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KEMPPI 1500 Mastertig type of varistor RZ 103

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AlexNik

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Hi, all members This forum.
Please, help me identify the type of varistor RZ 103 on the filter power pcb of KEMPPI MASTERTIG 1500.
Varistor.jpg
Varistor RZ103.jpg
 
It's just a surge limiter, you would need information from the unit manufacturer to identify the one they used, but it's usually not at all critical.

However, it only seems to be feeding a zero-crossing detector, so there shouldn't be any surge anyway?. What values are the two resistors feeding the opto-coupler?
 
It's just a surge limiter,
No; look again:

It's in series with the rectifier feed to an optoisolator, not a power system.

It appears to be a VDR that could be used as a voltage dropper for that, ensuring a long turn-off around zero crossings? Or possibly some kind of an "early power fail" brownout detector circuit.

If the welder is for 230V, I think the VDR should have a breakdown voltage (not AC working voltage) of around 80 - 120V.
That will split the power dissipation between that and the 22K, RZ105.
 
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Thank you for advice. I think I understood how it works. This welder is for 230V, but I dont know what voltage I should take to account, Urms =230V or Upk=230*1.41=324V.
Typical value of input forward voltage for couple CNY65 is 1,25V.
 
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