Circuit breaker size S2 for motor protection, CLASS 20 A trip unit 42...52 A N-trip unit 741 A screw connection. Standard switching capacity with horizontal auxiliary switch 1S+1Ö. SIRIUS 3RV2 circuit breakers for motor protection ensure safe disconnection in case of short circuits and protect consumers and installations from overload, as well as safely isolating the installation 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 are of course suitable for IE3/IE4 motors and equally for switching direct current. Global approvals (e.g., IEC and UL/CSA) and applications in explosion hazardous environments (ATEX or IEC Ex) are standard. 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 come with screw or spring terminal connections for quick, maintenance-free, and vibration-resistant connections, and are optionally available with built-in auxiliary switches. The comprehensive accessories, such as auxiliary switches, auxiliary trip units, signaling switches, etc., are uniform across all sizes. The use of various energy supply options, such as the associated supply system SIRIUS 3RV29, significantly reduces the main circuit wiring. The 3RV2 circuit breakers replace the proven series 3RV1. Simple, efficient, always up to date - the SIRIUS system modular concept.