MEAN WELL LAD-360 Series 360W Security & Fire Alarm Power Supply with Battery Charger & UPS

Overview of MEAN WELL LAD-360 Series

The MEAN WELL LAD-360 Series combines regulated DC output, dedicated battery charging, UPS backup control and system monitoring in a low-profile 360W AC/DC security and fire alarm power supply. It is designed for fire emergency, security, public safety backup and other systems that require normal DC operation together with battery-supported operation when AC mains power becomes abnormal.

During normal AC operation, the LAD-360 supplies power to the connected load while charging the external battery. If the AC input becomes abnormal, the built-in UPS function switches the power source to battery backup so connected equipment can continue operating during mains interruption. The series also supports forced UPS operation, while the UART versions additionally provide remote UPS control for integration with fire alarm and evacuation systems.

The series is available in three output versions. LAD-360B provides a 27.6V main output rated at 11.5A, LAD-360C provides 41.5V at 7.14A, and LAD-360D provides 55.2V at 5.03A. Each model also provides a dedicated 1.5A battery charging output. UART communication versions are available as LAD-360BU, LAD-360CU and LAD-360DU, and the series is suitable for both lead-acid and lithium-ion batteries.

For system monitoring, the standard LAD-360 versions provide TTL status signals for AC OK, battery disconnect or reverse polarity, battery low, battery full and discharge status. The UART versions support communication-based monitoring and control, including power supply status, battery voltage information, main voltage, output voltage and output current. They also provide buzzer alarm functionality and additional battery-related control features.

Built-in protection functions include short circuit, overload, overvoltage, overtemperature, battery low-voltage protection and battery reverse-polarity protection. With a low-profile 215 × 115 × 30 mm design, built-in AC and battery circuit ON/OFF switches and efficiency up to 86.5%, the LAD-360 Series is suitable for fire emergency and evacuation systems, public safety battery backup, security systems, DC UPS systems, central monitoring systems and industrial automation.

Features

• 360W AC/DC power supply with integrated battery charger and UPS backup function
• 27.6V, 41.5V and 55.2V output versions for different battery-backed DC system architectures
• Dedicated 1.5A battery charging output with support for lead-acid and lithium-ion batteries
• Automatic transfer to battery backup when AC input becomes abnormal
• TTL status monitoring on standard LAD-360B, LAD-360C and LAD-360D models
• UART communication and additional UPS control functions on LAD-360BU, LAD-360CU and LAD-360DU
• Protection against short circuit, overload, overvoltage, overtemperature, battery low voltage and reverse polarity
• Low-profile 215 × 115 × 30 mm chassis with built-in AC and battery circuit switches

Need help choosing a model? Start with the required output voltage, then decide whether your system needs simple TTL status monitoring or UART-based communication and control.

Model Selection Guide for LAD-360 Series

Choosing a LAD-360 model mainly comes down to two questions: what DC voltage does your system require, and do you need TTL status signals or UART communication?

Step 1: Choose the Required Output Voltage

• LAD-360B / LAD-360BU: 27.6V output, up to 11.5A
• LAD-360C / LAD-360CU: 41.5V output, up to 7.14A
• LAD-360D / LAD-360DU: 55.2V output, up to 5.03A

All versions include a dedicated 1.5A battery charging output.

Step 2: Choose TTL or UART

Choose LAD-360B, LAD-360C or LAD-360D when your controller only needs discrete status signals such as AC OK, battery low, battery full, battery disconnect and discharge.

Choose LAD-360BU, LAD-360CU or LAD-360DU when the system requires UART-based monitoring, remote UPS control, battery-related data or closer integration with a fire alarm, evacuation or central monitoring controller.

Step 3: Check the Battery and Backup Requirements

The LAD-360 Series can be used with lead-acid and lithium-ion batteries. Confirm the battery voltage, required backup duration, load current and charging requirements before final model selection.

For systems that require emergency testing or externally commanded backup operation, also check whether forced UPS or remote UPS control is required.

Typical selection example: A 24V-class backup system that only needs hardware status signals would normally use LAD-360B, while the same voltage class with UART monitoring and remote control requirements would use LAD-360BU.

Related MEAN WELL LAD, PSC and Security Power Supplies

For security systems, fire alarm systems, emergency power, central monitoring and battery backup applications, the following MEAN WELL power supplies can be compared with the LAD-360 Series according to required output power, output voltage, battery charging capability, UPS function, monitoring requirements, communication functions and installation format:

• LAD-120 Series – Lower-power LAD Series security and fire alarm power supply with integrated battery charger, UPS backup function and TTL status monitoring for applications requiring less output capacity than LAD-360.
• LAD-240 Series – 240W LAD Series security and fire alarm power supply with battery charger, UPS backup function and TTL status monitoring for systems requiring less load power and charging capacity than LAD-360.
• LAD-600 Series – Higher-power LAD Series security and emergency backup power solution for systems requiring substantially greater output capacity, battery charging and UPS operation than LAD-360.
• PSC-35 Series – Lower-power AC/DC power supply with integrated battery charger and UPS backup function for security and battery-backed DC applications with lighter load requirements.
• PSC-60 Series – Compact 60W power supply with battery charger and UPS function for applications requiring significantly lower output power than LAD-360.
• PSC-100 Series – 100W battery charger power supply with UPS backup function for security, alarm and DC backup applications requiring lower output power.
• PSC-160 Series – 160W AC/DC power supply with integrated battery charger and UPS backup function for systems requiring moderate output power below the LAD-360 Series.
• DRC-100 Series – DIN rail security power supply with battery charging and automatic backup operation for applications that require DIN rail mounting rather than a low-profile chassis.
• DRC-180 Series – Higher-power DIN rail AC/DC power supply with battery charger and UPS function for security and backup systems that require TS35 rail installation.
• DRS-240 Series – Intelligent DIN rail security power supply integrating AC/DC power, battery charger, DC UPS, status monitoring and communication functions for advanced backup power and supervisory applications.
• DRS-480 Series – Higher-power intelligent DIN rail security power supply with battery charging, DC UPS, monitoring and communication functions for systems requiring more advanced control and greater output capacity.

