DDR-120 series

Mean Well DDR-480 480W DIN rail DC-DC converter DDR-480C-24 DDR-480D-48 railway industrial power supply

DDR-480 series

March 20, 2023

MEAN WELL DDR-240 Series 240W DIN rail DC-DC converter for industrial and railway power systems.

MEAN WELL DDR-240 Series 240W DIN Rail DC-DC Converter | DDR-240B-24 / DDR-240C-24 / DDR-240D-24

The MEAN WELL DDR-240 Series is a 240W DIN rail DC-DC converter designed for industrial control systems, railway power applications, factory automation, telecom infrastructure and distributed DC power architectures requiring stable isolated DC voltage conversion.

It supports three 2:1 wide DC input ranges depending on model type: 16.8–33.6Vdc for DDR-240B models, 33.6–67.2Vdc for DDR-240C models, and 67.2–154Vdc for DDR-240D models. Output voltage options include 24Vdc and 48Vdc, making the series suitable for 24V control circuits, 48V DC systems, battery-powered equipment and railway-related DC distribution systems.

The DDR-240 Series features an ultra-slim 40mm width design, fanless cooling by free air convection, high efficiency up to 92.5%, and 150% peak load capability for short-duration high-demand operation. This helps maintain stable power delivery in systems with dynamic startup loads or temporary load surges.

For railway and harsh industrial environments, the series complies with railway-related standards including BS EN/EN50155, BS EN/EN45545-2 and BS EN/EN50121-3-2. It also supports a wide operating temperature range from -40°C to +70°C, with derating required under certain input voltage and thermal conditions.

Built-in protection functions include short circuit, overload, over voltage, over temperature, input reverse polarity and input under-voltage protection. The series also provides 4KVdc I/O reinforced isolation, DC OK relay contact, Remote ON/OFF control, adjustable output voltage and current sharing for scalable power architecture.

With current sharing, up to four units can be connected for parallel operation, supporting system expansion up to 960W under 3+1 configuration. This makes the DDR-240 Series suitable for redundant or higher-power DC bus systems where DIN rail installation, isolation and reliability are required.

The series is commonly searched and specified as DDR-240B-24 DC-DC converter, DDR-240C-24 DIN rail DC-DC converter, DDR-240D-24 railway DC-DC power supply, DDR-240B-48 48V DC-DC converter, and 240W DIN rail DC-DC converter for industrial automation.

Available models include full DDR-240B / C / D series covering:
DDR-240B-24, DDR-240B-48,
DDR-240C-24, DDR-240C-48,
DDR-240D-24, DDR-240D-48.

Key Highlights of DDR-240 Series

MEAN WELL DDR-240 Series 240W DIN rail DC-DC converter designed for industrial control, railway systems, factory automation and distributed DC power architectures
2:1 wide DC input range with DDR-240B models for 16.8–33.6Vdc, DDR-240C models for 33.6–67.2Vdc and DDR-240D models for 67.2–154Vdc systems
High efficiency up to 92.5% with 150% peak load capability for short-duration high-demand operation in industrial power systems
24Vdc and 48Vdc output options for industrial control cabinets, telecom equipment, railway power systems and DC distribution applications
Full model range including DDR-240B-24, DDR-240B-48, DDR-240C-24, DDR-240C-48, DDR-240D-24 and DDR-240D-48 for different input voltage systems
Advanced system functions including DC OK relay contact, Remote ON/OFF control and current sharing up to 960W under 3+1 parallel operation
Industrial protection features including short circuit, overload, over voltage, over temperature, input reverse polarity and input under-voltage protection

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Overview of MEAN WELL DDR-240 Series

The MEAN WELL DDR-240 Series is a 240W DIN rail type DC-DC converter platform designed for industrial control systems, railway power applications, factory automation, telecom infrastructure and distributed DC power architectures requiring stable isolated DC voltage conversion. It combines compact DIN rail mounting, reinforced isolation design and fanless convection cooling for reliable operation in space-limited control cabinets.

The series supports three 2:1 wide input voltage platforms including DDR-240B (16.8–33.6Vdc), DDR-240C (33.6–67.2Vdc) and DDR-240D (67.2–154Vdc), with regulated DC output options of 24V and 48V. This makes it suitable for 24V industrial control circuits, 48V communication equipment, battery-powered DC systems and 110V railway-related DC distribution applications.

