What this MCCB brings to the panel
The Siemens 3VA1150-6EF32-0AH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated 50 A continuous at 40 °C, with a thermal-magnetic TM240 release tuned for line protection. Its 220 kA interrupting rating at 240 V gives serious fault-clearing headroom for high-available-fault-current distribution panels — think transformer secondaries or busway taps where standard MCBs would weld shut. The 70 mm depth and 76.2 mm width keep it within a standard MCCB footprint, so it slots into existing SENTRON or third-party panelboards without re-drilling gland plates.
Ratings that decide the fit
Rated current holds at 50 A from 40 °C up to 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C — so in a warm enclosure you lose about 10 % by the time you hit 70 °C ambient. Breaking capacity drops sharply with voltage: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. That 17 kA at 690 V is still respectable for most industrial loads, but if your fault study shows higher available current at 690 V, you need a larger frame. Insulation voltage is rated 800 V, so the breaker itself is comfortable on 690 V systems.
Panel integration notes
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — fits standard SENTRON mounting feet and busbar connectors. The TM240 release is non-interchangeable, so verify your continuous load is at or below 50 A before committing the BOM line. Maximum power loss is 14.6 W, which matters for thermal budgeting in sealed enclosures. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.