Siemens 3VA1150-4EF36-0AC0 — 50 A MCCB with TM240 Release
It carries a 121 kA interrupting capacity at 240 V AC, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V — numbers that matter when coordinating with downstream devices in a high-fault panel.
The 121 kA at 240 V is the headline number, but the 75.6 kA at 415 V is the one that governs most industrial motor-control panels on 400 V three-phase. That's enough for full selectivity with most upstream SENTRON or 3WL air breakers in a typical distribution board — no need to oversize the main just to cover a 50 A feeder.
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or screw-mount panel layouts. The front face is IP40 rated, so it's fine for a clean indoor enclosure; no special gasket needed. Two HQ auxiliary switches (form C) are built in, giving you normally-open and normally-closed status contacts for PLC feedback or alarm annunciation without adding a separate accessory block.