MEAN WELL DDR Series DIN Rail DC-DC Converters

Installation Manual

Introduction

The MEAN WELL DDR series comprises DIN rail-type DC-DC converters featuring easy DIN rail installation, ultra-slim width, 2:1 wide input voltage range, fanless design, and a wide operating temperature range (-40~+70°C, or -40~+80°C for DDR-480 series). They offer 4kVdc I/O isolation, 150% peak load capability, current sharing, DC OK signal, adjustable output voltage, and comprehensive protective functions.

This series supports various input voltage options: 9~18V, 16.8~33.6V, 33.6~67.2V, and 67.2~154V, with output options of 12V, 24V, and 48V. They are suitable for applications in industrial and railway control, security systems, communication systems, and other fields, including DC buck/boost regulation, increasing system insulation levels, and voltage drop compensation along cables.

Specifications

The DDR series includes models DDR-120, DDR-240, and DDR-480, each available with different input and output voltage/current ratings.

Model	Input Voltage Range	Input Current (Max)	Output Voltage	Output Current (Max)
DDR-120A-12	9~18VDC	13.5A	12V	7.1A (9~10.8Vin) 8.3A (10.8~18Vin)
DDR-120A-24	9~18VDC	13.5A	24V	3.6A (9~10.8Vin) 4.2A (10.8~18Vin)
DDR-120A-48	9~18VDC	13.5A	48V	1.8A (9~10.8Vin) 2.1A (10.8~18Vin)
DDR-120B-12	16.8~33.6VDC	9A	12V	9A (16.8~21.6Vin) 10A (21.6~33.6Vin)
DDR-120B-24	16.8~33.6VDC	9A	24V	4.5A (16.8~21.6Vin) 5A (21.6~33.6Vin)
DDR-120B-48	16.8~33.6VDC	9A	48V	2.3A (16.8~21.6Vin) 2.5A (21.6~33.6Vin)
DDR-120C-12	33.6~67.2VDC	4.5A	12V	9A (33.6~43.2Vin) 10A (43.2~67.2Vin)
DDR-120C-24	33.6~67.2VDC	4.5A	24V	4.5A (33.6~43.2Vin) 5A (43.2~67.2Vin)
DDR-120C-48	33.6~67.2VDC	4.5A	48V	2.3A (33.6~43.2Vin) 2.5A (43.2~67.2Vin)
DDR-120D-12	67.2~154VDC	2.5A	12V	9A (67.2~86.4Vin) 10A (86.4~154Vin)
DDR-120D-24	67.2~154VDC	2.5A	24V	4.5A (67.2~86.4Vin) 5A (86.4~154Vin)
DDR-120D-48	67.2~154VDC	2.5A	48V	2.3A (67.2~86.4Vin) 2.5A (86.4~154Vin)
DDR-240B-24	16.8~33.6VDC	13.5A	24V	8A (16.8~21.6Vin) 10A (21.6~33.6Vin)
DDR-240B-48	16.8~33.6VDC	13.5A	48V	4A (16.8~21.6Vin) 5A (21.6~33.6Vin)
DDR-240C-24	33.6~67.2VDC	7.5A	24V	9A (33.6~43.2Vin) 10A (43.2~67.2Vin)
DDR-240C-48	33.6~67.2VDC	7.5A	48V	4.5A (33.6~43.2Vin) 5A (43.2~67.2Vin)
DDR-240D-24	67.2~154VDC	3.7A	24V	9A (67.2~86.4Vin) 10A (86.4~154Vin)
DDR-240D-48	67.2~154VDC	3.7A	48V	4.5A (67.2~86.4Vin) 5A (86.4~154Vin)
DDR-480B-12	16.8~33.6VDC	23A	12V	26.7A (16.8~21.6Vin) 33.4A (21.6~33.6Vin)
DDR-480B-24	16.8~33.6VDC	23A	24V	16A (16.8~21.6Vin) 20A (21.6~33.6Vin)
DDR-480B-48	16.8~33.6VDC	23A	48V	8A (16.8~21.6Vin) 10A (21.6~33.6Vin)
DDR-480C-12	33.6~67.2VDC	11.2A	12V	30A (33.6~43.2Vin) 33.4A (43.2~67.2Vin)
DDR-480C-24	33.6~67.2VDC	11.2A	24V	18A (33.6~43.2Vin) 20A (43.2~67.2Vin)
DDR-480C-48	33.6~67.2VDC	11.2A	48V	9A (33.6~43.2Vin) 10A (43.2~67.2Vin)
DDR-480D-12	67.2~154VDC	5A	12V	30A (67.2~86.4Vin) 33.4A (86.4~154Vin)
DDR-480D-24	67.2~154VDC	5A	24V	18A (67.2~86.4Vin) 20A (86.4~154Vin)
DDR-480D-48	67.2~154VDC	5A	48V	9A (67.2~86.4Vin) 10A (86.4~154Vin)

Installation

General Guidelines

Always allow adequate ventilation clearances: 5mm on the left and right, 40mm above, and 20mm below the unit during operation to prevent overheating.

