MEAN WELL DRS-240 Series 240W DIN Rail Security Power Supply with DC UPS & Battery Charger

Overview of MEAN WELL DRS-240 Series

The MEAN WELL DRS-240 Series is a 240W all-in-one intelligent AC/DC DIN rail security power supply integrating power supply, DC UPS, battery charger and status monitoring functions. It is designed for security systems, fire alarm systems, access control, emergency lighting, central monitoring systems, industrial automation and other applications that require reliable battery-backed DC power during AC mains interruption.

Unlike a conventional DIN rail power supply, the DRS-240 Series combines the main DC output, battery charging, UPS backup control and system supervision in a single unit. When AC mains power is available, the unit supplies the connected load while charging the battery. If AC input fails, the DC UPS function switches the load to battery power, creating a practical DIN rail UPS power supply architecture for security, monitoring, alarm and access control systems. The series also supports battery start, allowing the system to start directly from the connected battery without AC input.

The series accepts a wide 90–305VAC input and also supports 127–431VDC input, with built-in active PFC. Four models are available: DRS-240-12 provides 12V output with up to 20A load current, DRS-240-24 provides 24V output with up to 10A, DRS-240-36 provides 36V output with up to 6.6A, and DRS-240-48 provides 48V output with up to 5A. Combined output power across the load and battery charging channels must not exceed 240W, with the load given priority.

For battery charging, the DRS-240-12 provides up to 15.4A charging current, while the DRS-240-24, DRS-240-36 and DRS-240-48 provide up to 7.7A, 5.1A and 3.85A respectively. Charging current can be adjusted from 20% to 100%, and 2-stage or 3-stage charging can be selected by DIP switch. The series supports lead-acid batteries and supported lithium-ion battery systems, and also provides battery temperature compensation for lead-acid battery charging.

For system supervision, the DRS-240 Series provides AC Fail, Battery Low, Charger Fail and DC OK status signals through Form-C relay contacts and LED indicators. Relay contacts are rated up to 30VDC / 1A, allowing alarm panels, controllers and central monitoring systems to supervise power supply, battery and charger conditions.

The series also supports intelligent communication and parameter configuration. Standard DRS-240 models provide built-in MODBus communication, while DRS-240-xxCAN versions provide CANBus communication. Charging parameters on CANBus versions can also be configured using the optional SBP-001 programmer, supporting integration into more advanced security and monitoring systems.

Built-in protection functions include short circuit, overload, overvoltage, over-temperature protection, battery cut-off and battery reverse polarity protection. The series operates by free-air convection over a wide -30°C to +70°C operating temperature range and can be mounted on TS35/7.5 or TS35/15 DIN rail for installation inside security enclosures, control cabinets and industrial equipment.

For OEM, system integration and industrial procurement, the DRS-240 Series provides four main voltage options: MEAN WELL DRS-240-12, DRS-240-24, DRS-240-36 and DRS-240-48. The series is particularly suitable where a 240W DIN rail power supply, intelligent battery charger, DC UPS backup, alarm signaling and communication functions are required in one compact security power solution.

