What this MCCB does and how it fits
Three-pole, rated 20 A continuously at 40 °C (derates to 19 A at 70 °C), and carries a 220 kA interrupting rating at 240 V, stepping down to 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500/690 V. That SCCR headroom means it can sit downstream of a transformer or a large bus without coordination headaches. Power dissipation maxes at 14.5 W — negligible for panel thermal budget, but worth noting if you're packing a dozen of these in a sealed enclosure.
The UVR is wired into the control circuit; if the coil voltage drops, the breaker trips. That's standard for safety circuits where loss of control power must open the feeder. The two auxiliary switches give you status feedback — one for the panel PLC, one for a remote annunciator.