3RA2436-8XF32-1NB3 SIEMENS

The 3RA2436-8XF32-1NB3 from Siemens is a complete contactor assembly specifically designed for star-delta (wye-delta) starting of three-phase AC motors. This assembly is rated for AC-3 duty, making it suitable for standard motor applications with a power rating of 45 kW at 400 V. The contactors within the assembly utilize a 20-33 V AC/DC coil, providing flexibility in control voltage options. It features a 3-pole configuration, ensuring reliable switching of all three phases. The size S2 designation indicates the physical dimensions and current carrying capacity of the contactors. Screw terminals are used for secure and easy wiring connections. Electrical and mechanical interlocks are incorporated to prevent simultaneous closing of the main and delta contactors, ensuring safe operation. Furthermore, the assembly includes integrated auxiliary contacts with 3 normally open (NO) and 3 normally closed (NC) contacts for control and monitoring purposes. This pre-assembled unit simplifies installation and reduces wiring effort compared to building a star-delta starter from individual components.