Features

• 240W all-in-one DIN rail security power supply integrating AC/DC power supply, DC UPS, battery charger and status monitoring functions
• Wide 90–305VAC input and 127–431VDC input capability with built-in active PFC
• Power factor greater than 0.98 at 115VAC and greater than 0.95 at 230VAC under full load
• Available in DRS-240-12, DRS-240-24, DRS-240-36 and DRS-240-48 models for 12V, 24V, 36V and 48V nominal DC systems
• DRS-240-12 provides 12V output with up to 20A load current and maximum 15.4A battery charging current
• DRS-240-24 provides 24V output with up to 10A load current and maximum 7.7A battery charging current
• DRS-240-36 provides 36V output with up to 6.6A load current and maximum 5.1A battery charging current
• DRS-240-48 provides 48V output with up to 5A load current and maximum 3.85A battery charging current
• Combined output power across the load and battery charging channels must not exceed 240W, with load current given priority
• 20–100% battery charging current adjustment by internal VR
• Selectable 2-stage or 3-stage charging curve by DIP switch
• Suitable for lead-acid batteries including flooded, Gel and AGM types, as well as supported lithium-ion battery systems
• Battery temperature compensation function for lead-acid battery charging using the supplied NTC temperature sensor
• Built-in DC UPS function switches the load to battery power within 10ms after AC mains failure
• Battery start function allows the system to start directly from the connected battery without requiring AC input
• Power Boost capability supports up to twice the rated load current for a maximum of 4 minutes and three times the rated load current for a maximum of 4 seconds
• Form-C relay contacts and LED indicators provide AC Fail, Battery Low / Abnormal / Disconnected, Charger Fail and DC OK status monitoring
• Form-C relay contact outputs support a maximum rating of 30VDC / 1A
• Built-in MODBus communication on standard DRS-240 models for system monitoring and charging parameter configuration
• Optional DRS-240-xxCAN models provide CANBus communication and support charging curve configuration using the optional SBP-001 programmer
• Battery low thresholds are below 11 ±0.2V, 22 ±0.3V, 33 ±0.4V and 44 ±0.5V for the 12V, 24V, 36V and 48V models respectively
• Battery cut-off levels are 10.5 ±0.3V, 20.9 ±0.5V, 31.3 ±0.7V and 41.8 ±1V for the 12V, 24V, 36V and 48V models respectively
• Built-in protection against short circuit, overload, overvoltage and over-temperature conditions
• Battery reverse polarity protection by internal MOSFET prevents damage and automatically recovers after the fault condition is removed
• Fanless design with free-air convection cooling for low-maintenance operation
• Wide operating temperature range from -30°C to +70°C, subject to the datasheet derating curve
• 85.5 × 125.2 × 129.2 mm enclosure for DIN rail installation inside security enclosures, control cabinets and industrial equipment
• Compatible with TS35/7.5 and TS35/15 DIN rail installation
• Efficiency up to 92%, depending on output model
• Safety approvals include UL62368-1, BS EN/EN62368-1, AS/NZS 62368.1 and EAC TP TC 004
• Signal and alarm design supports requirements associated with UL2524, NFPA 1221, BS EN/EN54-4 and GB17945
• Suitable for public safety battery backup, security systems, emergency lighting, alarm systems, DC UPS systems, battery detection, central monitoring and industrial automation
• 3-year manufacturer warranty

Need help choosing the right output voltage and battery configuration? Compare DRS-240-12, DRS-240-24, DRS-240-36 and DRS-240-48 below.

Model Selection Guide for DRS-240 Series

The MEAN WELL DRS-240 Series includes four 240W all-in-one DIN rail security power supply models with integrated battery charger, DC UPS and status monitoring functions. Engineers, OEM buyers and system integrators can select between DRS-240-12, DRS-240-24, DRS-240-36 and DRS-240-48 primarily according to the required DC system voltage, load current, battery capacity, charging current and communication interface.

All four models share the same wide 90–305VAC input, 127–431VDC input capability, active PFC, DC UPS function, battery start, adjustable charging current, selectable 2-stage or 3-stage charging, Form-C relay monitoring, free-air convection cooling and TS35 DIN rail mounting. The main differences are output voltage, maximum load current, maximum battery charging current, recommended battery capacity and battery protection thresholds.

DRS-240-12 for 12V Battery Backup Systems

The MEAN WELL DRS-240-12 is designed for 12V nominal DC systems and provides a 12V output with up to 20A load current. Maximum battery charging current is 15.4A, and the datasheet recommends a battery capacity range of 20–200Ah.

The Battery Low threshold is below 11 ±0.2V, while battery cut-off is specified at 10.5 ±0.3V. These characteristics make DRS-240-12 suitable for 12V security, access control, alarm and monitoring systems requiring relatively high DC load or battery charging current.

DRS-240-12 is generally selected when the system architecture is based on 12VDC and the required load current is within its 20A output capability.

DRS-240-24 for 24V Battery Backup Systems

The MEAN WELL DRS-240-24 provides a 24V output with up to 10A load current and maximum battery charging current of 7.7A. The recommended battery capacity range is 10–100Ah.

Its Battery Low threshold is below 22 ±0.3V, while battery cut-off is specified at 20.9 ±0.5V.

