The 121073-4004-D is a standard D-Subminiature connector featuring 50 socket contacts in size 20 configuration, designed for reliable signal and power transmission in industrial and electronic applications. It is constructed with a steel shell finished in tin, a thermoplastic insulator (PCT UL 94V-0) in black, and copper alloy contacts with gold flash finish (Performance Class 3) for superior corrosion resistance and conductivity. The connector supports a current rating of 7.5 A at 85°C and 5 A at 105°C, with a dielectric withstanding voltage of 1200 VAC at sea level and contact resistance of 10 milli Ohm maximum. Operating across a temperature range of -55°C to +125°C and rated for 50 mating cycles, this connector is ideal for applications requiring robust, high-density interconnections in harsh environments, including aerospace, military, and industrial control systems.