The Siemens SENTRON 3VA1150-5EF32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated for 50 A continuous current (Iu) at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V — figures that cover most industrial distribution fault levels without needing a current-limiting upstream device. The TM240 release has an adjustable long-time delay tr up to 1 s, letting you coordinate with downstream breakers on a selective trip scheme.
Compared to the 3VA1110-5EE32-0JA0 (a 100 A frame with electronic release), this 3VA1150-5EF32-0AH0 is a 50 A frame with a thermal-magnetic TM240 release — simpler, no auxiliary power needed, and more tolerant of harmonic-rich loads that can fool electronic trip units. The 3VA1150 carries the same 70 mm depth and 76.2 mm width as the 3VA1110, so it drops into the same panel cutout and bus-bar layout without rewiring. The trade-off: you lose the adjustable I²t curves and ground-fault options of the electronic version.
Mounts on a DIN rail or panel-mount via the 76.2 mm width — fits a standard 3-pole MCCB footprint. The IP40 front protection means it's suitable for enclosed panel installation where dust ingress is controlled but not for washdown areas. Auxiliary contact version includes 2 auxiliary switches plus 1 trip alarm switch (HQ), which can be wired into a PLC input for remote fault indication. Operating temperature range -25 °C to 70 °C covers most indoor industrial environments; derate above 55 °C (48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, 45 A at 70 °C).