As part of MEAN WELL’s industrial DIN rail DC-DC converter family, the DDR-240 Series is widely used in bus, tram, metro and railway systems, industrial control equipment, semiconductor fabrication equipment, factory automation, electro-mechanical systems, wireless networks, telecom systems and datacom infrastructure. It is commonly specified in procurement as DDR-240B-24 DC-DC converter, DDR-240C-24 DIN rail DC-DC converter, DDR-240D-24 railway DC-DC power supply, DDR-240B-48 48V DC-DC converter and 240W industrial DIN rail power converter.

The series features high efficiency up to 92.5%, ultra-slim 40mm width design and supports 150% peak load capability for short-duration high-demand operation. It also integrates full protection functions including short circuit, overload, over voltage, over temperature, input reverse polarity and input under-voltage protection, helping maintain stable operation in harsh industrial environments from -40°C to +70°C.

For railway and demanding industrial environments, the DDR-240 Series complies with railway-related standards including BS EN/EN50155, BS EN/EN45545-2 and BS EN/EN50121-3-2. It also provides 4KVdc I/O reinforced isolation, DC OK relay contact and Remote ON/OFF control for system monitoring and intelligent power management.

For system-level scalability, the DDR-240 Series supports current sharing up to 960W under 3+1 parallel operation, enabling expandable DC power architectures for applications requiring higher total output power or redundant system design. Available models include DDR-240B / DDR-240C / DDR-240D series covering 24V and 48V DC outputs: DDR-240B-24, DDR-240B-48, DDR-240C-24, DDR-240C-48, DDR-240D-24 and DDR-240D-48.

Features of MEAN WELL DDR-240 Series

240W DIN rail DC-DC converter platform designed for industrial control, railway systems, factory automation and distributed DC power architectures
Three 2:1 wide input voltage types: DDR-240B (16.8–33.6Vdc), DDR-240C (33.6–67.2Vdc), DDR-240D (67.2–154Vdc) for flexible DC system integration
Compact ultra-slim 40mm width DIN rail design for high-density control cabinet installation
High efficiency up to 92.5% for stable and energy-efficient DC power conversion
150% peak load capability for short-duration high transient load conditions in industrial systems
Available models include DDR-240B / DDR-240C / DDR-240D series covering 24V and 48V DC outputs
Full model range: DDR-240B-24, DDR-240B-48, DDR-240C-24, DDR-240C-48, DDR-240D-24 and DDR-240D-48
Current sharing capability up to 960W under 3+1 parallel operation for scalable or redundant DC power systems
Built-in DC OK relay contact for real-time power status monitoring and system fault indication
Remote ON/OFF control for system-level power management and intelligent equipment integration
Input reverse polarity protection with MOSFET-based design for safer DC input connection
Short circuit, overload, over voltage, over temperature and input under-voltage protection for system reliability
Wide operating temperature range from -40℃ to +70℃ for harsh industrial and railway-related environments
Reinforced 4KVdc I/O isolation for industrial safety, system separation and noise-resistant DC power design
Railway-related compliance including BS EN/EN50155, BS EN/EN45545-2 and BS EN/EN50121-3-2
Suitable for bus, tram, metro, railway systems, industrial automation, semiconductor equipment, telecom, datacom and wireless network applications
3-year manufacturer warranty

Need help selecting the right model? Compare DDR-240B vs DDR-240C vs DDR-240D based on input voltage, output voltage and application requirements.

DDR-240 Series Technical Specifications

The table below compares the main electrical specifications of the MEAN WELL DDR-240 Series, including input type, output voltage, rated current, current range, rated power, peak load capability, ripple and noise, voltage adjustment range and typical efficiency across DDR-240B / DDR-240C / DDR-240D models with 24V / 48V output options.

It helps engineers quickly compare different DC input architectures and output voltages, and select the right 240W DIN rail DC-DC converter for industrial control systems, railway power applications, factory automation, telecom infrastructure, datacom equipment and distributed DC power systems.

