3RA2120-4BA27-0FB4 SIEMENS

The 3RA2120-4BA27-0FB4 is a fuseless load feeder from Siemens, designed for direct-on-line starting of motors at 400 V AC. It is a Size S0 device, suitable for motor currents ranging from 13 to 20 A. The load feeder operates on a 24 V DC control supply and features screw terminals for easy and secure installation. It is designed for installation on standard mounting rails, simplifying the assembly process in control panels. This device is compliant with both Type of Coordination 1 and Type of Coordination 2, offering flexibility in system design and protection. It has a high short-circuit withstand capacity, with an Iq value of 150 kA, ensuring reliable operation even under fault conditions. The load feeder includes an integrated contactor with 1 NO (normally open) and 1 NC (normally closed) auxiliary contacts for enhanced control and monitoring capabilities. A diode combination is plugged in at the front, providing surge suppression and improving the overall system reliability. This compact and efficient load feeder provides a comprehensive solution for motor starting and protection.