Buffer power supplies have been designed in accordance with requirements of the (I and HAS) EN50131-6 2017 grade 1-3 and II environmental class and (KD) EN60839-11-2 2015+AC 2015 standard and I environmental class. Power supplies units are intended for an uninterrupted supply of alarm system devices requiring stabilized voltage of 12 or 24V DC (more less 15%).