Model	Input Type	Output Voltage	Rated Current	Current Range	Rated Power	Peak Load	Ripple & Noise Max.	Voltage Adj. Range	Efficiency Typ.
DDR-240B-24	16.8–33.6Vdc	24V	10A	0–10A	240W	360W (3s)	80mVp-p	24–28V	90%
DDR-240B-48	16.8–33.6Vdc	48V	5A	0–5A	240W	360W (3s)	100mVp-p	48–56V	90%
DDR-240C-24	33.6–67.2Vdc	24V	10A	0–10A	240W	360W (3s)	80mVp-p	24–28V	91%
DDR-240C-48	33.6–67.2Vdc	48V	5A	0–5A	240W	360W (3s)	100mVp-p	48–56V	92%
DDR-240D-24	67.2–154Vdc	24V	10A	0–10A	240W	360W (3s)	80mVp-p	24–28V	92%
DDR-240D-48	67.2–154Vdc	48V	5A	0–5A	240W	360W (3s)	100mVp-p	48–56V	92.5%

Common input specifications: DDR-240B / DDR-240C / DDR-240D support three 2:1 wide DC input ranges: 16.8–33.6Vdc, 33.6–67.2Vdc and 67.2–154Vdc for 24V, 48V and 110V DC bus systems.

Output and system performance: The DDR-240 Series provides 24V and 48V output models with 240W rated power and 150% peak load capability up to 360W for 3 seconds, depending on operating conditions.

Protection and control features: Built-in protection includes short circuit, overload, over voltage, over temperature, input reverse polarity and input under-voltage protection. The series also provides DC OK relay contact and Remote ON/OFF control.

System expansion note: Supports current sharing up to 960W under 3+1 parallel operation, enabling scalable or redundant DC power architectures for industrial and railway applications.

Need more technical details? Continue below for installation dimensions, wiring diagrams, derating curves, hold-up time, efficiency curves, protection characteristics and application guidelines for DDR-240B / DDR-240C / DDR-240D series DC-DC converters.

Model Selection Guide for DDR-240 Series

The MEAN WELL DDR-240 Series offers a focused range of 240W DIN rail DC-DC converter models designed for industrial control systems, railway power applications, factory automation, telecom infrastructure and distributed DC power architectures. It allows engineers, OEM buyers and system integrators to select the most suitable model based on input voltage type, output voltage requirement, load current demand, peak-load conditions, system redundancy needs and application environment.

Each model shares the same industrial-grade DIN rail structure, ultra-slim 40mm width design, high efficiency performance up to 92.5%, reinforced 4KVdc I/O isolation, fanless convection cooling and full protection functions, while providing different input voltage ranges and 24V / 48V output configurations for flexible DC system integration in control cabinets, railway-related systems, telecom infrastructure, datacom equipment and industrial DC distribution applications.

16.8–33.6V DC Input Systems (DDR-240B Series)

The DDR-240B series is designed for low-voltage DC bus systems, battery-backed systems and 24V industrial control architectures requiring stable isolated DC-DC conversion.

Common search terms include DDR-240B-24 DC-DC converter, DDR-240B-48 48V DC-DC converter, 24V DIN rail DC-DC converter 240W and industrial 24V DC power converter.

This series includes DDR-240B-24 and DDR-240B-48 models, supporting 24V and 48V output selection for control systems, automation equipment, battery-powered equipment and distributed DC loads.

33.6–67.2V DC Input Systems (DDR-240C Series)

The DDR-240C series is optimized for 48V DC industrial bus systems, telecom infrastructure, communication equipment and distributed DC power networks requiring efficient isolated power conversion.

Search demand commonly includes DDR-240C-24 DIN rail converter, DDR-240C-48 DC-DC converter, 48V DC-DC power supply 240W and DIN rail DC-DC converter for telecom systems.

This series includes DDR-240C-24 and DDR-240C-48 models, widely used in telecom, datacom, automation and DC distribution networks.

67.2–154V DC Input Systems (DDR-240D Series)

The DDR-240D series is designed for high-voltage DC input environments, including 110V DC bus systems, railway-related power systems and industrial applications requiring wide input compatibility and reinforced isolation.

Common search queries include DDR-240D-24 railway DC-DC converter, DDR-240D-48 railway DC-DC power supply, 110V DC-DC power supply DIN rail and industrial railway power converter 240W.

This series includes DDR-240D-24 and DDR-240D-48 models for high-voltage DC system integration in railway, industrial control, telecom and distributed power applications.

