MEAN WELL AD-55A Dual Output Power Supply with UPS Function 13.8V DC 3.5A & 13.4V DC 0.2A Charger

Security systems, access control panels, and backup battery setups often fail when the main power drops—unless the power supply itself is smart enough to bridge the gap. The MEAN WELL AD-55A is a 51.6W enclosed power supply with a built-in UPS function and dual outputs, delivering 13.8V DC at 3.5A for the main load and 13.4V DC at 0.2A for battery charging. It keeps your critical equipment running and your backup battery topped up from a single compact unit.

Who is it for

This power supply is ideal for installers and system integrators working on security, surveillance, access control, or any 12V DC equipment that requires battery backup. It suits applications where uninterrupted operation is essential and where a separate charger would add cost and complexity.

Main features

• Dual output: 13.8V DC / 3.5A main output plus 13.4V DC / 0.2A charger output for sealed lead-acid batteries.
• Integrated UPS function: automatically switches to battery power when AC input fails, with AC OK and Battery Low signal outputs for monitoring.
• Wide input range: 88–264V AC or 120–370V DC, suitable for global use.
• Comprehensive protection: overload, over voltage, short circuit, battery low voltage disconnect, and reverse polarity protection (by fuse).
• Safety certified: meets UL60601-1, TUV EN60601-1, and CE standards, with high isolation voltage (3000VAC input to output).
• Compact enclosed metal case, easy to mount in control panels or equipment cabinets.

Specifications

• Output voltage (main): 13.8V DC
• Output current (main): 3.5A
• Output voltage (charger): 13.4V DC
• Output current (charger): 0.2A
• Rated power: 51.6W
• Input voltage: 88–264V AC (120–370V DC)
• Frequency: 47–63 Hz
• Efficiency: 78%
• Ripple & noise (main output): 120mVp-p
• Overload protection: 105–150% rated power, hiccup mode, auto-recovery
• Over voltage protection (main output): 15.5–18.2V
• Operating temperature: -10 to +60°C
• Safety standards: UL60601-1, TUV EN60601-1, CE
• Isolation voltage: I/P-O/P 3000VAC, I/P-FG 1500VAC, O/P-FG 500VAC
• Signals: AC OK, Battery Low
• Mounting: enclosed, chassis mount

Tips

When connecting a backup battery, use a sealed lead-acid battery with a capacity appropriate for your load and desired backup time. The charger output is designed for float charging; ensure the battery voltage matches 12V nominal. Monitor the AC OK and Battery Low signals to trigger alarms or notifications in your system for proactive maintenance.