What this MCCB carries and where it fits
The Siemens 3VA1150-3EF32-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for 50 A continuous current across a 40 °C to 50 °C ambient — it holds 50 A flat through that range, then derates to 45 A at 70 °C. Three poles, line-protection design, no communication module onboard. The interrupting ratings climb with voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at 500 V and 690 V. That spread tells you this breaker is sized for high-fault industrial panels where the available short-circuit current varies by supply voltage — common in 480Y/277 V or 400 V distribution. It ships with an undervoltage release (UVR) fitted and a 2-auxiliary-switch plus 1-trip-alarm-switch HQ configuration — so it drops into a circuit that needs loss-of-voltage tripping and status feedback without adding external relay logic. The rated insulation voltage is 800 V, and maximum power loss runs 17.1 W at full load — relevant for enclosure thermal budgeting.
Panel fit and integration notes
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. Mounts on a DIN rail or panel-mount baseplate in the standard SENTRON 3VA footprint. The 3-pole body and integrated UVR mean the breaker occupies the same slot as a base MCCB plus an external undervoltage module — saves one DIN position. Auxiliary switches and trip alarm are pre-wired to the terminal block; no additional wiring for status indication.