AD-155A — 155W AC/DC Power Supply with UPS Function and Battery Charger

The AD-155A is an AC/DC enclosed power supply manufactured by Taiwanese company MEAN WELL, featuring a built-in UPS (Uninterruptible Power Supply) function and battery charger.

The AD-155A series is designed for security systems (fire and intrusion alarm systems), access control systems, and other critical applications requiring reliable and uninterrupted power supply.

Operating Principle

The backup power unit (consisting of the AD-155A switching power supply and battery charger):

• supplies the load and charges the battery during normal operation;

• automatically switches the load to battery power in case of AC mains failure;

• initial battery charging is performed using a separate charger.

Key Features

• Built-in UPS function

• Increased battery charging current

• Integrated diagnostic circuits

• 10% higher efficiency compared to previous models (e.g., AD-155)

• Metal enclosure

• High reliability (MTBF up to 1,818,000 hours according to Telcordia SR-332)

Protection Features

The AD-155A includes comprehensive protection:

• Short circuit protection

• Overvoltage protection

• Battery reverse polarity protection (fuse)

• Automatic battery low-voltage disconnect

• Constant current limiting in charging mode

• Internal fuse protection in UPS mode

These protections ensure safe and reliable system operation.

General Specifications

• Power: up to 155W

• Type: single output power supply with battery charger

• Ripple & noise: up to 150–240 mVp-p

• Voltage tolerance: ±1.0…±2.0%

• Withstand voltage:

  • I/P-O/P: 3KVAC

  • I/P-FG: 2KVAC

  • O/P-FG: 0.5KVAC

• Isolation resistance: 100 MΩ / 500VDC

Important

⚠ Batteries are not included and must be ordered separately.