What it is and what it does
The Siemens 3VM1063-3ED46-0AA2 is a 4-pole IEC frame 100 circuit breaker rated for 63 A continuous current with a TM210 thermal-magnetic trip unit — fixed overload protection at Ir=63 A and fixed short-circuit pickup at Ii=10 x In (630 A). The N conductor is unprotected through the terminal connection, meaning it passes through without overcurrent monitoring, which is standard for line-side neutral configurations in IEC panels. Breaking capacity is 25 kA at 415 V AC (class N), so it safely interrupts faults up to that level without cascading upstream. This suits it for distribution boards where the prospective short-circuit current stays under 25 kA — typical for secondary switchgear in commercial or light industrial installations.