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. The 70 mm depth and 76.2 mm width fit standard Siemens 3VA panel footprints, so it drops into existing SENTRON busbar systems without re-drilling.
Ratings and what they mean for your panel
The 125 A rating at 40-50 °C is the thermal-magnetic trip baseline — this breaker carries that current continuously without nuisance tripping in a typical 40 °C panel environment. 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. The 187 kA interrupting rating at 240 V is the headline number for high-fault locations — think service entrance or large transformer secondary. 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
This variant ships with a shunt trip release (STL) for remote tripping — useful for emergency-stop circuits or supervisory control systems that need to drop the breaker from a PLC or safety relay. 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. The breaker is designed for line protection (cable and busbar protection), not motor protection — no thermal overload curve matched to motor start-up. For motor branch circuits, pair it with a separate overload relay upstream or downstream.
Physical fit and panel integration
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. Depth of 70 mm leaves room for rear-connected busbars or cable lugs in a standard 200 mm deep enclosure. Mounts on DIN rail or direct panel mount via the 3VA base. The 70 mm depth is the overall body dimension including the rotary handle; no extra projection for the shunt trip module since it is integrated inside the frame.