cable after the IEC socket which i find are sold cheap fused with glass fuse type but typically rated at 10A. You can add your own 1A fuse if you want. The largest danger is the wires, if say there is a short it will be the wires that melt and so your fuse only needs to be smaller than your wires. The worst case is where a wire shorts and pulls all the current, however using the british wiring system our plugs already have a 13A fuse to the surge protector, then another 13A fuse to the UPS, the UPS has a glass 10A fuse, the IEC socket i am using to the PSU another 10A glass fuse. Theres a lot of fuses already. If you are american and you use this definitely fuse it or you can add both a socket breaker and/or a resettable fuse. see about using a GFCI on your socket instead if american. everyone else around the world have gfci on our mains.

@@System0Error0Message ...thank you for sharing your thoughts. This question ( for me) is old and since the time I wrote my question, I simply went ahead and added a small fuse on one power-supply leg of each of the meters....cheers, and Merry Christmas.

You welcome.

Ok.

Ok.

That one can't be used. But there are those that can be used for DC.

Hello sir so the two screws at back of meter x1 and x2 does it mean its positive and negative and do i take the negative wire from the load thru the shunt to monitor the current?

Thanks

Thanks for watching.

And I bought a few of them.

Thank you.

Ok.