What the ratings mean for the panel
The 3VA2110-5HL36-0BC0: The 100 A rating holds flat from 40 °C through 50 °C — no derating headache in a warm enclosure. At 55 °C it drops to 96.25 A, at 60 °C to 92.5 A, and at 70 °C to 85 A (–). That thermal curve is what you'd reference for a panel sitting near a furnace line or a roof under summer sun — the breaker doesn't force a full-size bump until you're past 55 °C. The 187 kA at 240 V is the headline interrupting rating; at 690 V it still clears 4.25 kA, which covers most 690 V industrial loads outside the very high-fault zone. Rated insulation voltage Ui is 800 V, so it's comfortable on 480/277 V or 600 V systems with margin. The ETU320 is an electronic trip with adjustable overload and short-time settings — not a thermal-magnetic fixed curve, which matters if you need coordination selectivity downstream.
Built-in auxiliary and undervoltage release
This variant ships with an undervoltage release (UVR) integrated — the basic switch for that is order code 3VA2110-5HL36-0AA0, and the auxiliary trip module is 3VA9608-0BB11. It also carries 2 HQ auxiliary switches for status feedback to a PLC or annunciator. The UVR means the breaker trips when control voltage drops below a threshold — common in emergency-stop chains or undervoltage protection schemes where you want the breaker open if the control supply fails. No communication function and no phase-failure detection on this build; it's a straightforward line-protection MCCB with remote trip capability via the UVR, not a smart breaker with built-in metering. Power loss max is 12.5 W — negligible for panel thermal budgeting but worth noting if you're stacking several in a sealed enclosure.