PA-1103-BT is a 3U relay rack panel designed for standard 19-inch rack installations. It features Type B configuration with a height of 5.22 inches (132.5 mm) and a depth of 2.25 inches (57.2 mm), providing adequate space for relay mounting and component integration. The panel is constructed from 0.13-inch (3.2 mm) thick aluminum and is available in multiple finish options including metallic gray, white texture, and black texture. This panel is commonly used in telecommunications, industrial control systems, and data center applications where reliable relay mounting and signal distribution are required.