It's the go-to for a panel builder who needs a compact, DIN-rail-mounted breaker that coordinates with a contactor and overload relay in a motor starter. Rated Trip Class 10, it clears overloads quickly enough to protect standard motor windings during a locked-rotor event. No ground-fault detection here — that's handled separately if the application requires it.
Dimensions are 45 mm wide by 97 mm deep by 97 mm high. Mount in any orientation. Main contact screws are M3. The compact size leaves room for auxiliary contacts or a shunt trip in the same panel cell.
If you're comparing against the 3RV2021-1GA15, note that the 3RV2021 series is a physically larger frame (55 mm wide) with higher continuous current ratings — it won't drop into a panel cutout or DIN-rail layout designed for the 45 mm 3RV2011 without rework.