SENTRON 3VA1112-4EF32-0AA0 — 125 A MCCB, TM240 Release
The Siemens 3VA1112-4EF32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, built around a TM240 thermal-magnetic overcurrent release and a 125 A continuous current at 40 °C. This 3-pole unit delivers a breaking capacity of 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V — giving you selectivity headroom across common distribution voltages. 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 — useful when the breaker sits in a warm cabinet or near other heat sources. Rated insulation voltage is 800 V, and maximum power loss at rated current is 28.1 W. Front-face protection is IP40, meaning it's protected against tools and wires >1 mm but not sealed against moisture — standard for panel-mount gear.
Panel Fit & Mounting
Footprint is 76.2 mm wide, 130 mm tall, 70 mm deep — a standard 3-pole MCCB form factor that drops into most DIN-rail or screw-mount panel layouts without re-spacing. No undervoltage release, no communication module, no ground-fault monitoring on this variant — it's a straight line-protection breaker. If you need those options, you'd step up to a different 3VA suffix.
Coordination Note
The TM240 release is a fixed thermal-magnetic design — no interchangeable trip units, no electronic adjustments. Set it and forget it. The 121 kA SCCR at 240 V means it can be used as a main breaker in panels fed from high-capacity transformers, provided the let-through energy is coordinated with downstream branch devices.