The Siemens 3VM1112-5EE46-0AA2 is a 4-pole IEC frame 160 circuit breaker from the 3VM1 series, rated for line protection with a TM220 thermal-magnetic trip unit. Its breaking capacity class M delivers Icu=55kA at 415 V AC, which means it can safely interrupt fault currents up to that level without upstream cascading — a key figure for panel SCCR coordination. The In=125A continuous rating with adjustable overload protection Ir=88A...125A gives you a 37 A band to dial in the exact motor or feeder load without swapping the breaker body. Short-circuit protection is fixed at Ii=10 x In (1250 A magnetic pickup), and the N conductor is unprotected — standard for a 3-phase + N installation where the neutral is not expected to carry fault current.
Mounts on DIN rail in a standard panel enclosure. The 4-pole footprint (3 poles + unprotected N) matches the common 3-phase + neutral busbar layout for IEC switchgear. Terminal connections accept copper or aluminum conductors up to the frame's rated cross-section — verify lug sizing against the 125 A continuous current for your specific wire type.