What this MCCB is and what it does
The Siemens 3VA2163-5JQ32-0KH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in industrial distribution panels. It's a 3-pole unit rated at 63 A continuous current, with no derating needed from 40 °C up through 70 °C — the full 63 A holds across that entire ambient range, which simplifies panel design in warm enclosures. The interrupting capacity hits 187 kA at 240 VAC, 121 kA at 415/440 V, and still delivers 75.6 kA at 500 V — numbers that give real headroom for high-fault installations. At 690 V it drops to 3.7 kA, so watch the voltage class if you're on a 690 V system.
Key ratings and what they mean for fit
The 63 A frame is the backbone — it's the full-scale value and also the continuous rating at every ambient point from 40 °C to 70 °C. That flat derating curve is unusual; many MCCBs start stepping down above 40 °C. The adjustable thermal-magnetic trip range spans 95 A minimum to 756 A maximum, so this breaker can be set to protect loads well below its frame rating if needed. The trip indicator and voltage trigger are both present, and there's an undervoltage release option (not fitted here). The auxiliary switch configuration — 2 auxiliary switches plus 1 trip alarm switch (HQ design) — gives status feedback for PLC or annunciator inputs.
Mounting and integration
Panel cutout dimensions are 105 mm wide by 181 mm tall, with a depth of 86 mm behind the panel. That 105 mm width is the standard 3-pole MCCB footprint for this SENTRON frame size — it fits existing busbar and DIN-rail adapter patterns. The shunt trip (STL) release is built in, so remote tripping from a safety circuit or E-stop is wired directly. Communication function is onboard, meaning it can report status and accept commands over the SENTRON communication bus without an external module.