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Information on capacitor

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john baines

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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
 

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Les Jones

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Most Helpful Member
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

New Member
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
 

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Les Jones

Well-Known Member
Most Helpful Member
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.
 
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dr pepper

Well-Known Member
Most Helpful Member
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.
 
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