System Design & Application Matching

The DDR-240 Series supports a wide range of DC system architectures, including 24V control systems, 48V telecom systems and 110V railway-related DC power systems. Engineers typically select models based on input bus voltage, required output voltage, rated current, peak-load requirement, operating temperature, isolation level, DIN rail cabinet space and system monitoring requirements.

Need help selecting the correct DDR-240 model? Match your input voltage system (B/C/D type), required output voltage (24V/48V), installation environment and application type (industrial, telecom, datacom or railway) to select the most suitable 240W DIN rail DC-DC converter for your project.

Related MEAN WELL DIN Rail DC-DC Converter Series

For system design comparison and DC power architecture planning, the following MEAN WELL DIN rail DC-DC converter series are commonly used across different power levels in industrial control, factory automation, railway-related systems, telecom equipment, control cabinets and distributed DC power applications:

DDR-15 Series – Ultra-compact low-power DIN rail DC-DC converter for basic control circuits, sensors, signal devices and embedded electronic systems.
DDR-30 Series – Low-power DIN rail DC-DC converter for industrial control systems, compact equipment and small DC loads requiring stable voltage conversion.
DDR-60 Series – Compact 60W DIN rail DC-DC converter for automation systems, control panels and distributed low-power DC applications.
DDR-120 Series – 120W DIN rail DC-DC converter for industrial control cabinets, communication systems, railway subsystems and medium-load DC applications.
DDR-240 Series – Current series: 240W DIN rail DC-DC converter with 24V / 48V output models, 2:1 wide DC input range, 40mm slim width, 150% peak load capability and current sharing up to 960W.
DDR-480 Series – 480W DIN rail DC-DC converter platform for industrial automation, railway systems, telecom infrastructure and high-power distributed DC power applications.

Need help selecting the right MEAN WELL DDR series converter?
Compare DDR-15, DDR-30, DDR-60, DDR-120, DDR-240 and DDR-480 based on input bus voltage, output voltage, rated power, peak-load requirement, installation space, isolation level, efficiency target and application environment.

Adjustable Output Voltage, Remote ON/OFF, DC OK Relay and Parallel Operation

The MEAN WELL DDR-240 Series provides integrated system-level control functions including adjustable DC output voltage, DC OK relay contact, Remote ON/OFF control and current sharing capability for industrial control systems, railway power applications, factory automation, telecom infrastructure and distributed DC power architectures.

For DDR-240B, DDR-240C and DDR-240D models, the series supports input-type-dependent DC conversion with stable regulated output options of 24V and 48V. This enables flexible adaptation to 24V industrial control circuits, 48V communication systems, battery-powered DC equipment and 110V railway-related DC bus applications.

The Remote ON/OFF control function allows external switching of the DC-DC converter through control terminals, enabling system-level power sequencing, standby control, centralized automation logic and PLC-based power management integration.

The adjustable output voltage, DC OK relay contact and current sharing functions further support stable voltage matching, real-time power status feedback and scalable DC system expansion for applications requiring reliable isolated DIN rail DC power conversion.

Adjustable Output Voltage

The DDR-240 Series provides regulated DC output across all models, with adjustable output voltage ranges depending on model selection. The 24V output models can be adjusted from 24V to 28V, while the 48V output models can be adjusted from 48V to 56V.

This allows engineers to fine-tune the DC output according to system voltage requirements, cable voltage drop allowance, connected load characteristics and control cabinet design needs.

The series supports 24V and 48V output configurations, helping users match common industrial control, telecom, datacom and railway-related DC system architectures.

Remote ON/OFF Control

The Remote ON/OFF function enables external control of the DDR-240 Series through dedicated control terminals. The power supply can be switched ON or OFF by applying the appropriate control signal, allowing integration with PLCs, industrial controllers and system-level power sequencing logic.

According to the function configuration, the power supply is ON when the Remote ON/OFF terminals are open or supplied with 4–10Vdc, and OFF when the terminals are shorted or supplied with 0–0.8Vdc.

This function is useful in automated systems requiring controlled startup, shutdown sequencing, standby operation and centralized power management.

DC OK Relay Contact

The DDR-240 Series provides a DC OK relay contact for output status monitoring. The relay contact closes when the power supply turns on and DC output is normal, and opens when the power supply turns off or DC output fails.

The DC OK relay contact supports up to 30Vdc / 1A resistive load, making it suitable for power status feedback, alarm circuits, PLC monitoring and supervisory control systems.