DRS-240-24 is a practical choice for 24V security systems, access control equipment, industrial monitoring systems and other battery-backed installations using a 24VDC architecture.

DRS-240-36 for 36V Battery Backup Systems

The MEAN WELL DRS-240-36 is intended for 36V nominal DC systems and provides a 36V output with up to 6.6A load current. Maximum battery charging current is 5.1A, with a recommended battery capacity of 6.6–66Ah.

The Battery Low threshold is below 33 ±0.4V, while battery cut-off is specified at 31.3 ±0.7V.

DRS-240-36 should be selected where the connected equipment and battery architecture require a 36VDC power system and the load remains within the available 6.6A output current.

DRS-240-48 for 48V Battery Backup Systems

The MEAN WELL DRS-240-48 provides a 48V output with up to 5A load current and maximum battery charging current of 3.85A. The recommended battery capacity range is 5–50Ah.

Its Battery Low threshold is below 44 ±0.5V, while battery cut-off is specified at 41.8 ±1V.

DRS-240-48 is generally selected for 48V security, monitoring, communication and industrial systems where a higher-voltage DC bus and battery backup architecture are required.

How to Choose Between DRS-240-12, DRS-240-24, DRS-240-36 and DRS-240-48

For most applications, model selection starts with the required DC and battery system voltage. Choose DRS-240-12 for 12V systems, DRS-240-24 for 24V systems, DRS-240-36 for 36V systems and DRS-240-48 for 48V systems.

Then verify the connected load current, required battery charging current and battery capacity. The maximum load currents are 20A, 10A, 6.6A and 5A respectively, while maximum charging currents are 15.4A, 7.7A, 5.1A and 3.85A.

The DRS-240 Series provides up to 240W total combined output power across the load and battery charging channels. The load has priority, so increasing load current automatically reduces the charging current available to the battery when necessary. This should be considered when sizing both the connected load and required battery recharge time.

Choosing MODBus or CANBus Versions

Communication requirements should also be considered during model selection. Standard DRS-240 models include built-in MODBus communication, while DRS-240-xxCAN versions provide CANBus communication.

Both interfaces can be used for charging parameter configuration and system communication. The CANBus versions additionally support charging curve configuration using the optional SBP-001 smart programmer, making them suitable where more advanced charger parameter programming is required.

Alarm Monitoring and Backup System Integration

All DRS-240 models provide AC Fail, DC OK, Battery Low / Abnormal / Disconnected and Charger Fail signals through Form-C relay contacts. The relay contacts support a maximum rating of 30VDC / 1A, allowing security panels, controllers and central monitoring systems to supervise AC input, DC output, battery condition and charger status.

When AC mains power is available, the DRS-240 Series supplies the connected load while charging the battery. If AC mains fails, the DC UPS function switches the load to battery power within 10ms. The battery start function also allows the system to start directly from battery power without AC input.

These functions make the DRS-240 Series particularly suitable for security systems, fire alarm systems, access control, emergency lighting, central monitoring and other installations where both backup power and power-system supervision are required.

Need help choosing the correct DRS-240 model? Start with the required 12V, 24V, 36V or 48V system voltage, then confirm load current, battery capacity, charging current, backup time and whether MODBus or CANBus communication is required.

Related MEAN WELL Security Power Supplies

For security system, battery backup and DIN rail DC UPS design, the following MEAN WELL power supplies can be compared with the DRS-240 Series according to required output power, battery system voltage, charging current, monitoring functions, communication requirements and installation needs:

• DRS-480 Series – Higher-power 480W all-in-one intelligent DIN rail security power supply integrating AC/DC power supply, DC UPS, battery charger, status monitoring and communication functions for applications requiring more output and charging capacity than DRS-240.
• DRC-40 Series – Compact 40W DIN rail AC/DC power supply with integrated battery charger and UPS function for lower-power security, access control, alarm and DC backup applications.
• DRC-60 Series – 60W DIN rail security power supply with battery charger and UPS backup function for applications requiring more output capacity than DRC-40.
• DRC-100 Series – 100W DIN rail power supply with integrated battery charging and backup operation for 12V and 24V security, alarm and monitoring systems.
• DRC-180 Series – 180W DIN rail AC/DC power supply with battery charger and UPS function for higher-load 12V and 24V battery backup systems, providing a simpler alternative where the intelligent communication and extended monitoring functions of DRS-240 are not required.

