The PHOENIX CONTACT part REL-IR4/L-120AC/4X21 is a versatile plug-in industrial relay designed for reliable power switching. It features four power contacts with four-pole double throw (4 PDT) configuration, ensuring high flexibility in various applications. Equipped with a test key, this relay offers easy and convenient testing procedures. The built-in status LED provides visual indication of the relay's operational status, enhancing troubleshooting efficiency. Additionally, a mechanical switch position indicator ensures clear visibility of the relay's current position.The REL-IR4/L-120AC/4X21 operates on a coil voltage of 120 V AC, making it suitable for a wide range of industrial environments. Whether you need reliable power switching in automation systems, machinery, or other industrial applications, this plug-in relay delivers exceptional performance and durability.