A buffer PSU is intended for an uninterrupted supply to devices requiring stabilised voltage of 12V DC (+/-15%). The PSU provides voltage of U=13,8V DC. In case of power decay, a battery back-up is activated immediately. The PSU is constructed based on the switch mode PSU, with high energy efficiency. The PSU is housed in a metal enclosure (colour RAL 9003) which can accommodate a 65Ah/12V battery. Amicro switch indicates door opening (front cover). Power supply: 176÷264VAC/50Hz. Power supply output: 20A/13,8VDC. Battery charging current: 2A/4A/8A. Fitting battery: 65Ah/12V. Efficiency: 85%. Protections: SCP, OVP, OLP, UVP, OHP, tamper (opening of the enclosure). Dimensions: W=400, H=350, D+D1=173+8 [+/- 2mm]. Surface mounted enclosure, locking – bolted (lock assembly possible). Built-in power factor correction system (PFC). Forced cooling - built-in fan.