Electronic overload relay 20...80 A for motor protection size S2, CLASS 5E...30E. Main circuit connection: screw, auxiliary circuit: screw. Manual-automatic RESET, internal earth fault detection. The SIRIUS 3RB3 electronic overload relay provides current-dependent protection for consumers with normal and heavy starting against excessive heating due to overload, phase asymmetry, or phase failure. With large current adjustment ranges and different tripping characteristics, a complete series of motors can be covered with just a few types. Their low power loss makes them particularly energy-efficient and contributes to lower heating in the control cabinet. Worldwide approvals (e.g., IEC and UL/CSA) and applications in explosion-hazardous environments (ATEX) are standard. The 3RB31 version offers enhanced functionalities such as integrated electrical remote reset, earth fault detection, and more. Available with various adjustment ranges for the overload relay and different tripping classes. They come with screw or spring-loaded connections for quick, maintenance-free, and vibration-resistant installation, as well as for standalone use. The accessories are compatible across all sizes S00 to S3. Simple, efficient, always up-to-date - the SIRIUS system modular concept.