Circuit breaker size S3 for starter combinations. Rated current 63 A, N-trigger 819 A, screw connection. Standard switching capacity of SIRIUS 3RV2 circuit breakers for starter combinations ensures safe protection of consumers in case of short circuits and safe disconnection from the power supply. The compact and climate-resistant circuit breakers are optimized for use in consumer branches due to their low heat dissipation, and they are naturally suitable for IE3/IE4 motors as well as for switching direct current. Worldwide approvals, such as IEC and UL/CSA, and applications in explosion-hazardous environments are standard. Device variants are available for motor protection, plant protection, short-circuit protection of starter combinations, transformer protection, as main and emergency stop switches, and for use in IT networks. They come with screw or spring terminal connections for quick, maintenance-free, and vibration-resistant connections, and optionally with an integrated auxiliary switch. The comprehensive accessories, such as auxiliary switches, auxiliary relays, signaling switches, etc., are uniform across all sizes. The use of various power supply options significantly reduces the main circuit wiring. The 3RV2 circuit breakers replace the proven 3RV1 series. Simple, efficient, always up to date - the SIRIUS system modular concept.