Dell part number 0UC635 is an intrusion detection switch cable designed for the OptiPlex GX520 desktop system. This internal cable connects the chassis intrusion sensor to the motherboard, enabling the system to detect and log unauthorized case openings. The cable features standard Dell connectors compatible with OptiPlex GX520 motherboards and integrates with system BIOS security monitoring. Typical installations include corporate-managed desktops, secure workstations, and compliance-focused environments where physical access logging is required. This is a genuine Dell OEM component, tested and guaranteed, available via quote.