MEAN WELL AD-55B 55W 13.8V DC Power Supply & Battery Charger

Reliable DC power for security systems, access control, and backup batteries often fails when a single supply must handle both steady loads and charging duties. The MEAN WELL AD-55B solves this by combining a 13.8V DC power supply with an integrated lead-acid battery charger in one compact, chassis-mountable unit.

Who is it for

Installers and integrators who need a dependable power source for CCTV cameras, alarm panels, electric locks, or other 12V DC equipment that also requires battery backup. It suits professional security, access control, and industrial automation projects where uptime is critical.

Main features

• Dual output: 13.8V DC / 3.5A for loads plus 13.4V DC / 0.23A charger for lead-acid batteries
• Wide input range: 88–264V AC or 125–373V DC, with 47–63Hz frequency support
• Built-in protections: overload, over voltage, and short circuit
• DC OK and battery low signal outputs for system monitoring
• Free air convection cooling – no fan, silent operation
• Complies with UL60950-1 and TUV EN60950-1 safety standards, EN55022 Class B EMC

Specifications

• Rated power: 55W
• Efficiency: 74% typical
• Ripple & noise: 120mVp-p
• Operating temperature: -10 to +60°C
• Mounting: chassis mount
• Battery type: lead-acid

Tips

For optimal battery life, use a sealed lead-acid battery with a capacity matched to your backup runtime needs. Ensure adequate ventilation around the unit, as it relies on convection cooling. The DC OK and battery low signals can be wired to a control panel for remote status monitoring.