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anvoice:
Hello, a friend asked me for help with replacing a bad component on a device. The photo is attached. To me it looks like an inrush-limiting thermistor, with what appears to be a 150V rating. If this is for a power supply (as hinted at by the isolation slot in the PCB), this is slightly strange because they live in a region with 220V. That could explain why it broke in the first place, assuming I am correct.

Is this indeed a thermistor? I can't read the current rating if it has one, so I was going to ask for a better picture, but should I tell them to replace it with one rated for over 220V?
Thanks in advance.

Benta:
Varistor.

anvoice:
Right, thank you, the proper tern is varistor, or MOV.

I got a little more information: seems like they destroyed the varistor by plugging their device, whatever it is, into 220V when it's rated for less. Apparently they now have a 220V to 110V converter and the device is working at the moment (I'm guessing they bridged the broken varistor though I don't know for sure). I see something that looks like "A8" and "c700" on the component, but a google of these doesn't lead to a compatible varistor. For selecting a replacement, should I choose one with an equal or higher rating? Is there a way to tell what current the replacement should be rated for, or should I just go on the high side (e.g. 50A) to be safe?

Gyro:

--- Quote ---Right, thank you, the proper tern is varistor, or MOV.
--- End quote ---

Actually, both. MOV stands for Metal Oxide Varistor.

anvoice:

--- Quote from: Gyro on September 30, 2018, 10:28:47 am ---Actually, both. MOV stands for Metal Oxide Varistor.

--- End quote ---

That much I knew.

So is it safe to substitute a higher rated one, or should I use the exact voltage and current rating in the replacement?

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