Electronic overload relay 12.5...50 A for motor protection, size S2, CLASS 5E...30E, standalone installation. Main circuit: plug-in connection. Auxiliary circuit: spring-loaded terminal. 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 few types cover entire series of motors. Their low power loss makes them particularly energy-efficient and helps reduce heating in the control cabinet. Worldwide approvals (e.g., IEC and UL/CSA) and applications in explosion-prone environments (ATEX) are standard. The version 3RB31 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 from S00 to S3. Simple, efficient, always up-to-date - the SIRIUS system modular concept.