4 channel cctv camera power supply A 24V 5A power supply is a high-capacity power supply unit that converts AC (alternating current) voltage from a wall outlet into a stable 24-volt DC (direct current) output. This type of power supply is commonly used in various applications that require a higher voltage and current capacity, such as powering industrial machinery, robotics systems, and LED lighting setups. It typically has a barrel-type connector or terminal block on the output side that connects to the device.