Overload relay 12.5...50 A electronic for motor protection Size S2, CLASS 5E...30E Contactor attachment Main circuit: screw Auxiliary circuit: screw Manual-automatic RESET Internal ground fault detection Electronic overload relay SIRIUS 3RB3 for current-dependent protection of consumers with normal and heavy starting against impermissibly high heating as a result of overload, phase asymmetry or phase failure. Thanks to large current setting ranges and different tripping characteristics, entire series of motors are covered with just a few types. With their low power loss, they are particularly energy-efficient and contribute to less heating in the control cabinet. Worldwide approvals (e.g. BIEC and UL/CSA) and applications in potentially explosive applications (ATEX) are a matter of course. The 3RB31 version offers extended functionalities such as an integrated electrical remote reset, ground fault detection and much more. Available with different setting ranges for the overload release and with different tripping classes. They are available with screw or spring-loaded connections for a quick, maintenance-free and vibration-proof connection, as well as for individual installation. The accessories are suitable for all sizes S00 to S3. Simple, efficient, always up-to-date - the SIRIUS modular system.