SENTRON 3VA1112-6EF32-0KA0 — line-protection MCCB with shunt trip
The Siemens 3VA1112-6EF32-0KA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) designed for line protection — the core job is clearing faults fast on distribution feeders and branch circuits. It carries a TM240 thermal-magnetic overcurrent release and a built-in shunt trip (STL) for remote opening. Rated 125 A continuous at 40 °C, it holds that same 125 A all the way up to 50 °C, then derates to 114 A at 70 °C. That thermal curve matters when you're packing breakers tight in a panel — the 70 mm depth and 76.2 mm width let it slot into standard SENTRON mounting footprints without crowding. Breaking capacity is the headline here: 220 kA at 240 V, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 220 kA at 240 V gives you SCCR headroom for high-fault utility or transformer-secondaries — you're not coordination-limited by the breaker's interrupt rating. The 800 V rated insulation voltage confirms it's built for 690 V systems with margin.
Shunt trip and auxiliary release design
The auxiliary release is a shunt trip (STL) — it's a voltage-triggered coil that lets a PLC, safety relay, or remote pushbutton open the breaker independently of the overcurrent mechanism. No undervoltage release is fitted. No communication function, no ground-fault monitoring, no trip indicator. This is a clean line-protection MCCB with one remote-trip channel — straightforward to integrate into a safety circuit or emergency-stop chain.
Environmental and power loss
Operating temperature spans -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power dissipation is 28.1 W — factor that into panel thermal calculations when grouping multiple breakers. The 70 mm depth is the dimension that drives enclosure depth selection; the 130 mm height and 76.2 mm width are standard for the 3VA frame.