The Phoenix Contact Terminal Blocks - Interface Modules 2321871 is a reliable and efficient interface relay module. It features two 50-pin Yokogawa KS spring cage connectors, and is rated for 100mA 30V dc. This module is designed to provide a secure connection between two devices, and is ideal for applications that require a reliable and robust connection. The spring cage connectors ensure a secure connection, and the module is designed to be easy to install and maintain. The module is also UL approved, ensuring that it meets the highest safety standards. With its reliable performance and easy installation, the Phoenix Contact Terminal Blocks - Interface Modules 2321871 is an ideal choice for any application that requires a secure and reliable connection.