3RA2434-8XF32-1AL2 SIEMENS

The 3RA2434-8XF32-1AL2 from Siemens is a pre-wired contactor assembly specifically designed for star-delta (wye-delta) starting of three-phase AC motors. This assembly is suitable for motors with a power rating of 22 kW at 400 V in AC-3 duty (standard for induction motors). The control voltage for the contactors is 230 V AC, operating at 50/60 Hz. It comprises three contactors: one main contactor, one star contactor, and one delta contactor, along with a timing relay (if required) to automate the start sequence. The contactors are size S2, indicating a specific current and voltage handling capacity within the Siemens range. Screw terminals are provided for secure and reliable electrical connections. An electrical and mechanical interlock system is integrated to prevent simultaneous closing of the star and delta contactors, ensuring safe operation and preventing short circuits. Auxiliary contacts (3 normally open and 3 normally closed) are built-in for control and feedback circuits, enhancing the flexibility of the assembly. This pre-assembled and tested unit simplifies installation and reduces wiring errors compared to building a star-delta starter from individual components.