The Siemens 3VA1112-3EF32-0AC0 is a SENTRON molded case circuit breaker (MCCB) for line protection, rated 125 A continuously at 40-50 °C ambient with a 3-pole configuration and a TM240 thermal-magnetic release. Its breaking capacity reaches 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V, with 11.9 kA available at both 500 V and 690 V — figures that govern selectivity coordination in a distribution panel. The TM240 release is a fixed thermal-magnetic trip unit calibrated for line (cable/feeder) protection, not motor or generator duty. The 125 A rating holds across 40-50 °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 — a 9 % drop from 50 °C to 70 °C that a panel builder must account for in a hot enclosure. Rated insulation voltage is 800 V, and maximum power loss is 28.1 W. The breaker carries two factory-fitted HQ auxiliary switches for status indication or interlocking. No undervoltage release, no ground-fault monitoring, no communication function — this is a straight line-protection MCCB for a standard distribution board.
Panel fit & integration
Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm high — a 3-pole MCCB footprint that fits standard Siemens SENTRON mounting plates and busbar systems. The 76.2 mm width (3 inches) matches the typical 3-pole MCCB slot in a distribution panel, so a panel designed for a 3VA1112-5EE32-0AA0 or similar 3-pole SENTRON will accept this breaker without rewiring, provided the TM240 release and 125 A rating suit the circuit.
Breaking capacity & coordination
The 75.6 kA at 240 V is the highest interrupting rating; at 415 V it drops to 52.5 kA, and at 440 V to 32 kA. At 500 V and 690 V it holds at 11.9 kA. These values determine where the breaker can be placed in a fault-current hierarchy — upstream of lower-rated devices, or as a main breaker in a panel with a known available fault current below these thresholds.