LAD120B 120W Enclosed Security and Fire Alarm Power Supply with Battery Charger Product overview A compact 1U enclosed AC/DC power supply designed for security and fire alarm systems. Provides stable load power and builtin battery charging for reliable UPS capability in a low profile, economical package. Key benefits Reliable dualfunction power: CH1 supplies the connected loads while CH2 provides battery charging and enables UPS operation when mains power fails. Flexible voltage options: factoryconfigurable outputs for 13.8V, 27.6V, 41.5V, or 55.2V to match common battery and system requirements. Wide AC input range: 90 VAC to 264 VAC input supports diverse installation environments. Fine output adjustment: CH1 voltage adjustable from 20 percent to +5 percent to accommodate different battery types and precise system tuning. Comprehensive protection: builtin protections for short circuit, overload, overvoltage, overtemperature, battery overcharge and undervoltage, and reverse polarity to protect equipment and battery. Compact enclosed design: 1U thin profile for easy mounting in cabinets or control panels while keeping wiring and battery connections contained. Technical highlights Output power: 120 W continuous. Outputs: selectable nominal voltages 13.8 V, 27.6 V, 41.5 V, 55.2 V. Battery function: dedicated charger output with UPS operation when main power is lost. Input range: 90 VAC to 264 VAC for global compatibility. Adjustable CH1 output: 20 percent to +5 percent adjustment range for system compatibility and battery management. Safety and fault handling: automatic responses for short circuit, overload, overvoltage, overtemperature, battery overcharge, battery undervoltage, and reverse polarity conditions. Designed for economical installations where space, reliability, and battery backup are required. Typical applications Security control panels and alarm systems requiring continuous power and battery backup for sensors, detectors, and control modules. Emergency lighting and access control installations where a compact power source must maintain lights, locks, and control electronics during mains outages. Central monitoring rooms and equipment closets supplying power and UPS support to networked peripherals and surveillance components. Compatibility and options Intended for use with sealed lead acid and other common battery types when configured to the appropriate nominal output and charge settings. The product line includes basic enclosed models; higher wattage versions offer additional features such as communication interfaces. Why choose this unit Provides a practical balance of power, battery charging, adjustability, and protections in a compact, enclosed form factor suitable for a wide range of security, fire protection, and UPS support roles.