Need help selecting the right MEAN WELL security power supply?
Compare DRC-40, DRC-60, DRC-100, DRC-180, DRS-240 and DRS-480 based on required power, system voltage, load current, battery charging requirement, DC UPS operation, alarm monitoring, MODBus or CANBus communication, installation space and overall backup system architecture.

Battery Backup and Alarm Monitoring Functions

The MEAN WELL DRS-240 Series integrates AC/DC power conversion, battery charging, DC UPS backup and system status monitoring in a DIN rail design. It is intended for security systems, fire alarm systems, access control, emergency lighting, central monitoring and other applications that require continued DC power and supervised battery backup operation.

When AC mains is available, the DRS-240 Series supplies power to the connected load while charging the external battery. If AC input fails, the built-in DC UPS function switches the load to battery power within 10ms, allowing critical equipment to continue operating without a separate external DC UPS module.

All DRS-240-12, DRS-240-24, DRS-240-36 and DRS-240-48 models provide AC Fail, DC OK, Battery Low / Abnormal / Disconnected and Charger Fail status signals through Form-C relay contacts. The relay contacts support a maximum rating of 30VDC / 1A.

Battery Backup Operation

The DRS-240 Series is designed for direct integration with an external battery. During normal AC operation, the power supply provides energy to the connected load while charging the battery at the same time.

When AC mains power fails, the DC UPS function automatically transfers the load to the connected battery. The transfer occurs within 10ms according to the datasheet, allowing the DRS-240 Series to function as a DIN rail power supply with battery backup for security and monitoring systems that must remain operational during temporary AC power interruption.

The series also supports Battery Start, allowing the system to start directly from battery power without requiring AC input.

Maximum battery charging current is 15.4A for DRS-240-12, 7.7A for DRS-240-24, 5.1A for DRS-240-36 and 3.85A for DRS-240-48.

AC Fail Alarm Signal

The AC Fail relay output allows an external monitoring system to detect loss of AC mains input.

According to the DRS-240 alarm logic, the AC Fail relay provides Form-C contacts and changes state when AC input falls below the specified detection range. The datasheet specifies AC failure detection at approximately 79–89VAC for a 120VAC system and 132–187VAC for a 220VAC system.

The relay contact is rated up to 30VDC / 1A and can be connected to alarm panels, controllers or monitoring equipment for AC mains supervision.

DC OK Status Signal

The DC OK signal provides supervision of the main DC output.

The datasheet states that DC OK is activated when the output voltage is greater than 90% of the rated value. The Form-C relay output is ON when DC output is normal and OFF when a DC failure condition is detected.

This allows external controllers, alarm panels or monitoring systems to verify that the DRS-240 output remains within its normal operating condition.

Battery Low / Abnormal / Disconnected Signal

The Battery Low / Abnormal / Disconnected relay output monitors the condition of the connected backup battery.

Battery Low thresholds vary by model:

• DRS-240-12: below 11 ±0.2V
• DRS-240-24: below 22 ±0.3V
• DRS-240-36: below 33 ±0.4V
• DRS-240-48: below 44 ±0.5V

The relay changes state according to battery condition, allowing security systems, alarm panels and monitoring controllers to detect low, abnormal or disconnected battery conditions before backup capability is lost.

Battery Cut-Off Protection

To help prevent excessive battery discharge during extended backup operation, the DRS-240 Series includes battery cut-off protection.

The specified battery cut-off levels are:

• 10.5 ±0.3V for DRS-240-12
• 20.9 ±0.5V for DRS-240-24
• 31.3 ±0.7V for DRS-240-36
• 41.8 ±1V for DRS-240-48

Battery cut-off works together with battery status monitoring to protect the connected battery during prolonged backup operation.

Charger Fail Alarm Signal

The Charger Fail relay output provides dedicated supervision of the battery charger circuit.

The Form-C contact is ON when the charger is operating normally and OFF when a charger failure is detected, allowing external monitoring equipment to distinguish a charger fault from AC input, DC output or battery-related conditions.

This additional status signal is particularly useful in security and fire alarm installations where battery charging integrity needs to be monitored separately.

