4 Connection and installation Page 23
Stud welding unit operating manual Date: July 2021
ALPHA 850 07.2021 / EN Rev.: A
• Transformer version: Europe standard
System voltage 400 V
Power supply fuse T 35 A
System voltage 500 V
Power supply fuse T 35 A
• Transformer version: France/Norway
System voltage 230 V 400 V
Power supply fuse T 63 A T 35 A
When connecting to a 230 V delta circuit [ ] / 400 V star circuit [ ] the phases must
be assigned as follows and the following connection terminals must be linked:
Primary voltage L1 L2 L3 Link
230 V 1 2 3
1 4 2 5 3 6
400 V 2 4 6
1 3 3 5
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