Replacing old welder SCRs with recent equivalencies.

Thread Starter

BR_T

Joined Apr 7, 2019
5
I've pulled what appear to be 2 duff Semikron SKKH 91/04 from my non-working 1983(?) DC welder and so far have been unable to find the same type available, or any that are 90amp 400v.. Would I be right in thinking it needs to be the same amp/voltage in order to be safe?
 

djsfantasi

Joined Apr 11, 2010
6,527
I've pulled what appear to be 2 duff Semikron SKKH 91/04 from my non-working 1983(?) DC welder and so far have been unable to find the same type available, or any that are 90amp 400v.. Would I be right in thinking it needs to be the same amp/voltage in order to be safe?
Without seeing a schematic or being familiar with welders...

Anything rated 90A or higher and 400V or higher may be a candidate. Like, 100A/600V
 
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