The CLASS 10 trip characteristic means it will trip within 10 seconds at 7.2× the thermal setting current, which is the standard for standard-duty induction motor starting (pumps, fans, compressors) where the start time stays under about 6 seconds. No ground-fault detection here — that is handled separately downstream if the installation requires it.
Breaking capacity and SCCR coordination
At 400 V the 3RV2142-4FA10 is rated for 50 kA breaking capacity. For a 480 V system the rating drops to 40 A (the continuous current, not the breaking capacity — the interrupting rating at 480 V is not separately stated in this listing, so verify coordination with the upstream fuse or breaker). The horsepower ratings across common motor voltages are: 3 hp at 110/120 V, 15 hp at 200/208 V and 220/230 V, 7.5 hp at 230 V, 30 hp at 460/480 V, and 40 hp at 575/600 V. These are the full-load motor sizes this breaker can protect at those line voltages.
Mounting position is any, which helps in crowded enclosures. The clearance requirements: 150 mm above and below, 30 mm to the side, 0 mm forward and backward. That 150 mm vertical clearance is for arc-gas venting and heat dissipation; pack it tighter and you derate the interrupting capacity. Wire terminals are screw-type for the main circuit, accepting 2x (2.5 to 16 mm²) solid or stranded, or 1x (10 to 70 mm²) for larger feeds. The depth is 176 mm, width 90 mm, height 165 mm — factor that into the enclosure depth and door clearance if a rotary handle is added.