MS3112E12-3P is a MIL-DTL-26482 Series I circular connector configured as a box mounting receptacle with pin contacts. It features a shell size 12 with a 12-3 contact arrangement providing 3 size 16 solder cup contacts rated at 13.0 A. The connector is constructed with an aluminium alloy shell with olive drab chromate over cadmium plating, gold-plated copper alloy contacts, and polychloroprene insulator and grommet materials. It operates over a temperature range of -55°C to +125°C, offers IP67 water tightness, and withstands vibration up to 200 m/s² at 10 to 2000 Hz with a minimum of 500 mating cycles. This connector is ideal for demanding military, aerospace, and industrial applications requiring reliable environmental sealing and rugged performance.