One three-pole machine or three single-pole?

Question

Do it yourself

Garage, three phases. We throw one on sockets and light, the second - on heating. The third is idle. We plan to make one three-phase outlet for the compressor.
The question is, do I need to take a three-pole machine or can I put three single-pole ones by connecting their switches? What is the difference, how is the rated current calculated in the first and second cases?

Answer 1

three single-pole with connected switches (that is, all three are cut off at once) completely replace the three-pole one.
in principle, the three-terminal network is often assembled in this way by the manufacturer.
if you take it, it’s better to immediately tripole