The 3RV2021-1HA15: Trip class CLASS 10 means it disconnects within 10 seconds at 7.2× the thermal setting current, fast enough to protect standard IEC motor windings during a locked-rotor event. Breaking capacity is 100 kA at 400 V and 240 V, 42 kA at 500 V, and 4 kA at 690 V. At 480 V it is rated 8 A; at 600 V also 8 A. These figures cover most industrial distribution levels up to the 690 V class, meaning the breaker can interrupt bolted faults on a 400 V bus without upstream fusing — useful for a line-side disconnect in a motor control center. Width is 45 mm — occupies one standard 45 mm modular slot. Any mounting position is permitted. Screw-type terminals for the main circuit accept 2x (0.5…1.5 mm²) or 2x (0.75…2.5 mm²) solid or stranded wire. The part is qualified for the full industrial temperature envelope.
Depth is 97 mm, height 97 mm, width 45 mm. Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the side, 0 mm forwards and backwards. This means the breaker can be mounted flush against a backpanel or enclosure wall on the forward/backward axis, but needs 50 mm above and below for air circulation and arc-quenching clearance. Maximum switching frequency at AC-3 and AC-3e duty is 15 operations per hour. That is typical for a motor-starting application — adequate for a conveyor, pump, or fan cycling a few times per hour, but not for a rapid-cycling press or servo spindle.