For use with these power supplies: WS-CAC-1300W, WS-CAC-2500W, PWR-2700-AC/4, PWR-2700-DC/4. Possibly will work with other models ...
C19, or IEC60320-C19 is a 3 prong, female connector commonly used on the end of high current computer and networking device power cords. This is likely the most common equipment end cord available today. This plug has a maximum current rating of 16 amps at 16-18AWG, 20 amps at 14-16AWG and able to handle a maximum of 250 volts. These ends plug into a C20, or IEC60320-C20.
6-20P, or NEMA 6-20P is a 3 prong, male connector commonly used for networking, entertainment, industrial, and laboratory equipment. This cord has a maximum current rating of 15 amps and can handle up to 250 volts.