The PHOENIX CONTACT part PLC-RSC-5DC/21 is a PLC-INTERFACE that includes a PLC-BSC.../21 basic terminal block with screw connection and a plug-in miniature relay with power contact. This device is designed for easy mounting on NS 35/7.5 DIN rail and features 1 changeover contact. It operates on a 5 V DC input voltage, making it a reliable and efficient solution for various automation applications.