A buffer PSU is intended for an uninterrupted supply to alarm system devices requiring stabilized voltage of 12V DC (+/-15%). A linear stabilizing system, which has been used in the unit, provides voltage with a lower level of noise and a quicker response to interference when compared to a switched-mode regulator. The PSU provides voltage of Uout = 12,8V ÷ 13,8V DC during buffer operation. In case of power decay, a battery back-up is activated immediately. The PSU is housed in a metal enclosure which can accommodate a 17Ah/12V battery. It features a micro switch (TAMPER) that indicates door opening (front cover). Power supply: 230VAC/50Hz. Power supply output: 3A/13,8VDC. Battery charging current: 0,7A. Fitting battery: 17Ah/12V. Protections: SCP, OLP, UVP, tamper (opening of the enclosure). Dimensions: W=230 H=300 D+D1=92+8 [+/- 2mm]. Surface mounted enclosure, locking – bolted.