The Siemens 3VM1112-4EE46-0AA2 is a 4-pole circuit breaker from the 3VM1 IEC frame 160 series, rated for line protection with a TM220 thermal-magnetic trip unit. Its headline breaking capacity is 36 kA at 415 V (class S), meaning it can safely interrupt fault currents up to 36,000 A without cascading failure upstream — a critical number for selectivity studies in distribution panels. The continuous current rating In=125 A, with adjustable overload protection Ir from 88 A to 125 A, and fixed short-circuit protection Ii=10 x In (1250 A). The neutral conductor is unprotected, so this breaker is intended for 3-phase + N systems where the neutral is not switched or protected.
Deployment Context
This breaker mounts on a DIN rail in a panel or enclosure. The 4-pole design with unprotected neutral suits it for 3-phase + N distribution where the neutral bus is bonded elsewhere (e.g., main switchboard). The 36 kA SCCR at 415 V gives headroom for high-fault installations, but verify coordination with downstream devices — the fixed Ii=10 x In means magnetic trip at 1250 A, which may not coordinate with some branch breakers on low-impedance faults.