The Siemens 3VA1150-3EE32-0AA0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous at 40 °C, with a TM220 thermal-magnetic overcurrent release. Breaking capacity is the headline spec here: 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and still 11.9 kA at 690 V. That's a high-interrupting rating for a 50 A frame — it clears severe fault currents without upstream fuses needing to blow, which matters for selectivity in a multi-level distribution board. Front face carries IP40 protection.
Above that it drops: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, 45 A at 70 °C. Maximum power loss is 14.6 W. In a dense panel with multiple breakers side by side, that heat adds up — account for it in the thermal budget, especially if the breaker is enclosed in a gland plate or dead-front. Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint for a 50 A frame.