The buffer power supply is an electrical device that converts 230 V mains voltage into DC voltage. Its specificity is that it can be connected to an external battery from which energy will be drawn in the event of a 230 V voltage failure, which will ensure continuous operation of the receiving device. The perforated metal casing facilitates air flow, resulting in more effective cooling of the device. Appropriately marked screw terminals are used to connect cable terminals in accordance with electrical principles, and the range of required output voltage can be adjusted by the installer using a potentiometer.