Siemens 3VA1150-3EF32-0AH0 — SENTRON MCCB, 50 A, 3-Pole, TM240 Release
The Siemens 3VA1150-3EF32-0AH0 is a SENTRON molded case circuit breaker (MCCB) rated for 50 A continuous at 40 °C, with a 3-pole configuration and a TM240 thermal-magnetic overcurrent release. Per the datasheet, the interrupting capacity reaches 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V, with a symmetrical rating of 11.9 kA at both 500 V and 690 V. This is a line-protection device, not a motor-protection or ground-fault variant — the TM240 release is fixed, non-interchangeable, and the unit lacks undervoltage release, communication function, and voltage-trip capability.
The 50 A continuous rating holds from 40 °C through 50 °C without derating — at 55 °C it drops to 49 A, at 60 °C to 48 A, at 65 °C to 46 A, and at 70 °C to 45 A. For a panel enclosure running at 55 °C ambient, the breaker still carries 49 A within tolerance. The TM240 release is a thermal-magnetic design with a fixed trip curve; the '240' designates the frame size, not the ampere rating. The interrupting ratings at multiple voltage levels let you verify SCCR coordination: at 415 V the 52.5 kA figure covers most European industrial distribution, while the 11.9 kA at 690 V is the ceiling for that voltage class.
The 3VA1150-3EF32-0AH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole MCCB footprint that fits standard Siemens SENTRON mounting bases and busbar systems. The trip indicator provides a visual flag when the breaker has tripped on overcurrent or short circuit, which aids troubleshooting without opening the panel door.