What this MCCB is and what it carries
The Siemens 3VA2163-5JQ32-0KL0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 63 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel layout when the breaker sits near other heat sources. Breaking capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA at 240 V tells you this breaker is sized for high-fault installations — think transformer secondaries or large motor control centers where the available fault current is well above what a standard 65 kA or 100 kA MCCB can handle. The 3.7 kA at 690 V is a reminder that at higher voltages the arc extinction limits the interrupting rating; if your system runs 690 V, verify the fault current stays under that threshold. The magnetic trip range spans 95 A to 756 A, adjustable via the internal trip unit. That wide band lets you set the instantaneous pickup to coordinate with downstream breakers or motor starters — set it low enough to protect the feeder, high enough to ride through inrush without nuisance trips.
Physical fit and integration
Dimensions: 181 mm height, 105 mm width, 86 mm depth. The 105 mm width is the standard 3-pole MCCB footprint for this frame size — it occupies three 35 mm DIN-rail modules (roughly 105 mm total). The 86 mm depth means it clears most standard enclosure back-panels without needing a spacer; verify the gland plate clearance if the breaker is mounted near the enclosure door. The breaker includes a shunt trip (STL) release and a full complement of auxiliary switches: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ configuration). That gives you remote status and trip indication without adding external relay logic. The shunt trip allows remote opening via a control voltage — useful for emergency-stop circuits or supervisory shutdown sequences.
Environmental and operational limits
Operating temperature range: -25 °C to 70 °C. Storage range: -40 °C to 80 °C. Maximum power loss is 4 W — negligible for thermal budgeting in a panel, but worth noting if the breaker is in a sealed enclosure with multiple heat sources. The 63 A rating holds flat across the full operating range, so no derating curve to apply.