The PHOENIX CONTACT part 2903687 is a plug-in industrial relay designed with power contacts. It features four-pole double throwing (4 PDT) configuration, offering enhanced versatility for various applications. The relay includes a convenient test key and a status LED allowing for easy monitoring and troubleshooting. Additionally, it incorporates a mechanical switch position indicator, ensuring clear visual indication of the relay's current state. The coil voltage of this relay is 120 V AC, making it suitable for use with standard AC power supplies. Perfect for industrial control systems, this plug-in relay from PHOENIX CONTACT provides reliable and efficient power switching functionality.