A buffer power supply is an electrical device that converts 230 V mains voltage into DC voltage. Its specificity is that we can connect an external battery from which energy is drawn in the event of a 230 V voltage failure to ensure continuous operation of the receiving device. The perforated metal casing facilitates air flow, which increases the cooling efficiency of the device. The screw terminals are marked accordingly and are used to connect cable outlets in accordance with electrical principles. The installer can adjust the output voltage within a certain range using a potentiometer.