Ratings and so-what
The 3RV1021-0FA15-ZX95: Rated 0.5 A continuous, this breaker protects a motor drawing up to 0.12 kW at 400 V AC-3. The CLASS 10 trip curve means it will disconnect within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors during a stall without nuisance tripping on normal start-up. Breaking capacity is 100 kA at 240 V, 400 V, 500 V, and 690 V AC. That covers most industrial fault-current scenarios up to the rated voltage; no need for upstream current-limiting fuses in a panel with sufficient SCCR. Mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022. The 45 mm width and 97 mm height fit a standard motor-starter footprint; depth is 96 mm including the auxiliary switch. Any mounting position is allowed. Operating temperature range is -20 to +60 °C; storage and transport range is -50 to +80 °C. Shock resistance is 25g for 11 ms. Front protection is IP20.