MEAN WELL AD-155B 155W 27.6V 3.5A Battery Charger Power Supply with UPS Function

In industrial automation and security systems, reliable backup power is critical. The MEAN WELL AD-155B is a 155W battery charger power supply that combines a 27.6V DC main output for powering loads with a dedicated 27.1V charger output for maintaining a 24V lead-acid battery. Its built-in UPS function ensures seamless transfer to battery power during AC outages, while the AC OK and Battery Low signals allow remote monitoring of system status.

Key specifications

• Total rated power: 155W
• Main output: 27.6V DC, 3.5A
• Charger output: 27.1V DC, 0.5A
• Wide input range: 88~264VAC or 124~370VDC
• Efficiency: 84% typical
• Protections: overload, over voltage, battery low disconnect, battery reverse polarity (by fuse)
• Cooling: free air convection
• Operating temperature: -10°C to +60°C
• Safety: UL60950-1, TUV EN60950-1 approved
• EMC: EN55022 class B, EN61000-3-2,3, EN61000-4-2,3,4,5,6,8,11
• Signals: AC OK, Battery Low
• Mounting: chassis mount

Why choose it

The AD-155B integrates power supply and battery charger functions in a single compact unit, reducing wiring and component count. Its UPS capability ensures uninterrupted operation of critical equipment, and the status signals enable proactive maintenance. With a wide input voltage range and robust protections, it is suitable for demanding industrial environments.

Ideal use cases

• Security and access control systems
• Industrial automation and control panels
• Emergency lighting and alarm systems
• Telecommunications equipment
• Any 24V battery-backed application

Good to know

The AD-155B is designed for use with 24V lead-acid batteries. It operates with free air convection, so ensure adequate ventilation around the unit. The chassis mount design allows for easy installation inside enclosures. For battery reverse polarity protection, a fuse is included.