Can someone help me please. I have the electrical diagram for connecting the power of an object. The main switch is 63A 4P threephase.I want to add three differencial relay 40A 4P which have the module for 3phase.But i cant understand in logic.How can i connect the cable after main switch that have 4 wires L1 L2 L3 N,with 3 differential relay which have also 4 terminals each one.So they have in total 12 terminals (3 x 4),while we have a three phase cable with 4 terminals(without ground).Please,can someone explain me this misunderstanding?Thanks (Attached by this question is a photo of the electrical diagram)
I'm very dubious that you should be the person responsible for connecting anything that eats 40 or 63 amps of 400V 3-phase power if you are asking this question. That is some VERY serious power and a properly trained electrician is likely a very good investment in being sure that it works safely and correctly.
But, to answer your question, each wire from the main relay needs to become 3 wires to feed the 3 relays - that can be done via 4 insulated buss bars (1 in, 3 out, each) or suitable junctions that securely join the 4 wires and are adequately insulated for 400 volt service.
Evidently the neutral and one phase also need additional wires to the devices on the right of the diagram.