Enclosed AC-DC switching single output power supply with battery charger (UPS Function). Output voltage rate oscilating between 13.8 VDC and 54 VDC (depending on the chosen model, the current tension may vary from 10.5A to 2.7A, respectively). With power LED indicator and overloading protection, short-circuit and over voltage. Cooling by free air convection. Fixed switching frequency at PFC 67 KHz and PWM 134 KHz.