Over 15 years experience of providing support of MEAN WELL Power Supplies
Image shown is a representation only. Exact specifications should be obtained from the product datasheet.
Mean Well DDR-120D-12 DC-DC Converter - 120W - 67.2~154V in 12V out
Please Login for Pricing
Description
Description
The DDR-120D is a 120W DIN Rail type DC-DC converter for railway and industrial applications. With a 67.2~154Vdc input range (nominal 110Vdc), it converts from 110Vdc on-board bus supplies to isolated 12V, 24V, or 48V outputs. Compliant with EN50155:2021 S1 level and rated per IEC61373 for shock and vibration, it operates from -40~+70°C in demanding transport environments.
Key Features
- ✓ Input voltage range: 67.2~154Vdc (nominal 110Vdc)
- ✓ 32mm width — DIN rail TS-35 compatible
- ✓ DC output voltage adjustable ±10%
- ✓ 4KVdc reinforced I/O isolation
- ✓ Wide operating temperature: -40°C ~ +70°C
- ✓ Protections: Overload / Over voltage / Reverse polarity / Under voltage lockout
- ✓ EN50155:2021 S1 level compliance (interruption of voltage supply)
- ✓ Railway standards: EN45545-2 (fire protection), EN50155 / IEC60571, IEC61373 (shock & vibration)
- ✓ Safety approvals: IEC 62368-1, UL 62368-1, AS/NZS 62368.1, EAC TP TC 004
- ✓ 3 years warranty
Specifications
Specifications
-
BrandMean Well
-
SeriesDDR Series
-
Power Rating120 Watt
-
Output Voltage12 Volt
-
Rated Current10 Ampere
-
Input Voltage67.2V~154V
-
Standards MetCE,EMC
-
Operation ModeConstant Voltage
-
Operating Temperature-40°C~85°C
-
Warranty2 Year
-
Length12.52 cm
-
Width10.2 cm
-
Height3.2 cm
-
Weight0.51 kg
File Downloads
File Downloads
::specification::
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Frequently Asked Questions
Can I use the DDR-120D-12 to power 12V sensors and relays from a 110V DC distribution bus?
Yes. The DDR-120D-12 accepts 67.2-154V DC input, covering nominal 110V DC buses common in legacy industrial plants and railway signaling systems. It provides a regulated 12V output at up to 10A (120W), which is sufficient for banks of sensors, relay modules, and indicator lights on a DIN rail panel.
Is the DDR-120D-12 a good choice for converting a 125V DC UPS bus to 12V for embedded controllers?
Yes. A 125V DC UPS bus falls well within the 67.2-154V input range. The 120W capacity at 12V/10A gives you headroom for embedded single-board computers, HMI displays, and peripheral devices. The 4KVdc I/O isolation protects sensitive electronics from noise or faults on the high-voltage bus.
Can I run 12V LED indicator strips in a control panel using the DDR-120D-12?
Yes. At 12V and 10A you have 120W available, which is enough for several meters of 12V indicator or status LED strips inside a control panel. The fanless design avoids introducing vibration or noise into the panel, and the slim 32mm DIN rail profile conserves space on the rail.
Is the DDR-120D-12 suitable for cold-start environments like outdoor substations?
Yes. Its -40°C to +85°C operating temperature range covers extreme cold-start conditions found in outdoor substations, telecom huts, and remote monitoring stations. It should be installed inside a sealed enclosure to protect against moisture and debris since it does not carry a dedicated IP rating.
How does the DDR-120D-12 compare to other 120W DDR models with 12V output?
The DDR series offers four input ranges at the 120W/12V level. The DDR-120A-12 accepts 9.2-18V input (99.6W, 8.3A). The DDR-120B-12 accepts 16.8-33.6V (120W, 10A). The DDR-120C-12 accepts 33.6-67.2V (120W, 10A). The DDR-120D-12 accepts 67.2-154V (120W, 10A). Select the suffix letter that matches your DC source voltage.
Other DDR-120D Models
2 other models| Model | Power | Voltage | Current | IP Rating | |
|---|---|---|---|---|---|
| Mean Well DDR-120D-48 DC-DC Converter - 120W - 67.2~154V in 48V out | 120W | 48V | 2.5A | Indoor | View |
| Mean Well DDR-120D-24 DC-DC Converter - 120W - 67.2~154V in 24V out | 120W | 24V | 5A | Indoor | View |
