Siemens 3RV1421-1HA10 Three-Phase 3-Pole Circuit Breaker

Siemens 3RV1421-1HA10 is a 3-pole S0-size circuit breaker from the SIRIUS 3RV2 family, designed for three‑phase motor and transformer protection on systems up to 690 V. It provides a nominal current range of 5.5 to 8 A and uses a Class 10 release, making it suitable for motor-start protection where fast but precise tripping is required. This unit is rated for operating voltages up to 690 V (AC/DC), with front IP20 protection and a screw-terminal connection, ensuring reliable performance in industrial control panels. The device conforms to a compact 100 mm × 100 mm × 100 mm footprint and weighs about 1.0 kg, aligning with its designation as a size S0 breaker.