Need help selecting the right MEAN WELL security power supply?
Compare LAD, PSC, DRC and DRS Series based on required output voltage, load power, battery charging current, UPS backup operation, TTL or UART monitoring, communication functions and installation format.

Battery Backup and Monitoring Functions

The MEAN WELL LAD-360 Series is designed to operate as both a normal DC power supply and a battery-backed power source. During normal AC operation, the unit powers the connected load while charging the external battery. If the AC input becomes abnormal, the UPS function transfers the system to battery operation.

TTL Status Monitoring

Standard LAD-360B, LAD-360C and LAD-360D models provide TTL status signals for:

• AC OK
• Battery disconnect or reverse polarity
• Battery low
• Battery full
• Discharge status

These signals allow a host controller or alarm system to monitor basic power and battery conditions without using a digital communication protocol.

UART Monitoring and Control

The LAD-360BU, LAD-360CU and LAD-360DU versions are intended for systems that need more than simple status contacts. UART communication can provide operating and fault information, battery-related data, input and output information, and selected control functions.

This makes the U versions better suited to centralized monitoring, fire alarm and evacuation systems where the power supply needs to exchange information with an external controller.

Forced and Remote UPS Operation

The LAD-360 platform supports forced UPS operation for maintenance, testing or emergency use. UART versions also provide remote UPS control so an external system can command backup operation when required.

Need detailed signal logic or connector information? Refer to the official LAD-360 Series datasheet for TTL signal levels, UART functions, forced-start behavior and CN2 pin assignments.

Mechanical Dimensions and Installation

The MEAN WELL LAD-360 Series uses a low-profile 215 × 115 × 30 mm chassis designed for integration into security, fire alarm, emergency backup and DC UPS equipment.

The mechanical drawing shows the main mounting points, TB1 power terminals, CN2 control connector, AC ON/OFF switch, battery circuit switch and recommended airflow direction.

Power and Battery Connections

TB1 provides connections for AC input, protective earth, DC output and the external battery. The DC output negative and battery negative terminals are separate and must be wired according to the MEAN WELL installation requirements.

Control Connections

Standard LAD-360B, LAD-360C and LAD-360D models use CN2 for TTL status signals and forced UPS control.

UART models LAD-360BU, LAD-360CU and LAD-360DU use a larger CN2 interface for UART communication, forced start, remote UPS control, battery type selection and battery inspection functions.

Installation Considerations

The LAD-360 Series operates from -20°C to +60°C, with output derating required at higher ambient temperatures. Adequate airflow should be maintained in the final enclosure, particularly when the power supply operates near full load.

Optional mounting brackets are also available for installations requiring additional mechanical support.

For final wiring and enclosure design, use the official LAD-360 mechanical drawing and datasheet to confirm terminal assignments, mounting dimensions, connector pinouts and ventilation requirements.

Applications

The MEAN WELL LAD-360 Series is intended for systems that need regulated DC power, battery charging and automatic backup operation in the same power platform.

Its combination of three output-voltage options and either TTL or UART monitoring makes it suitable for both standalone backup installations and systems that need integration with a central controller.

• Fire emergency and evacuation systems requiring battery-backed DC power during AC mains interruption
• Security systems requiring regulated DC output and battery backup
• Public safety backup systems requiring continued operation from an external battery
• DC UPS systems requiring automatic transfer to battery-supported operation
• Central monitoring systems using TTL or UART for power and battery status monitoring
• Industrial control systems requiring an integrated DC supply, charger and backup power function

Certifications and Safety

The MEAN WELL LAD-360 Series is designed for use as a component power supply in security, fire alarm and battery-backed DC systems.

The series carries safety approvals including UL62368-1, BS EN/EN62368-1, AS/NZS62368.1 and EAC TP TC 004. The product design also references relevant fire and alarm system requirements, including GB 17945-2010 and, for UART versions, GB 4717.

EMC and Electrical Safety

The LAD-360 Series is specified for Class A conducted and radiated emissions and includes immunity testing to the applicable EN61000-4 standards.

Electrical isolation includes:

• Input to output: 3KVAC
• Input to FG: 2KVAC
• Output to FG: 0.5KVAC

Protection Functions

Built-in protection includes short circuit, overload, overvoltage, overtemperature, battery low voltage and battery reverse polarity.

The battery charger uses current limiting, and battery reverse-polarity protection is designed to prevent damage if the battery is connected incorrectly.

Final Equipment Compliance

The LAD-360 is a component power supply. EMC, thermal performance, wiring, grounding and overall safety must therefore be verified in the completed equipment.

For certification-sensitive projects, review the current MEAN WELL datasheet and applicable approval documents before final product qualification.