This feature improves system diagnostic capability in industrial automation, telecom, datacom and railway-related DC power applications.

Parallel Operation and Current Sharing

The DDR-240 Series supports current sharing for parallel operation, enabling scalable DC power expansion up to 960W under 3+1 configuration.

Up to four units can be connected in parallel by linking the current sharing terminals. The total output current should be calculated based on the rated current per unit, the number of units and the required derating factor for parallel operation.

For stable current sharing, the voltage difference between each output should be minimized, and the minimum output load should be greater than 3% of the total rated output load. Proper wiring, terminal connection and system-level design are required to ensure balanced current distribution between units.

Need installation and system integration details for the DDR-240 Series? Continue below for mechanical specifications, terminal assignments, wiring diagrams, protection functions, derating curves, hold-up time, efficiency curves, application guidance and system-level design considerations for DDR-240B / DDR-240C / DDR-240D configurations.

MEAN WELL DDR-240 Series mechanical drawing and terminal layout — Mechanical dimensions and terminal assignment for the MEAN WELL DDR-240 Series 240W DIN rail DC-DC converter.

Mechanical Dimensions and Installation

The MEAN WELL DDR-240 Series features a compact 240W DIN rail DC-DC converter design with an ultra-slim 40mm width housing optimized for industrial control cabinets, railway-related systems, factory automation, telecom equipment and distributed DC power architectures. Its DIN rail TS35/7.5 or TS35/15 mounting structure, reinforced 4KVdc I/O isolation, fanless convection cooling and high efficiency up to 92.5% make it suitable for reliable isolated DC power conversion in space-limited industrial environments.

Dimensions

The overall mechanical size of the DDR-240 Series is 40 × 125.2 × 113.5 mm. This slim DIN rail form factor supports 240W DC-DC conversion with three input voltage platforms: DDR-240B, DDR-240C and DDR-240D, providing flexible integration for 24V, 48V and 110V DC bus systems.

Compared with lower power DIN rail DC-DC converters, the DDR-240 Series is designed for applications requiring higher power density, wide 2:1 input flexibility, reinforced isolation and system-level control functions in compact industrial control cabinets and railway-related DC power systems.

Terminal Assignment

The DDR-240 Series includes DC input terminals (+Vin / -Vin), DC output terminals (+Vo / -Vo), grounding terminal (FG), current sharing terminals (P+ / P-), DC OK relay contact and Remote ON/OFF control interface for system integration.

The terminal structure supports:
– DC input connection for B/C/D type input ranges
– DC output connection for 24V / 48V regulated output
– Parallel operation via P+ / P- current sharing terminals
– DC OK relay contact for system monitoring
– Remote ON/OFF control for external switching
– FG connection for grounding and system safety

This terminal design enables integration into industrial automation systems, railway-related DC bus systems, telecom equipment, datacom infrastructure and distributed DC power architectures requiring monitoring and control capability.

Installation Notes

When installing the DDR-240 Series into industrial equipment, control cabinets or railway-related systems, users should ensure correct DIN rail mounting, wiring clearance, grounding method, airflow direction and temperature derating conditions according to the official datasheet and installation manual.

Because the DDR-240 Series uses free air convection cooling, sufficient ventilation space should be maintained to ensure stable long-term operation under continuous load conditions. Signal and power wiring should be routed carefully to reduce electromagnetic interference and maintain stable DC output and control signal integrity.

Mounting and Accessory Notes

The DDR-240 Series is designed for TS35/7.5 or TS35/15 DIN rail mounting with secure mechanical installation for industrial environments. Proper mounting helps maintain mechanical stability under vibration and long-term operation in automation, telecom and railway-related systems.

The product is designed for DIN rail installation, but the DIN rail itself is for reference only and is not included with the unit. For detailed installation requirements, users should refer to the official MEAN WELL installation manual.

Parallel Installation Considerations

For systems using multiple DDR-240 units in parallel, current sharing terminals (P+ / P-) must be connected correctly to support balanced load distribution. Wiring should be short, low impedance and properly sized to reduce voltage drop and improve current sharing stability.

Parallel operation supports up to four units and enables scalable DC power systems up to 960W under 3+1 configuration. This is useful for industrial automation cabinets, railway-related DC power systems, telecom infrastructure and distributed DC architectures requiring redundancy or increased output capacity.

