3RB2123-4QB0 SIEMENS

The 3RB2123-4QB0 is an overload relay designed by Siemens for comprehensive motor protection. It offers adjustable current settings ranging from 6 to 25A, catering to a variety of motor sizes and applications. This relay is classified under size S0 and provides selectable tripping classes from 5 to 30, allowing users to fine-tune the protection characteristics to match specific motor and load requirements. Designed for direct contactor mounting, the 3RB2123-4QB0 simplifies installation and reduces wiring complexity. The main circuit connections utilize screw terminals, ensuring secure and reliable electrical connections. Similarly, the auxiliary circuit also employs screw terminals for easy integration with control systems. This overload relay features manual-automatic-reset functionality, providing flexibility in responding to overload events. It also incorporates internal ground fault detection, enhancing safety and preventing potential damage. Please note that the 3RB2123-4QB0 has been phased out, and the recommended successor is the SIRIUS 3RB3, specifically model 3RB3123-4QB0.