What the ratings mean for fit
The 3VA1150-6EF32-0AC0 is a SENTRON molded case circuit breaker rated for 50 A at 40 °C, with a TM240 thermal-magnetic overcurrent release. The 220 kA breaking capacity at 240 V handles high fault currents typical of utility service entrances. The 3-pole design and line-protection designation (no ground-fault monitoring, no undervoltage release, no communication function) make this a straightforward feeder breaker for a distribution board. The TM240 release is fixed — no interchangeable trip unit — so the 50 A rating is baked in; if the load grows past 50 A, the breaker itself must be swapped.
Thermal derating and panel integration
The breaker carries its full 50 A rating up to 50 °C ambient. Above that it derates linearly: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, 45 A at 70 °C. In a sealed, uncooled enclosure — say a steel panel in a plant mezzanine — the internal ambient can easily hit 55 °C, so plan for the 49 A ceiling rather than the catalog 50 A. The 14.6 W maximum power loss is the heat the breaker dumps into the enclosure; factor that into the thermal budget if the panel is tightly packed. Physical footprint: 70 mm deep, 76.2 mm wide, 130 mm tall. That 3-inch width (76.2 mm) is standard for a 3-pole MCCB in this frame size — it fits the usual DIN-rail or mounting-plate pattern without surprises. The supplied basic switch is 3VA11506EF320AA0, and the auxiliary switch configuration is two HQ-style switches, so if the panel design calls for remote status indication, those contacts are already there.