What the 63 A rating and 187 kA breaking capacity mean for your panel
That 63 A is the thermal-magnetic continuous current, sized for motor protection duty (the product design is explicitly motor protection). At 415 V and 440 V it still handles 121 kA, and at 500 V it's 75.6 kA; only at 690 V does it drop to 3.7 kA, so keep that in mind if your line voltage is above 500 V. The auxiliary release is a shunt trip (STL) — that's the '5MN36' position in the order code. It lets you trip the breaker remotely via a control voltage, which is standard for emergency-stop circuits or remote shutdown. The trip indicator is not present on this unit, meaning you won't get a mechanical flag showing the breaker tripped on fault vs. manual off; factor that into your troubleshooting workflow.
Mounting dimensions and panel fit
The width is standard for a 63 A frame in the 3VA2 family, so if you're swapping out an older Sentinel or 3VL breaker, check the mounting footprint against the existing busbar or lug kit.
Environmental limits and power loss
The continuous current rating holds at 63 A across the full operating temperature band, so no derating needed even at 70 °C ambient.