The Siemens SIRIUS 3RV1021-1JA10 is a motor protection circuit breaker rated for 10 A continuous current with a CLASS 10 trip characteristic — it opens within 10 seconds at 7.2× the thermal setting, which matches the standard protection curve for standard induction motors during start-up.
The 45 mm width (3 TE) and 96 mm depth fit standard distribution boards. Screw terminals on both main and auxiliary circuits accept 2x (1…2.5 mm²) solid or stranded, or 2x (2.5…6 mm²) — no special ferrules needed for the larger range.
Shock rated at 25g / 11 ms, surge voltage withstand at 6 000 V — suitable for industrial environments with moderate vibration and transient events. Operating frequency is limited to 15 operations per hour at AC-3 duty — fine for motor starting cycles but not for frequent switching applications.