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Mean Well DDR-120D-12 DC-DC Converter - 120W - 67.2~154V in 12V out

Name: Mean Well DDR-120D-12 DC-DC Converter - 120W - 67.2~154V in 12V out
Brand: Mean Well
SKU: DDR-120D-12
Price: 64.85 USD
Availability: InStock

2:1 or 4:1 wide input rangefanless design4KVdc I/O isolationultra slim dimensions

SKU:

DDR-120D-12

$64.85 USD

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Select model — 8 in this family

DDR-120D-12

DDR-120D-12 12V out 120W In stock $64.85 USD

DDR-480D-12 12V out 400W Low stock $184.66 USD

DDR-120D-24 24V out 120W Low stock $68.88 USD

DDR-240D-24 24V out 240W In stock $93.90 USD

DDR-480D-24 24V out 480W In stock $184.66 USD

DDR-120D-48 48V out 120W Low stock $64.85 USD

DDR-240D-48 48V out 240W In stock $97.44 USD

DDR-480D-48 48V out 480W Low stock $184.66 USD

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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

Brand

Mean Well
Series

DDR Series
Power Rating

120 Watt
Output Voltage

12 Volt
Rated Current

10 Ampere
Input Voltage

67.2V~154V
No of Output

1
Dimming Control

None
Standards Met

CE,EMC
Operation Mode

Constant Voltage
Operating Temperature

-40°C~85°C
Warranty

2 Year
Length

4.93 in
Width

4.02 in
Height

1.26 in
Weight

1.12 lb

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.

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well DDR-120D-48 DC-DC Converter - 120W - 67.2~154V in 48V out	120W	48V	2.5A	Indoor	$64.85	View
Mean Well DDR-120D-24 DC-DC Converter - 120W - 67.2~154V in 24V out	120W	24V	5A	Indoor	$68.88	View

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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

Mean Well DDR-120D-12 DC-DC Converter - 120W - 67.2~154V in 12V out

Select model — 8 in this family

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Mean Well DDR-120D-12 DC-DC Converter - 120W - 67.2~154V in 12V out

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