Three-pole construction with an 800 V rated insulation voltage. The interrupting capacity hits 187 kA at 240 V, drops to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3.7 kA at 690 V — so for a 480 V panel you're looking at roughly 75–121 kA of fault-clearing muscle depending on the exact service voltage.
The auxiliary switch design carries two HQ auxiliary switches. If you need ground-fault monitoring or a shunt trip, this isn't the order code — check the 3VA21 family for those options.
It means this MCCB can sit in a warm cabinet next to drives or transformers without losing ampacity. The 187 kA at 240 V is the headline interrupting number; at typical industrial voltages (480Y/277 V) you're working with the 75.6 kA at 500 V figure, which still covers most transformer-fed fault currents below 2000 kVA.