What this breaker does for your motor branch
The Siemens 3RV1021-4AA15-ZX95 is a SIRIUS motor-protective circuit breaker rated for 16 A continuous current with a CLASS 10 trip characteristic, meaning it clears overloads fast enough to protect standard induction motors during start-up without nuisance tripping on normal inrush. Rated motor power at 400 V is 7.5 kW, which lines up with a typical 10 HP four-pole induction motor on a conveyor or pump. The trip class CLASS 10 holds takt time on a weld line: it lets the motor accelerate under load without dropping out, but still trips inside 10 seconds at 7.2× rated current — deterministic, every cycle.
The 45 mm width and 97 mm height fit a standard panel grid; depth is 96 mm. Terminals are screw-type on the main current circuit. Solid conductors: 2×(0.5…1.5 mm²) and 2×(0.75…2.5 mm²). Stranded: 2×(1…2.5 mm²) and 2×(2.5…6 mm²). The auxiliary switch is transverse design with zero auxiliary contacts fitted as standard — add a separate auxiliary block if you need a remote status signal. Operating temperature range is -20 to +60 °C; storage and transport from -50 to +80 °C. Shock rated at 25 g / 11 ms, which covers most industrial vibration environments.