Mounting Orientation

The recommended mounting orientation is vertical, with input terminals at the bottom and output terminals at the top. Mounting orientations such as upside down, horizontal, or table-top mounting are not permitted.

Wiring and Connections

Use copper wire only. Recommended wire gauges and their corresponding current ratings are as follows:

AWG	18	16	14	12	10
Rated Current of Equipment (Amp)	7A	10A	15A	20A	30A
Cross-section of Lead (mm²)	0.8	1.3	2.1	3.3	5.3

Notes:

The current capacity for each wire should be de-rated to 80% of the suggested value when using 5 or more wires connected to the unit.
The maximum allowable wire cross-sectional area for the terminal is 12AWG/2.5 mm².

Ensure that all strands of each stranded wire are fully inserted into the terminal connection and that the screw terminals are securely tightened to prevent poor contact. If the power supply has multiple output terminals, ensure each contact is connected to wires to prevent excessive current stress on a single contact.

Use wires rated for at least 80°C, such as UL1007.

Recommended wire strapping length is 5mm (0.197 inches).

Recommended screwdriver is a 4mm slotted type.

Terminal Torque Settings

The recommended torque settings for the terminals are:

Model	Input (I/P) Torque	Output (O/P) Torque
DDR-120	6.9 kgf-cm (6 Lb-in)	6.9 kgf-cm (6 Lb-in)
DDR-240	8.06 kgf-cm (7 Lb-in)	5.13 kgf-cm (4.45 Lb-in)
DDR-480	10.3 kgf-cm (9 Lb-in)	8.06 kgf-cm (7 Lb-in)

Suggested Fuse

The following fuses are suggested for the respective models:

Model	Fuse
DDR-120A	T10A/L250V x2
DDR-120B	T8A/L250V x2
DDR-120C	T8A/L250V x1
DDR-120D	T4A/L250V x1
DDR-240B	T10A/L250V x2
DDR-240C	T6.3A/L250V x2
DDR-240D	T6.3A/L250V x1
DDR-480B	T10A/L250V*5
DDR-480C	T8A/L250V*3
DDR-480D	T6.3A/L250V*3

Mounting Instructions

Mount the unit as shown in the figures, with input terminals facing downwards, to ensure adequate cooling. If mounted in other orientations, sufficient cooling may not be possible.

Admissible DIN rail type: TS35/7.5 or TS35/15.

For rail fastening:

Tilt the unit slightly rearwards.
Fit the unit over the top hat rail.
Slide it downward until it hits the stop.
Press against the bottom for locking.
Shake the unit slightly to confirm the locking action.

Warnings and Cautions

Please observe the following safety precautions:

Risk of electrical shock and energy hazard: All failures should be examined by a qualified technician. Do not attempt to remove the power supply case yourself.
Risk of electric arcs and electric shock (danger to life): Connecting both the primary and secondary sides together is not allowed.
Risk of burn hazard: Do not touch the unit during operation or immediately after disconnection.
Risk of fire and short circuit: Ensure openings are protected from foreign objects and dripping liquids.
Install the unit only in a pollution degree 2 environment (Note 1).
Do not install the unit in places with high moisture or near water.
The maximum operating temperatures are 55°C for DDR-120 series, 50°C for DDR-240 series, and 60°C for DDR-480 series. Avoid installing the unit in places with high ambient temperatures or near fire sources.
The FG (Protective Earth) terminal must be connected to PE (Protective Earth).
Output current and output wattage must not exceed the rated values specified.
Disconnect system from supply voltage: Before commencing any installation, maintenance, or modification work, disconnect the system from the supply voltage. Ensure that inadvertent reconnection into the circuit is impossible.
For continued protection against fire risk, replace fuses only with the same type and rating. (To avoid compromising fire protection, replace with a fuse of the same type and nominal characteristics.)

