Circuit breaker size S3 for system protection without phase failure protection. A-trigger 80...100 A, N-trigger 1300 A, screw connection. Standard switching capacity of SIRIUS 3RV2 circuit breakers for system protection to safely disconnect in case of short circuits and to protect consumers and systems from overload, as well as for safely isolating the system from the grid. The compact and climate-resistant circuit breakers are optimized for use in consumer branches due to their low heat dissipation, naturally also 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. Device variants are available for motor protection (also with overload relay function), system 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 connection for quick, maintenance-free, and vibration-resistant connections, and optionally with built-in auxiliary switches. The comprehensive accessories, such as auxiliary switches, auxiliary triggers, signaling switches, etc., are uniform across all sizes. The use of various power supply options, such as the associated power 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.