Rectangular connectors have modular bodies that accommodate different types of connections, including data, power, pneumatic air, and electric signals. Modular rectangular connectors are prebuilt assemblies with various connector modules to meet different industrial needs. Hoods, housings, and covers provide additional protection from water, dust, and cable strain. Inserts fit inside rectangular connector housings and create specific pin and socket configurations. Electrical contacts attach to the ends of conductors to create pins or sockets that fit inside inserts.