What the ratings mean for fit
The Siemens 3VA1150-6EF32-0AD0 is a SENTRON molded case circuit breaker (MCCB) rated 50 A at 40 °C, with a TM240 thermal-magnetic overcurrent release. That 50 A figure holds steady through 50 °C — the thermal derating only starts at 55 °C (49 A) and drops to 45 A at 70 °C, so it handles a warm enclosure without losing headroom. The interrupting ratings tell the selectivity story: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500/690 V. At 415 V, that 154 kA SCCR means it can sit upstream of a distribution board with high fault current without cascading — the 3-pole design and 800 V rated insulation voltage back the coordination study. The TM240 release is thermal-magnetic, line-protection design, no ground-fault or undervoltage module.
Deployment context
This MCCB mounts on a DIN rail or panel — the 130 mm height, 76.2 mm width, and 70 mm depth fit standard SENTRON 3VA cutouts. Maximum power loss is 14.6 W, so ventilation in a sealed enclosure is worth checking. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C. No communication function and no trip indicator — this is a plain line-protection breaker, not a metering or communicating device.