Relay Contact Alarm Outputs

The DRS-240 Series provides four Form-C relay monitoring outputs:

• AC Fail
• DC OK
• Battery Low / Abnormal / Disconnected
• Charger Fail

An external voltage source is required for the alarm circuit. The datasheet specifies a maximum applied voltage of 30VDC and a maximum current of 1A.

These relay outputs allow the DRS-240 Series to interface with alarm panels, controllers and central monitoring systems without requiring the monitoring device to rely solely on communication data.

Terminal Assignment and System Connection

The DRS-240 Series provides dedicated terminals for AC input, main DC output, battery connection and system monitoring.

The main system connections include:

• TB1: FG, AC/L and AC/N for AC input
• TB3: +V / -V for the main DC load output
• TB2: BAT. + / BAT. – for the external backup battery
• TB4: AC Fail, Charger Fail, DC OK and Battery Low / Abnormal / Disconnected Form-C relay contacts
• RJ45 communication port for MODBus or CANBus communication depending on model
• CN1 for Battery Start, temperature sensing and related control connections

For correct installation, battery wiring, alarm interface and communication wiring, engineers should follow the terminal assignment and suggested application diagrams provided in the DRS-240 datasheet.

DIN Rail Installation

The DRS-240 Series is designed for installation on TS35/7.5 or TS35/15 DIN rail. Its 85.5 × 125.2 × 129.2 mm enclosure is suitable for integration into security panels, fire alarm enclosures, control cabinets and other industrial electrical installations.

The unit uses free-air convection cooling. For continuous full-power operation, the datasheet recommends approximately 40mm clearance above the unit, 20mm below and 5mm on each side. If an adjacent device is a heat source, 15cm clearance is recommended.

Need wiring and installation details for the DRS-240 Series? Review the connection diagram, terminal assignment and mechanical drawing below, or refer to the official DRS-240 datasheet for complete battery wiring, alarm outputs, communication interface and DIN rail installation information.

Mechanical Dimensions and Installation

The MEAN WELL DRS-240 Series uses a DIN rail enclosure measuring 85.5 × 125.2 × 129.2 mm (W × H × D), designed for installation inside security panels, fire alarm enclosures, access control cabinets, central monitoring systems and other battery-backed power applications.

The series is designed for TS35/7.5 or TS35/15 DIN rail mounting and uses free-air convection cooling without a built-in fan. Its mechanical design integrates AC input, main DC output, external battery connection, four Form-C alarm relay interfaces and MODBus or CANBus communication within a single 240W DIN rail security power supply with battery charger and DC UPS function.

Dimensions

The overall dimensions of the DRS-240 Series are 85.5 mm wide, 125.2 mm high and 129.2 mm deep, with a specified dimensional tolerance of ±1 mm.

All DRS-240-12, DRS-240-24, DRS-240-36 and DRS-240-48 models use the same Case No. 984G enclosure, allowing a common panel layout to be used across 12V, 24V, 36V and 48V system configurations.

The unit weighs approximately 1.19kg and combines the power supply, battery charging circuit, DC UPS control, alarm monitoring and communication interfaces in one DIN rail enclosure.

Terminal Assignment

The DRS-240 Series uses separate terminal blocks for AC input, main DC output, battery connection and Form-C alarm relay signaling.

TB1 AC input terminals:

• Pin 1: FG
• Pin 2: AC/L
• Pin 3: AC/N

TB3 main DC output terminals:

• Pins 1–2: +V
• Pins 3–4: -V

TB2 battery terminals:

• Pins 1–2: BAT. –
• Pins 3–4: BAT. +

TB4 alarm relay terminals:

• Pins 1–3: AC Fail
• Pins 4–6: Charger Fail
• Pins 7–9: DC OK
• Pins 10–12: Battery Low / Abnormal / Disconnected

The unit also provides an RJ45 communication port for MODBus or CANBus communication depending on the selected model, together with additional connections for battery start, battery temperature sensing and related control functions.

These interfaces provide the required connections for AC input, DC load output, external backup battery, alarm supervision and intelligent system communication.

DIN Rail Installation

The DRS-240 Series is designed to fit TS35/7.5 or TS35/15 DIN rail. The DIN rail itself is not included with the power supply.

