SIRIUS 3RV1021-4BA15 — motor-protective circuit breaker, 20 A, CLASS 10
The Siemens SIRIUS 3RV1021-4BA15 is a motor-protective circuit breaker rated for 20 A continuous current with a CLASS 10 trip characteristic, meaning it protects standard induction motors against overload and short-circuit by tripping within 10 seconds at 7.2× rated current — fast enough for most pump, fan, and conveyor applications without nuisance tripping on startup inrush. Rated breaking capacity reaches 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC — sufficient for high-fault panels downstream of a distribution transformer.
Occupies 45 mm width on the rail — standard for this SIRIUS frame size. Depth is 96 mm, height 97 mm. Front protection class IP20 — safe for finger contact in an enclosed panel. Solid wire accepts 2× (0.5…1.5 mm²) and 2× (0.75…2.5 mm²); stranded accepts 2× (1…2.5 mm²) and 2× (2.5…6 mm²).
Auxiliary switch and control ratings
The design accepts an auxiliary switch module (transverse type) — product extension is supported, so you can add a signal contact for remote status indication without replacing the breaker. Auxiliary contact ratings: 1 A at 24 V, 0.5 A at 230 V, 0.15 A at 60 V — sufficient for PLC digital inputs or indicator lamps.
Shock rated at 25 g / 11 ms. Mountable in any position. Surge voltage resistance rated at 6 000 V. RoHS compliance date 05/01/2012 — substance prohibited per EU directive. No ground fault detection built in; that requires an add-on module.