Need application and system integration details for the DDR-240 Series? Continue below to explore recommended applications, railway-related standards, EMC compliance, wiring diagrams, protection functions and system-level design guidelines for DDR-240B / DDR-240C / DDR-240D configurations.

Applications of DDR-240 Series

The MEAN WELL DDR-240 Series is suitable for a wide range of industrial, railway-related and DC power system applications requiring a 240W DIN rail DC-DC converter with 2:1 wide input flexibility, reinforced isolation and stable 24V / 48V DC output for system-level power distribution.

With high efficiency operation, 40mm ultra-slim DIN rail design, current sharing capability up to 960W under 3+1 parallel operation, Remote ON/OFF control, DC OK relay contact and input reverse polarity protection, the DDR-240 Series is designed for applications requiring stable isolated DC conversion, scalable power architecture and long-term operational reliability in industrial environments.

Industrial control systems and automation machinery requiring stable 24V / 48V DC power conversion
Bus, tram, metro and railway-related DC power architectures requiring EN50155-related reliability
Telecom, datacom and wireless network equipment requiring efficient distributed DC power conversion
Semiconductor fabrication equipment, factory automation equipment and embedded industrial electronic systems
DC distribution systems requiring conversion from 24V, 48V or 110V DC bus architectures
Scalable DC power systems using current sharing and parallel operation for increased system capacity
High-reliability industrial environments requiring short circuit, overload, over voltage, over temperature and input protection
Battery-buffered DC systems and distributed power architectures requiring isolated DIN rail DC-DC conversion
Industrial machinery and electrical equipment requiring compact 40mm DIN rail power integration
General DC power supply replacement applications in OEM industrial equipment and control cabinets

Need certification and compliance details for your project? Continue below to review safety standards, EMC information, railway-related compliance, insulation ratings and system-level installation requirements for the DDR-240 Series.

Certifications and Safety

The MEAN WELL DDR-240 Series is designed for industrial, railway-related and DC power distribution applications requiring international safety compliance, reinforced isolation and reliable isolated DC-DC conversion performance in harsh operating environments. It is suitable for industrial control systems, railway-related DC power architectures, telecom infrastructure, datacom equipment, factory control cabinets and distributed DC bus systems requiring stable DIN rail mounted power conversion.

According to the official DDR-240 Series datasheet, the series complies with multiple international safety and railway-related standards for industrial control and DC-DC power conversion equipment:

IEC62368-1 approved for industrial and ICT equipment safety requirements
UL62368-1 approved for North American safety compliance
AS/NZS62368.1 approved for Australia and New Zealand safety compliance
EAC TP TC 004 approved for Eurasian market compliance
BS EN/EN50155 and IEC60571 railway-related compliance for electronic equipment used on rolling stock
BS EN/EN45545-2 fire protection compliance for railway applications
IEC61373 compliance for shock and vibration requirements in railway-related environments
BS EN/EN50121-3-2 compliance for railway EMC requirements

The DDR-240 Series is designed with 4KVdc I/O reinforced isolation, supporting stable electrical separation between input and output circuits in industrial DC-DC conversion systems, railway-related DC bus systems and distributed power architectures.

EMC performance is designed for industrial and railway-related environments, including immunity to electrostatic discharge, radiated disturbance, EFT/burst, surge, conducted disturbance and magnetic field interference according to relevant BS EN/EN61000-4 series test requirements. The series also meets Class B conducted and radiated emission requirements under BS EN/EN55032.

For system-level safety, the DDR-240 Series includes short circuit, overload, over voltage, over temperature, input reverse polarity and input under-voltage protection functions, helping maintain reliable operation under abnormal electrical or environmental conditions.

As with all industrial DIN rail power devices, final EMC and safety compliance must be verified at system level. Designers should ensure correct grounding, shielding, enclosure design, wiring separation, thermal management, operating altitude derating and insulation coordination based on the final application environment.

Need more product details before system integration? Continue below to review application guidance, model selection for DDR-240B / DDR-240C / DDR-240D, wiring diagrams, mechanical installation, parallel operation, derating curves, hold-up time and DC system design considerations.

FAQ

What is the MEAN WELL DDR-240 Series used for?

