What this MCCB is and what it does
The Siemens 3VA2163-7MS32-0KL0 is a SENTRON molded case circuit breaker (MCCB) built for starter protection — meaning it's designed to sit upstream of a motor starter, handling both overload and short-circuit protection in one device. Rated at 63 A continuously from 40 °C all the way up to 70 °C without derating, so you don't have to recalculate for a warm panel. Three-pole, so it's for three-phase motor loads or distribution feeders. The interrupting ratings tell you where it can go: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 690 V figure drops sharply — if you're on a 690 V system, this breaker is for fault levels under 4 kA, not high-capacity distribution. The adjustable thermal-magnetic trip range goes from 189 A minimum to 945 A maximum — that's the short-circuit and instantaneous pickup window, not the continuous load rating. The continuous rating stays at 63 A. So if you're protecting a motor with a 63 A FLA, the breaker's magnetic trip can be dialed to ride through inrush without nuisance tripping, but the thermal element still protects the conductor at 63 A.
Panel fit and auxiliary wiring
Physical footprint: 105 mm wide, 181 mm tall, 86 mm deep. That depth is the body only — add for handle throw and wiring space. The 105 mm width is three-pole standard for this frame size; check your DIN-rail or mounting-plate layout against that dimension before you drill. Comes with a shunt trip (STL) auxiliary release built in, plus a configurable auxiliary switch block: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch HQ. That gives you remote status — open/closed, tripped, and an electrical signal for the PLC or annunciator — without adding external relays.