CMC and CMX Sealed, Hybrid, Modular Connectors CMC and CMX connector family from Molex is an IP6K9k sealed, modular, high-density and hybrid connection system developed for the transportation industry. CMC and CMX connectors are designed to perform in high-conductivity applications and in harsh environments. These connection systems are used in power train applications including engine-control units (ECU’s), compartment applications, gearboxes, electronic parking brakes and suspension where currents are needed for up to 21.0A.