Identifying computer power cables and knowing their purpose is a must for anyone working inside a computer. The 4-pin, 12V connector is typically used to supply power to the central processing unit (CPU). The physical construction and operating capacity of the 4-Pin, 12V connector is defined in the advanced technology extended (ATX) 12V power supply standard.
Purpose
The 4-pin,12V connector is used to supply additional power to the motherboard. The most common use of this connector is to provide a 12-volt power source for the CPU. Motherboards that require this connector are known as ATX 12V motherboards.
Construction
The 4-pin, 12V connector is composed of four wires that provide two 12-volt power lines using 18 AWG wire. The wires are color coded black for the COM signal lines and yellow with a black stripe for the 12-volt lines.
Configuration
The ATX 4-pin connector uses four pins surrounded by plastic molding arranged in a square pattern. The plastic molding around the metal contacts of the connector are alternately shaped in a square and domed square configuration to ensure the pins are connected in the correct order.
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