What this MCCB is and what it does
The Siemens SENTRON 3VA2163-7MS32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated 63 A continuously across the full 40 °C to 70 °C ambient range — no derating needed in a warm panel. It's designed for starter protection, meaning it's sized to sit upstream of a motor contactor and handle the high inrush without nuisance tripping, while still clearing faults fast enough to protect the starter components. The adjustable thermal-magnetic trip unit has a minimum trip setting of 189 A and a maximum of 945 A.
Integration and mounting
The 3VA2163-7MS32-0AH0 measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard MCCB footprint that fits Siemens SENTRON distribution panels and most common enclosure cutouts. It ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type) built in, so you get remote status indication without adding external modules. There is no undervoltage release, no ground-fault monitoring, and no communication function — this is a straightforward thermal-magnetic breaker for motor protection, not a power-monitoring device. The basic switch assembly is order code 3VA2163-7MS32-0AA0, which is the core switching mechanism. The -0AH0 suffix indicates the factory-fitted accessories (the auxiliary and alarm switches). If you're replacing just the switch body, order the -0AA0; if you need the full assembled unit with auxiliaries, this -0AH0 is the drop-in.