MS3057-12AC is a military-specified standard circular Multi-Pin Connector from the MIL-DTL-5015 Series. These Multi-Pin Connectors have square coupling and was developed specifically for use in U.S. military shipboard systems and applications. Originally designed to be equivalent to the AN-Type connectors of other militaries, the MIL-DTL-5015 Series has since become widely used for its reliability and versatility. These Multi-Pin Connectors feature shells made from aluminum alloy, with threaded coupling, and offer several different optional environmental seals configurations. The MS3057-12AC is an inline Multi-Pin Connector with 12 contacts. It is made up of three main parts: the connector shell, coupling nut, and a protective backshell/cable clamp. The connector shells are available in straight or 90° exit angles with finger-tightening or captive coupling nuts. It has a shell size of 12-13 which is ideal for applications needing a medium size Multi-Pin Connector. MS3057-12AC offers easy installation and unmatched protection from dust, dirt, and moisture. The protective backshell is designed in a way that helps prevent tampering through excess unthreading of the coupling nut. This feature alone ensures a good temperature and vibration resistance and also provides superior shock and pull strength. Furthermore, the cable clamp of the MS3057-12AC provides increased strain relief which helps protect the connected cables from unexpected harsh conditions. Other important features of the MS3057-12AC are its excellent electrical performance and its reliable mating ability. It comes with a EMI/RFI Shielding that keeps the system performance free from internal and external disturbances, and it also has a secondary grounding conductor that increases the reliability of the contacts. Additionally, the MS3057-12AC comes with a positivelocking system that prevents critical military systems from accidentally separating due to vibration or contact stress. The MS3057-12AC is successfully used in many military applications, aerial telecommunication systems, robotic projects, dampening systems, RF transmission systems, navigation systems, aircraft weapon systems, defense weapons, power systems, and test and measurement equipment.