What it is and what it does
The Siemens 3VA1163-3EF32-0AB0 is a SENTRON series 3-pole molded case circuit breaker (MCCB) designed for line protection — meaning it sits upstream protecting a feeder or distribution bus, not a specific motor or device. It carries a TM240 thermal-magnetic trip unit, so the thermal element handles overloads and the magnetic element handles short-circuits, with a fixed 63 A rating at ambient temperatures up to 50 °C. Breaking capacity is the headline number here: 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That tells you this breaker is sized for high-fault industrial panels — the kind where a 100 kA SCCR upstream is common and you need the downstream MCCB to hold coordination without cascading. Rated insulation voltage is 800 V, so it's comfortable on 480/277 V or 600 V systems with headroom. The thermal derating curve is gentle — still 63 A at 50 °C, 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C — meaning you don't lose much capacity in a warm enclosure.
Panel integration and physical fit
Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm tall — a standard 3-pole MCCB footprint that fits most Siemens SENTRON mounting bases and panel cutouts. The width is exactly 3 inches, so it aligns with typical DIN-rail or backplate drilling patterns for North American panels. It ships with 2 auxiliary switches HP (high-performance) pre-installed, so you have status feedback for the PLC or SCADA without adding a separate accessory. No undervoltage release, no ground-fault monitoring, no communication module — this is a plain line-protection breaker, not a smart or selectively coordinated unit.