MEAN WELL AD-55B is an enclosed AC/DC power supply with a battery-charger and UPS function. Its main CH1 output is rated for 27.6V at 1.8A, while CH2 provides a 26.5V, 0.16A battery-charging output; total rated power is 53.92W. The unit supports AC charging mode and UPS mode, with battery-low protection and an optional DC alarm signal. Confirm battery compatibility, charge requirements, wiring, finished-enclosure cooling, and system-level safety before installation.Technical details below were checked against the MEAN WELL English series datasheet. Confirm final wiring, protection coordination, enclosure design, cooling, and derating against the datasheet before system integration.Features UPS and battery-charger function - Combines a main DC output with a dedicated battery-charging output for qualified UPS applications. Dual output arrangement - CH1 is rated for 27.6V at 1.8A and CH2 is rated for 26.5V at 0.16A. Universal AC/DC input - Accepts 88-264VAC or 124-370VDC input at 47-63Hz according to the English datasheet. Battery-low protection - The AD-55B battery-low threshold is specified as 20-22V. Optional DC alarm - Provides an optional DC alarm signal through CN1 for AC-fail and battery-low conditions. Protection functions - Includes short-circuit, overload, and over-voltage protection; UPS-mode protection is provided by an internal fuse. Cooling - Designed for free-air convection; confirm final enclosure airflow and derating. Warranty - MEAN WELL lists a 2-year warranty for the AD-55 series. Specifications Product MEAN WELL AD-55B UPS power supply with battery charger Series AD-55 CH1 rated output 27.6VDC, 1.8A (0-2A current range) CH2 battery-charging output 26.5VDC, 0.16A Rated power 53.92W CH1 output-voltage adjustment range 24-29V CH1 ripple and noise 100mVp-p maximum Input voltage range 88-264VAC or 124-370VDC Input frequency 47-63Hz Typical efficiency 74% Overload protection 105-150% rated output power; AC charging mode hiccup recovery, UPS mode protected by internal fuse Over-voltage protection CH1 31.74-37.26V; hiccup recovery Battery-low protection 20-22V DC alarm signal Optional; CN1 pin 2 AC fail and CN1 pin 1 battery low under charge voltage Operating ambient -10 to 60C; follow the datasheet derating curve Cooling Free-air convection Dimensions 159 x 97 x 38mm Weight 0.5kg Warranty 2 years Reference DocumentsMEAN WELL AD-55 Series Datasheet - English PDFApplication Backup-power equipment - Use with a compatible battery and qualified system wiring after confirming charge and backup requirements. Security and access systems - Integrate in a validated finished system after reviewing battery-low and DC-alarm behavior. Industrial control backup - Use only after confirming output loading, battery compatibility, protection coordination, and enclosure conditions. Telecom or distributed equipment - Apply the AC/DC and UPS functions within the complete system's documented electrical and safety design. Packing List Item Quantity MEAN WELL AD-55B UPS power supply with battery charger x1 FAQ.faq-accordion details{border-bottom:1px solid #e6eef8;padding:14px 0}.faq-accordion summary{cursor:pointer;font-size:16px;font-weight:700;color:#1f2933}.faq-accordion p{margin:12px 0 0;color:#4b5563;line-height:1.65} What outputs does the AD-55B provide?CH1 is rated for 27.6V at 1.8A and CH2 provides 26.5V at 0.16A for battery charging; total rated power is 53.92W. Does it include a UPS and charging function?Yes. The AD-55B combines a battery-charger output with an AC/DC UPS function for compatible finished systems. What input voltage does it accept?The English datasheet lists 88-264VAC or 124-370VDC at 47-63Hz. What happens in a battery-low condition?The AD-55B battery-low threshold is specified as 20-22V. Confirm the complete battery system design before use. Does it have an alarm signal?An optional DC alarm signal is available through CN1 for AC-fail and battery-low conditions. What is included?The packing list includes one MEAN WELL AD-55B UPS power supply with battery charger.
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