The DXX-EXT-3RO is an option card designed for the DX1 relay system, featuring 2 normally open (NO) and 1 normally closed (NC) relay configuration. This card enhances the functionality of the DX1 relay, allowing for versatile control in various applications. Its robust design ensures reliable operation, meeting industry standards for safety and performance. The option card is easy to install and integrates seamlessly with existing systems, making it ideal for expanding control capabilities in industrial settings. This flexibility makes it a valuable addition to any relay setup.