SENTRON 3VA1112-6EE36-0AA0 — 125 A MCCB with TM220 Trip Unit
The Siemens 3VA1112-6EE36-0AA0 is a SENTRON-series 3-pole molded case circuit breaker (MCCB) rated for 125 A continuous at 40 °C, with a TM220 thermal-magnetic overcurrent release — meaning the thermal element handles overloads and the magnetic element clears short circuits up to its rated breaking capacity. It carries 154 kA at 415 V, which is the figure that governs fault clearance in a 400 V-class distribution panel; the 220 kA at 240 V and 75.6 kA at 440 V give you the selectivity headroom for high-fault installations like transformer secondaries or large motor control centers.
The 125 A rating holds steady from 40 °C through 50 °C (still 125 A at 50 °C), then derates gradually to 114 A at 70 °C — so in a warm enclosure you still get most of the nameplate current without having to oversize the breaker. The TM220 trip unit is the fixed thermal-magnetic type; no electronic adjustment or communication function, which keeps it simple and reliable for line-protection duty in standard distribution panels. Max power loss is 28.1 W, which matters for enclosure heat budgeting — in a packed panel with several breakers, that figure adds up fast and can drive ventilation decisions.
Integration Notes
Three-pole design, 76.2 mm wide (roughly 3 inches) — fits standard DIN-rail or panel-mount footprints common in SENTRON and 3VA-series enclosures. Depth is 70 mm, height 130 mm. Front IP40 protection class keeps dust and tools out but isn't rated for washdown; mount it inside a sealed cabinet if the environment is wet or dusty. If you need shunt trip or remote status, you're looking at a different variant in the 3VA family.