Thanks itsmoked.
I did speak to the manufacturer and he said that 40A Single Phase RCBO's would work but they didn't. I don't have any details on the earth leakage.
The only solution I can see is changing the RCBO's to D Type MCB's but then I will have to remove the plug/sockets and hard wire...
Hi,
In an installation there are 6no. Eurarc 420 welders supplied from dedicated 40Amp single phase RCBO's housed within a dedicated distribution baord. The welders can be operated as either single or three phase via a selector switch. The current arrangement is single phase with ABB 32A...