Overload relay 160...630 A for motor protection Size S10/S12, CLASS 5...30E Contactor mounting/stand-alone installation Main circuit: busbar connection Auxiliary circuit: spring-loaded terminal Manual-automatic RESET Internal ground fault detection Electronic overload relay SIRIUS 3RB2 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 3RB21 version offers extended functionality such as an integrated electrical remote reset, ground fault detection and much more.Available with various setting ranges for the overload release and with various 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 S6 to S12.Simple, efficient, always up-to-date - the SIRIUS modular system.