For continuous full-power operation, the datasheet recommends installation clearances of approximately:

• 40mm above the unit
• 20mm below the unit
• 5mm on the left and right sides

If an adjacent device is a heat source, approximately 15cm clearance is recommended.

Correct installation orientation and adequate cabinet ventilation are important because the DRS-240 Series relies on free-air convection for cooling.

Cooling and Operating Environment

The DRS-240 Series uses free-air convection cooling and does not require an internal fan. The specified operating temperature range is -30°C to +70°C, subject to the derating curve in the datasheet.

The specification lists an operating altitude of 2000 meters. For installation above 2000m, the datasheet provides additional ambient temperature derating guidance of 3.5°C per 1000m for fanless models.

System designers should therefore consider load level, ambient temperature, installation altitude, adjacent heat sources and cabinet ventilation when integrating the DRS-240 Series into enclosed equipment.

Mechanical Drawing and Installation Reference

The DRS-240 mechanical drawing shows the 85.5 × 125.2 × 129.2 mm Case No. 984G enclosure, TB1 AC input terminals, TB2 battery terminals, TB3 DC output terminals, TB4 alarm relay terminals, RJ45 communication port, charging current adjustment, battery start control and rear DIN rail mounting structure.

For final cabinet design and wiring, engineers should refer to the official DRS-240 mechanical drawing and installation instructions to confirm terminal assignment, mounting orientation, wiring arrangement, battery connection, alarm interfaces and communication wiring.

Need application and compliance information for the DRS-240 Series? Continue below to review recommended applications, safety approvals, EMC compliance and intelligent battery backup system guidance.

Applications

The MEAN WELL DRS-240 Series is designed for security, fire alarm, emergency power and industrial backup applications that require a 240W DIN rail AC/DC power supply with integrated battery charger, DC UPS, status monitoring and communication functions.

With wide 90–305VAC input, 12V, 24V, 36V and 48V output options, automatic battery backup during AC mains interruption, Form-C alarm relay outputs, battery protection, MODBus or CANBus communication and DIN rail installation, the DRS-240 Series provides an integrated backup power solution for systems that must remain operational and supervised when AC mains power is temporarily unavailable.

• Security systems requiring regulated DC power, battery charging, backup operation and supervised power status
• Access control systems including controllers, door access panels and related security equipment requiring 12V, 24V, 36V or 48V battery backup
• Fire alarm systems requiring battery-backed DC power, charger supervision and alarm signaling
• Alarm systems requiring continuous DC power, battery backup and AC Fail / Battery Low / Charger Fail / DC OK status monitoring
• Emergency lighting systems requiring battery-supported DC power during AC mains failure
• Public safety battery backup systems requiring integrated power supply, charging, DC UPS and monitoring functions
• DC UPS systems using an external battery to maintain the connected load when AC input is interrupted
• Battery detection and monitoring systems requiring battery condition supervision and controlled backup operation
• Central monitoring systems requiring relay-based power, battery and charger status feedback
• Industrial automation systems requiring DIN rail battery backup, system monitoring and MODBus or CANBus communication

Need certification and compliance details for your project? Continue below to review safety approvals, EMC compliance, alarm design requirements, protection functions and operating environment specifications for the DRS-240 Series.

Certifications and Safety

The MEAN WELL DRS-240 Series is designed for security, fire alarm, emergency lighting, access control, central monitoring, DC UPS and industrial backup applications requiring integrated AC/DC power conversion, battery charging, system supervision and recognized safety and EMC compliance.

According to the official DRS-240 datasheet, the series carries the following safety approvals:

• UL62368-1 for applicable audio/video, information and communication technology equipment safety requirements
• DEKRA BS EN/EN62368-1 for applicable European safety requirements
• RCM AS/NZS 62368.1 for applicable Australia and New Zealand safety requirements
• EAC TP TC 004 for applicable Eurasian safety requirements

The datasheet also specifies compliance to BS EN/EN54-4 for fire detection and fire alarm systems. In addition, the signal and alarm design is stated to meet requirements associated with UL2524, NFPA 1221, BS EN/EN54-4 and GB17945, with configurable parameters available through the communication interface.

