The Siemens 3VA1150-5EF32-0AF0 is a 3-pole SENTRON molded case circuit breaker rated for line protection duty, carrying a continuous current Iu of 50 A across its full ambient range up to 50 °C, then derating to 45 A at 70 °C. Its TM240 thermal-magnetic release provides fixed overload and short-circuit protection without undervoltage or ground-fault accessories. The interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V — figures that govern selectivity coordination in high-fault panels.
Mechanical endurance of 15,000 cycles suits applications with moderate switching frequency — typical for distribution feeder protection rather than motor-starting duty where higher cycle counts are needed.
The 3VA1150-5EF32-0AF0 occupies 76.2 mm width, 130 mm height, and 70 mm depth — a standard MCCB footprint for DIN-rail or screw-mount panel integration. The 3-pole form factor matches existing busbar and lug kits for the SENTRON 3VA platform. Verify lug torque and wire bending space per the device manual when laying out the gland plate.