Information on capacitor

[john baines]

Hi hope you can help me,I have a rectifier for a mig welder with a circular cap 23mm dia 3mm width markings on it 24M 220VB colour blue, I am not sure if its across the a/c or dc, and what its function is, could you please give me any info from the markings on it so I can replace it if required , I would be most gratefull for your reply, please find attached photos
J.Baines

 

[Les Jones]

I think it is more likely to be an MOV (Metal oxide varistor.) These absorb transient spikes. I suspect that the 24m could mean it is 24mm dia and the 220v is the voltage rating. If it is on a rectifier it should be easy to work out if is AC (On the input) or DC on the output.) Post some pictures of the rectifier.

Les.

 

[john baines]

Hi thank you for the reply ,I have attached photo of rectifier and info from diodes, I think the blue and red leads are the +- of the dc, with the device MOV across these terminals hoping you can shed more info or if I am right in my assumsion
J.Baines

 

[Les Jones]

I think you are correct. I think you will find that the output of the main transformer connect to the heatsinks. In my last post I had not noticed that you gave the diameter of the MOV as 23mm I think that is near enough to confirm the 24M is the diameter. I think you should find a suitable one from most of the MOV suppliers.

Les.

 

[Tony Stewart]

Buy several . They do wear out. They may be ganged.
E.g https://industrial.panasonic.com/ww...omponents/varistor-type-d-series-v/ERZV20D241

Used on AC side

 

[dr pepper]

I think it looks like a Mov too, and its across the Dc output of the weld set.
In my experience these things fail with a bang, although yours does appear to have a crack.
The set would probably still output something even with the part dead, what problems are you experiencing.