Two pin sizes are common in the jacks for this size plug body, 2.1 mm (0.083 in) and 2.5 mm (0.098 in), and the plugs should match. Many non-proprietary co-axial power plugs are 5.5 mm (0.22 in) in outside diameter (OD) and 9.5 mm (0.37 in) in length. Generic plugs are often named for the pin diameter they are designed to take. Most of the other coaxial DC power connectors have no specified voltage association, however. The Japanese EIAJ standard includes five different sizes, with each supporting a specified range of voltages.
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In addition to a plethora of generic designs (whose original designer is unknown) there are at least two different national standards- EIAJ in Japan and DIN in Germany, plus the JSBP connector used on some laptop computers. There are a wide variety of sizes and designs for these power connectors, and many appear quite similar to each other yet are not quite mechanically or electrically compatible. The outer plug contact is often called the barrel, sleeve or ring, while the inner one is called the tip. A pin mounted in the socket makes contact with a second internal contact.
Inverted polarity plugs can, and do, damage circuitry when plugged in, even if the voltage is correct not all equipment is equipped with protection. The outer body of the plug is one contact, most often but not always the negative side of the supply. Some of these jacks contain a normally closed contact, which can be used to disconnect internal batteries whenever the power supply is connected, avoiding the risk of battery leakage or explosion posed by incorrect recharging of the batteries.Ĭylindrical plugs usually have an insulated tip constructed to accept insertion of a pin. The matching jack or socket is permanently fitted to the equipment to be powered. The intended use of these plugs is on the cable connected to an external AC adapter ( power supply). They may be known as "coaxial power connectors", "barrel connectors", "concentric barrel connectors" or "tip connectors". Small cylindrical connectors come in a variety of sizes.
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