Circuit breaker size S3 for starter combinations, rated current 40 A, N-trigger 520 A, screw connection. The standard switching capacity of the SIRIUS 3RV2 circuit breakers for starter combinations ensures safe protection of consumers in case of short circuits as well as 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 and for switching direct current. Global approvals (e.g., IEC and UL/CSA) and applications in explosion-hazardous environments (ATEX or IEC Ex) are standard. Device variants are available for motor protection (also with overload relay function), plant protection, short-circuit protection of starter combinations, transformer protection, as main and emergency stop switches, and for use in IT networks. They are available with screw or spring-loaded 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, such as the associated SIRIUS 3RV29 supply system, significantly reduces the wiring of the main power circuit. The 3RV2 circuit breakers replace the proven 3RV1 series. Simple, efficient, always up-to-date - the SIRIUS system modular concept.