Description
The MEAN WELL LAD-120A is an industrial-grade, 1U low-profile (30mm) enclosed AC/DC power supply engineered specifically for mission-critical fire safety, access control, and uninterrupted security infrastructure. Featuring a dual-channel design, the unit provides a continuous 13.8V DC rail for primary load power while simultaneously delivering dedicated current to an auxiliary lead-acid or lithium battery backup system. In the event of AC grid failure, the internal bypass architecture executes zero-transfer-time switchover to battery power, preventing controller reboots, peripheral drops, or communication bus degradation.
Built with comprehensive signal monitoring interfaces, the LAD-120A provides discrete TTL output diagnostics for AC OK, Battery Disconnect/Reverse Polarity, Battery Low, and Battery Full states. Built-in battery protections include reverse polarity shielding and low-voltage cut-off to prevent battery degradation from deep discharge cycles.
Technical Specifications:
Manufacturer: MEAN WELL
Model: LAD-120A
Product Category: AC/DC Security Power Supply with DC-UPS
Primary Channel Output (CH1): 13.8V DC
Primary Current Range (CH1): 0 to 8.7 A
Battery Charging Output (CH2): 13.8V DC
Battery Charging Current (CH2): 1.5 A
Combined Maximum Output Power: 120 W
AC Input Voltage Range: 90 to 264V AC
DC Input Voltage Range: 127 to 370V DC
Input Frequency Range: 47 to 63 Hz
Power Conversion Efficiency: 86.5%
Battery Low Cut-off Threshold: 10.5V ± 0.3V DC
Signaling and Diagnostics: TTL Open Collector (AC OK, Battery Low, Battery Reverse/Open)
Protection Mechanisms: Short Circuit, Overload (105-135%), Over Voltage, Battery Reverse Polarity, Deep Discharge
Thermal Management: Free-Air Convection (Fanless)
Operating Temperature Range: -20°C to +70°C (Refer to output derating curve)
Operating Humidity: 20% to 90% RH Non-Condensing
Form Factor: 1U Low Profile Enclosure
Dimensions (L x W x H): 159 x 97 x 30 mm
Weight: 0.43 kg
Safety Certifications: UL62368-1, BS EN/EN62368-1, AS/NZS 62368.1, GB4943.1
EMC Compliance: EN55032 Class B, EN61000-3-2 Class A, EN61000-4-2, 3, 4, 5, 6, 8, 11
Industrial Application Scenario:
In centralized Fire Alarm Control Panels (FACP) and automated building security racks, continuous operation across transient power outages is mandatory. The LAD-120A addresses this requirement by delivering clean, ripple-suppressed 13.8V DC power directly to microprocessor logic, sensor loops, and motorized latch hardware while managing a 12V SLA standby battery. Upon mains failure, the zero-loss switchover maintains full loop supervision and reporting integrity. The TTL diagnostic lines feed real-time telemetry back to the central supervisory PLC/SCADA controller, triggering remote alerts prior to reaching critical battery depletion thresholds.
Engineering Verification and Supply Assurance:
Original Engineering standards from MEAN WELL ensure strict component selection, high mean time between failures (MTBF), and adherence to international electromagnetic compatibility regulations. Broad Technical Compatibility allows straightforward drop-in integration with legacy 12V/13.8V power distribution panels, access panels, and emergency lighting arrays. Standard factory Lead Time and stock availability support immediate maintenance procurement and scalable OEM production runs.
Key Attributes
Input Voltage: 90 ~ 264VAC 127 ~ 370VDC
Output Current: 13.8V7.7A/13.8V1A
Output Voltage: 13.8V/13.8V
Place of Origin: Jiangsu, China
Model Number: LAD-120A
Brand Name: MEANWELL
Application: CCTV, Industry, Laboratory, Smart Home, Industrial Equipment, 3D Printer, Led Lighting, Machines, Battery Charging, Industrial Din Rail Power Supply
Efficiency: 86%
Output Frequency: 47 ~ 63Hz
Output Type: Other
Protection: Short Circuit Protection, Overcurrent Protection, Overvoltage Protection, Over Temperature Protection, Overloading Protection
Type: AC-DC
Packaging and Delivery
Selling Units: Single item
Single package size: 16X10X3 cm
Single gross weight: 0.500 kg
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