Note 1: Pollution Degree 2 applies to environments where only non-conductive pollution is present, which might temporarily become conductive due to occasional condensation. Generally, this refers to dry, well-ventilated locations such as control cabinets.

Manufacturer and Contact Information

Manufacturer

MEAN WELL ENTERPRISES CO., LTD.
No.28, Wuquan 3rd Rd., Wugu Dist., New Taipei City 24891, Taiwan
Tel: +886-2-2299-6100
Web: www.meanwell.com

Branch Offices

China: MEAN WELL (GUANGZHOU) ENTERPRISES Co., LTD.
2F, A Building, Yuean Industry Park, Huangcun, Dongpu Yown, Tianhe District, Guangzhou, China
Post Code: 510660
Tel: +86-20-2887-1200
Web: www.meanwell.com.cn
China: MEAN WELL (GUANGZHOU) ENTERPRISES Co., LTD.
No.11, Jingu South Road, Huadong Town, Huadu Distric, Guangzhou, China
Tel: +86-20-3773-7100
Web: www.meanwell.com.cn
China: SUZHOU MEAN WELL TECHNOLOGY Co., LTD.
No.77, Jian-Ming Rd. Dong-Qiao, Pan-Yang Ind. Park, Huang-Dai Town, Xiang-Cheng District, Suzhou, Jiang-Su, China
Post Code: 215152
Tel: +86-512-6508-8600
Web: www.meanwell.cc
U.S.A.: MEAN WELL USA, INC.
44030 Fremont Blvd., Fremont, CA 94538, U.S.A.
Tel: +1-510-683-8886
Web: www.meanwellusa.com
Europe: MEAN WELL EUROPE B.V.
Langs de Werf 8, 1185XT Amstelveen, The Netherlands
Tel: +31-20-758-6000
Web: www.meanwell.eu

Compliance Declarations

Declaration of China RoHS Conformity

In order to reduce the impacts on the environment and take greater responsibility for protecting the earth, MEAN WELL confirms its conformity to China RoHS, Administrative Measures for the Restriction of the Use of Hazardous Substances in Electrical and Electronic Products.

Environment Friendly Use Period Label

The product adheres to SJT 11364-2014 (Marking for the Restricted Use of Hazardous Substances in Electronic and Electrical Products) and SJ/Z 11388-2009 (General Guidelines of Environment-friendly Use Period of Electronic Information Products Appendix B).

Names and Contents of Hazardous Substances Lists

Part Name	Lead (Pb)	Mercury (Hg)	Cadmium (Cd)	Hexavalent Chromium (Cr⁶⁺)	Polybrominated Biphenyls (PBB)	Polybrominated Diphenyl Ethers (PBDE)
PCB and its components	X	O	X	O	O	O
Metal structure parts	X	O	O	O	O	O
Plastic structure parts	O	O	O	O	O	O
Accessories	O	O	O	O	O	O
Cables	X	O	O	O	O	O

Legend:

O: The concentration of hazardous substances is less than the concentration limits set by GB/T 26572-2011.
X: The concentration of hazardous substances is over the concentration limits set by GB/T 26572-2011; however, it follows the standard advised by 2011/65/EU.

Declaration of China VOC Conformity

In order to reduce the impacts on the environment and take greater responsibility for protecting the earth, MEAN WELL confirms its conformity to China's Standardization Administration Releases VOC Standards.

Standard No.	Name of the Standard
GB 30981-2020	Limit of harmful substances of industrial protective coatings
GB 33372-2020	Limits for volatile organic compounds content in adhesive
GB 38507-2020	Limits for volatile organic compounds (VOCs) In printing ink
GB 38508-2020	Limits for volatile organic compounds content in cleaning agents

Declaration of Five PBT TSCA Conformity

In order to reduce the impacts on the environment and take greater responsibility for protecting the earth, MEAN WELL hereby confirms that MEAN WELL product series comply with Use and Risk Management for Five PBT Chemicals under TSCA section 6(h).

CAS No.	Substance Name
1163-19-5	Decabromodiphenyl ether (DecaBDE)
68937-41-7	Phenol, isopropylated, phosphate (3:1) PIP (3:1)
732-26-3	2,4,6-Tris (tert-butyl) phenol (2,4,6-TTBP)
133-49-3	Pentachlorothiophenol (PCTP)
87-68-3	Hexachlorobutadiene (HCBD)

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