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DC-099 5.5mm x 2.1mm Female jack 3 pin PCB Panel mount DC power connector with cover pack of 20pcsThis is a 5.5mm x 2.1mm Female DC power jack socket. This socket comes with a Metal nut to mount the jack in your application. It has a plastic cover which provides a tight connection with a male pin. The center pin can be 2.1mm or 2.5mm. In addition, the male plug is 2.5mm/2.1mm x 5.5mm also provides good environmental protections. It is widely used in small-scale as well as prototyping projects where 12V to 30V power supply is needed such as household appliances, electric force, telecommunications, machine tool, vessel, textile, printing, Mining machine, Music Instrument, etc.Excellent copper contacting or mating materialSuitable for 12V to 30 V 1A ApplicationsAvoid the polarity conflict and short circuit.