Electronic overload relay 20...80 A for motor protection, size S2, CLASS 20E, standalone installation. Main circuit: plug-in. Auxiliary circuit: screw terminal. Hand-automatic RESET. The electronic overload relay SIRIUS 3RB3 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 setting ranges and different tripping characteristics, only a few types cover entire series of motors. With their low power loss, they are particularly energy-efficient and contribute to reduced heating in the control cabinet. Worldwide approvals (e.g., IEC and UL/CSA) and applications in explosion-prone environments (ATEX) are standard. Available with various setting 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.