63 A MCCB with 187 kA interrupting capacity — the selectivity workhorse
The Siemens SENTRON 3VA2163-5HN32-0KC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) at 40 °C, with an interrupting capacity of 187 kA at 240 V AC and 121 kA at 415 V AC. That 187 kA figure at 240 V means this breaker can safely clear a bolted fault on a high-capacity transformer secondary without the arc flashing over to the bus — it's sized for main or feeder duty where upstream fault current is high and selectivity with downstream breakers is non-negotiable. It carries the ETU350 electronic trip unit, which gives you adjustable long-time, short-time, and instantaneous protection curves plus ground-fault alarm capability (though the ground-fault monitoring version is listed as 'Without' on this variant — the trip unit itself supports it, but the module isn't populated here). The shunt trip (STL) release and two HQ auxiliary switches are factory-installed, so you don't lose a slot on the panel door for remote tripping or status feedback.
Current production — no LTB clock ticking
Lifecycle status is 'current' — Siemens still builds this exact order code. No last-time-buy notice, no successor announced.
Panel fit and wiring notes
Dimensions are 181 mm high × 105 mm wide × 86 mm deep. Power loss is 4 W maximum. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.
Built-in auxiliaries save panel space
The 2 HQ auxiliary switches (form C, rated for high electrical endurance) are integrated into the breaker body — no external add-on module needed. The shunt trip release is also internal, wired to the 3VA9688-0BL33 integrated auxiliary trip. That keeps the wiring tidy and avoids the extra DIN-rail footprint a separate shunt-trip module would take.