The Siemens SENTRON 3VA1150-4EF36-0AH0 is a 3-pole molded case circuit breaker (MCCB) with a TM240 thermal-magnetic release, rated 50 A at 40 °C and designed for line protection. Its interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that define the available fault current it can safely clear without upstream coordination issues. The breaker carries a continuous current rating of 50 A from 40 °C through 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 panel ambient temperature directly governs the usable load.
70 mm depth and 130 mm height fit standard 3VA1 enclosure cutouts. Auxiliary switch configuration — 2 auxiliary switches plus 1 trip alarm switch (HQ) — provides status feedback. Rated insulation voltage 800 V.