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Mean Well DDR-120D-48 DC-DC Converter - 120W - 67.2~154V in 48V out

Name: Mean Well DDR-120D-48 DC-DC Converter - 120W - 67.2~154V in 48V out
Brand: Mean Well
SKU: DDR-120D-48
Price: 64.85 USD
Availability: InStock

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

SKU:

DDR-120D-48

$64.85 USD

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Select model — 8 in this family

DDR-120D-48

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

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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

48 Volt
Rated Current

2.5 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-48 to power 48V PoE equipment from a 110V DC distribution bus?

Yes. The DDR-120D-48 accepts 67.2-154V DC input and outputs a regulated 48V at 2.5A (120W). This is sufficient for a small PoE switch or PoE injector in utility substations or railway installations where 110V DC buses are common. The 4KVdc I/O isolation keeps sensitive Ethernet equipment protected from the high-voltage bus.

Is the DDR-120D-48 a good fit for converting a 125V DC UPS output to 48V for telecom loads?

Yes. The 67.2-154V input range comfortably covers a 125V DC UPS bus including its charge and discharge voltage swing. The 120W at 48V/2.5A output can feed small telecom modules, fiber optic media converters, or 48V rack equipment. DIN rail mounting integrates easily into standard telecom distribution panels.

Can the DDR-120D-48 supply 48V to industrial Ethernet switches in a process control cabinet?

Yes. Many managed industrial Ethernet switches require 48V DC input, and 120W at 2.5A provides enough power for a mid-range switch plus a few PoE-powered field devices. The fanless operation and ultra-slim 32mm width help conserve space and avoid introducing vibration into the control cabinet.

Will the DDR-120D-48 work in extreme-temperature outdoor enclosures?

Yes. It operates from -40°C to +85°C, covering arctic cold starts through hot desert conditions. Since it has no internal fan, there are no moving parts to freeze or wear out. Install it inside a sealed NEMA-rated enclosure to guard against moisture and particulate ingress, as the converter does not carry its own IP rating.

How do the DDR-120 48V output models differ across the A, B, C, and D input ranges?

All four deliver 48V on a DIN rail mount. The DDR-120A-48 accepts 9.2-18V input at 100.8W/2.1A. The DDR-120B-48 accepts 16.8-33.6V at 120W/2.5A. The DDR-120C-48 accepts 33.6-67.2V at 120W/2.5A. The DDR-120D-48 accepts 67.2-154V at 120W/2.5A. The letter suffix identifies the input voltage range.

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well DDR-120D-12 DC-DC Converter - 120W - 67.2~154V in 12V out	120W	12V	10A	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-48 DC-DC Converter - 120W - 67.2~154V in 48V out

Select model — 8 in this family

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Mean Well DDR-120D-48 DC-DC Converter - 120W - 67.2~154V in 48V out

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