The interrupting rating is the headline: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, dropping to 75.6 kA at 500 V and 3 kA at 690 V. The 63 A frame with that interrupting capacity means you're buying fault-current headroom, not just load current.
Auxiliary and trip options built in
That means you get remote status indication (open/closed/tripped) and remote trip capability without adding external modules. The shunt trip lets a safety PLC or E-stop circuit kill the breaker directly — useful for emergency-off chains or remote shutdown. No undervoltage release on this variant, so if you need UVR for undervoltage protection, this isn't the one. Power loss is 5.4 W maximum, negligible for panel heat budgeting.
The 86 mm depth includes the handle and terminals; check your enclosure depth if you're retrofitting into a shallow panel.