Overload relay 55...250 A for motor protection size S10/S12, CLASS 5...30E contactor assembly/standalone installation. Main circuit: rail connection. Auxiliary circuit: screw connection. Manual-automatic reset, internal earth fault detection. Electronic overload relay SIRIUS 3RB2 for current-dependent protection of consumers with normal and heavy starting against excessively high heating due to overload, phase asymmetry, or phase failure. With large current setting ranges and different tripping characteristics, a whole series of motors can be covered with just a few types. 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-hazardous environments (ATEX) are standard. The version 3RB21 offers extended functionalities such as an integrated electrical remote reset, earth fault detection, and more. Available with various setting ranges for the overload relay and different tripping classes. They come with screw or spring connection for quick, maintenance-free, and vibration-resistant connection, as well as for standalone installation. The accessories are compatible across all sizes S6 to S12. Simple, efficient, always up-to-date - the SIRIUS system modular concept.