The Siemens 3VA1150-5EF32-0HC0 is a SENTRON 3-pole molded case circuit breaker rated for 50 A continuous current across ambient temperatures up to 50 °C, with a 1 A derating step at 55 °C and a floor of 45 A at 70 °C. That thermal profile means it holds full rating in most ventilated enclosures; only tight cabinets or high-ambient zones force a down-rate. Breaking capacity is the headline: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. The 17 kA floor at 690 V still covers most industrial distribution. The line-protection design means it's tuned for cable and busbar protection, not motor overload curves.
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures. Power loss is 14.6 W maximum — relevant for thermal budgeting inside sealed enclosures.