Contact All Suppliers Power Supply Units

Power Supply Units convert mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use switched-mode power supplies. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the mains voltage. Most modern desktop personal computer power supplies conform to the ATX specification, which includes form factor and voltage tolerances. While an ATX power supply is connected to the maintenance supply, it always provides a 5 Volt standby voltage so that the standby functions on the computer and certain peripherals are powered.