MS3057-12A-1 is a military-specification connector manufactured by Crown Connector, Inc. It is a 41-pin, size 12, high-density connector that meets MIL-DTL-5015 and MIL-C-5015 specifications. It has a high current-carrying capacity, and is ideal for use in high-density applications. The MS3057-12A-1 includes a polyamide insert body and insulation support, along with silver-plated brass pins with a glass-filled polyester insulator. It is designed for use in aerospace and defense applications.