The Siemens SENTRON 3VA1112-5EF36-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for 125 A continuous current across the 40-50 °C ambient range, with a full-rated 125 A up to 50 °C before derating begins at 55 °C. Breaking capacity hits 187 kA at 240 V AC, stepping down to 121 kA at 415 V and 75.6 kA at 440 V — numbers that cover most industrial distribution panels and motor control center feeder applications.
Above 50 °C, derating is gradual: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. If your enclosure runs hot, factor those numbers into the load calculation rather than oversizing the frame. At 415 V (common in European industrial grids) it still clears 121 kA, and at 440 V it handles 75.6 kA. Those are SCCR values, not withstand ratings; the breaker must open on fault, not just pass current through.
Built-in release and switching configuration
The auxiliary switch block carries 2 HQ (high-availability) contacts for status feedback to the control system. There is no undervoltage release on this order code, so if you need UVR for undervoltage protection, you will want a different suffix. For motor branch circuits, pair it with a separate overload relay upstream or downstream.
Dimensions: 130 mm height, 76.2 mm width (3 inches), 70 mm depth (2.76 inches). The 3-pole width matches the standard 3VA1112 frame — it occupies one 76.2 mm slot on the SENTRON busbar system. Mounts on DIN rail or direct panel mount via the 3VA base.