63 is the shell and frame current rating

C is the C type disconnecting characteristic

32 is the rated current 32A

~400V is the rated voltage is 400V AC

IEC898 6000A is the limiting breaking current 6000A

1 is the incoming line, 2 is the outgoing line of this in, 2 is the outlet of this in

3 is the other in, 4 is the outlet of this in

The electrical symbols indicate that the switch has short-circuit protection and overload protection.

By the way, there is a clerical error in the recommended answer, 2 should be the outgoing line, 3 is the incoming line, don't connect the wrong one.