Siemens 3VA1112-3EF36-0BC0 SENTRON MCCB — 125 A, 3-Pole, Line Protection
The Siemens 3VA1112-3EF36-0BC0 is a SENTRON molded case circuit breaker (MCCB) rated for 125 A continuous current at 40 °C, holding that rating steady through 50 °C before a gentle thermal derating curve begins — 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C. That means in a warm panel you still get nearly full ampacity; the derate is predictable and linear. The interrupting ratings are 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V, which covers most industrial service-entrance and feeder applications. IP40 on the front, so it's fine for dry indoor panels but not washdown areas.
For a critical-spares min/max, this is a fast mover in the 125 A range — keep one on the shelf if your plant runs Siemens MCCBs.
Integration Notes
Mounts in a standard DIN-rail or panel-mount footprint for 3-pole MCCBs. The 76.2 mm width (roughly 3 inches) is the standard 3-pole form factor — no surprises for panel fill factor. Undervoltage release (UVR) is built in as the auxiliary release design; the integrated auxiliary trip uses order code 3VA9608-0BB11. Latching endurance is 15,000 operations — typical for this class of MCCB in feeder duty.