The MEAN WELL DDR-240 Series is a 240W DIN rail DC-DC converter used for industrial control systems, factory automation, telecom equipment, datacom systems, wireless networks, railway-related DC power systems and distributed DC power architectures. It is mainly selected when a system needs stable isolated DC voltage conversion from 24V, 48V or 110V DC bus input to regulated 24V or 48V output.

What input voltage range does the DDR-240 Series support?

The DDR-240 Series has three input voltage types. DDR-240B models support 16.8–33.6Vdc input, DDR-240C models support 33.6–67.2Vdc input, and DDR-240D models support 67.2–154Vdc input. This allows engineers to choose the correct model for 24V, 48V or 110V DC bus systems.

What is the difference between DDR-240B, DDR-240C and DDR-240D?

The main difference is the input voltage range. DDR-240B is for 24V-class DC input systems, DDR-240C is for 48V-class DC input systems, and DDR-240D is for 110V-class DC input systems. Output options are 24V and 48V, so model selection should be based first on input bus voltage and then on required output voltage.

Which DDR-240 models are available?

The DDR-240 Series includes six models: DDR-240B-24, DDR-240B-48, DDR-240C-24, DDR-240C-48, DDR-240D-24 and DDR-240D-48. The “B / C / D” part indicates the input voltage type, while “24” or “48” indicates the output voltage.

Is DDR-240 suitable for railway applications?

Yes. The DDR-240 Series is designed with railway-related compliance, including BS EN/EN50155, IEC60571, IEC61373 shock and vibration compliance, BS EN/EN50121-3-2 EMC compliance and BS EN/EN45545-2 fire protection compliance. It is suitable for railway-related DC power architectures, but the final system still needs to be verified according to the complete application environment.

Does DDR-240 support parallel operation?

Yes. The DDR-240 Series supports current sharing for parallel operation. Up to four units can be used in parallel, supporting system expansion up to 960W under 3+1 configuration. For reliable current sharing, output voltage difference between units should be minimized and wiring should follow the official installation guidance.

What is the peak load capability of DDR-240?

The DDR-240 Series supports 150% peak load capability. For a 240W rated output, the peak load can reach 360W for up to 3 seconds, depending on operating conditions. This is useful for systems with temporary startup surge or short-duration transient load demand.

Does DDR-240 have Remote ON/OFF control?

Yes. DDR-240 supports Remote ON/OFF control through dedicated control terminals. The converter is ON when the Remote ON/OFF terminals are open or supplied with 4–10Vdc, and OFF when the terminals are shorted or supplied with 0–0.8Vdc. This is useful for PLC control, standby operation, power sequencing and centralized system power management.

Does DDR-240 provide DC OK signal output?

Yes. The DDR-240 Series provides a DC OK relay contact for power status monitoring. The relay contact closes when the power supply is operating normally and opens when the output fails or the unit turns off. The contact rating is up to 30Vdc / 1A resistive load, making it suitable for PLC monitoring, alarm circuits and supervisory control systems.

How do I choose the correct DDR-240 model?

First confirm your input bus voltage. Choose DDR-240B for 24V-class input, DDR-240C for 48V-class input, and DDR-240D for 110V-class input. Then choose the output voltage: 24V output models for industrial control circuits and 48V output models for telecom, datacom or 48V DC distribution systems. Also check rated current, peak load, operating temperature, DIN rail space, isolation requirement and whether current sharing or Remote ON/OFF control is needed.

Need more details about DDR-240 Series input voltage range (DDR-240B / DDR-240C / DDR-240D), current sharing parallel operation, DC OK relay contact, Remote ON/OFF control, adjustable output voltage and system-level DC-DC converter integration? Check the FAQ section above or review the datasheet for complete electrical, mechanical and system interface specifications for industrial control, railway-related systems, telecom, datacom and DC power distribution applications.

Product Video

Mean Well DC-DC DIN Rail Power Supply DDR-240 Series Unboxing

Mean Well DC-DC DIN Rail Power Supply DDR-240 Series Video Show

DDR-240 Series product videos will be added soon.

Need more details about DDR-240 Series input voltage range (DDR-240B / DDR-240C / DDR-240D), DC-DC converter application support, current sharing parallel operation, Remote ON/OFF control, DC OK relay contact and system-level DIN rail power integration? Check the FAQs above or review the datasheet for complete electrical, mechanical and system interface specifications for industrial control, railway-related systems, telecom, datacom and DC power distribution applications.