What this MCCB is and what the ratings mean for fit
The Siemens 3VA1150-6EF32-0AB0 is a SENTRON 3VA molded case circuit breaker (MCCB) designed for line protection. Three poles, rated 50 A continuously at 40 °C with a TM240 thermal-magnetic trip unit — that fixed 50 A frame means it's sized for feeder or branch circuits where the load current sits at or below that mark, not for adjustable-range applications. The TM240 release is fixed thermal and magnetic, so don't plan on dialing the trip curve; what you order is what you get for overcurrent protection. Breaking capacity is where this part earns its panel space: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and still 17 kA at 690 V. That 220 kA figure at 240 V is the headline — it handles high available fault current at low voltage without cascading upstream. The 690 V rating (17 kA) is the one to check if you're feeding a 600 V class motor control center. Insulation voltage rated 800 V, so the internal clearances support that voltage class. No ground-fault monitoring built in, no undervoltage release, no communication module. The auxiliary switch complement is two HP-style switches. If your BOM calls for a shunt trip or UVR, this variant doesn't carry it — you'd need a different order code from the 3VA family.
Integration and mounting
Dimensions: 130 mm height, 76.2 mm width (3 inches), 70 mm depth. That 3-inch wide footprint is standard for a 3-pole 3VA frame — it mounts on a DIN rail or panel-mount adapter. The 70 mm depth means it fits shallow enclosures where a deeper MCCB would crowd wiring gutters. Power loss at rated current is 14.6 W maximum — factor that into enclosure thermal rise if you're grouping several breakers.