The DRS-240 Series is supplied as a component power supply for integration into final equipment. System designers should confirm that the completed equipment continues to meet applicable safety and EMC requirements after installation.

Fire Detection and Alarm System Compliance

The DRS-240 Series is specifically designed with supervised battery backup and alarm functions relevant to fire detection, emergency and security power systems.

The datasheet specifies compliance to BS EN/EN54-4 and provides Form-C relay outputs and LED indication for AC Fail, Battery Low / Abnormal / Disconnected, Charger Fail and DC OK conditions.

The datasheet further states that its signal and alarm design meets requirements associated with UL2524, NFPA 1221, BS EN/EN54-4 and GB17945. These functions support integration into applications where AC input, DC output, battery condition and charger status need to be supervised.

EMC Emission Compliance

For electromagnetic emission requirements, the DRS-240 Series is specified to meet:

• BS EN/EN55032 (CISPR32) Class B for conducted emissions
• BS EN/EN55032 (CISPR32) Class B for radiated emissions
• Applicable harmonic current and voltage flicker requirements specified in the datasheet

Class B conducted and radiated emission performance supports integration into security, monitoring, alarm and other electronic systems where electromagnetic emissions must be controlled.

EMC Immunity Compliance

The DRS-240 Series is specified for EMC immunity according to BS EN/EN55035, BS EN/EN61204-3 and BS EN/EN61000-6-2, with testing including:

• BS EN/EN61000-4-2 electrostatic discharge immunity
• BS EN/EN61000-4-3 radiated RF immunity
• BS EN/EN61000-4-4 electrical fast transient / burst immunity
• BS EN/EN61000-4-5 surge immunity
• BS EN/EN61000-4-6 conducted RF immunity
• BS EN/EN61000-4-8 power-frequency magnetic field immunity

The datasheet specifies individual test levels and performance criteria, including Level 3 ESD, radiated RF, EFT / burst, surge and conducted RF testing, together with Level 4 magnetic field immunity.

Isolation and Electrical Safety

The DRS-240 Series specifies the following withstand voltage levels:

• Input to output: 4KVAC
• Input to FG: 2KVAC
• Output to FG: 1.5KVAC

Isolation resistance is specified at 100MΩ between input-output, input-FG and output-FG under the datasheet test conditions of 500VDC, 25°C and 70% RH.

Protection Functions

Built-in protection functions include short circuit, overload, overvoltage and over-temperature protection, together with battery cut-off and battery reverse polarity protection.

Short-circuit protection operates with constant-current limiting and shuts down the power after approximately 5 seconds, with input power cycling required for recovery. Overload protection also uses constant-current limiting and shuts down the output after approximately 5 seconds.

Overvoltage protection shuts down the output and requires the unit to be re-powered for recovery. Over-temperature protection shuts down the output and automatically recovers after the temperature decreases.

Battery reverse polarity protection is implemented through an internal MOSFET. The datasheet specifies no damage under reverse-polarity conditions, with automatic recovery after the fault is removed.

Operating Altitude and Installation Safety

The DRS-240 Series is specified for operation at 2000 meters and is designed for Overvoltage Category III (OVC III) according to DEKRA BS EN/EN62368-1.

For operation above 2000 meters, the datasheet specifies additional ambient-temperature derating of 3.5°C per 1000 meters for fanless models.

System designers should consider grounding, wiring, installation clearances, ambient temperature, surrounding heat sources and applicable derating requirements when integrating the DRS-240 into final equipment.

Final Equipment Compliance

The DRS-240 Series is considered a component power supply intended for installation inside final equipment. According to the official datasheet, EMC testing was performed with the power supply mounted on a specified metal plate, and the completed equipment must be re-confirmed to ensure that it continues to meet applicable EMC directives after system integration.

System designers should therefore verify grounding, enclosure design, wiring layout, thermal conditions, installation clearances and electromagnetic compatibility in the completed security, fire alarm, emergency lighting, access control, monitoring or battery backup system.

Need more product details before sending an inquiry? Continue below to review model comparison, battery charging and DC UPS operation, alarm signaling, communication functions, mechanical dimensions, installation guidance and application information for the DRS-240 Series.