What this MCCB delivers on the line side
The Siemens SENTRON 3VA1112-3GF46-0AA0 is a 125 A, 4-pole molded case circuit breaker (MCCB) built for line protection — the primary feeder breaker in a distribution panel, not a downstream branch device. Its TM240 thermal-magnetic trip unit handles overloads and short-circuits without external power, so it stays self-contained on the bus. Rated interrupting capacity drops with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 75.6 kA at 240 V is the headline number — it clears high-fault scenarios on 240 V delta or wye services common in North American industrial panels. Current rating holds flat at 125 A from 40 °C to 50 °C, then derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. In a warm enclosure near the top of a panel, that 114 A floor at 70 °C still leaves headroom for a 100 A continuous load.
Panel fit and footprint
The 3VA1112-3GF46-0AA0 measures 130 mm high, 101.6 mm wide, and 70 mm deep — a 4-pole MCCB that fits standard SENTRON mounting footprints. IP40 on the front means it's protected against tools and wires larger than 1 mm, but not against water ingress; keep it inside a rated enclosure. No undervoltage release, no communication module, no ground-fault monitoring — this is a straight thermal-magnetic breaker for basic feeder protection. If your BOM calls for those functions, you need a different 3VA variant with the aux/COM slot populated.