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Mean Well

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

2:1 or 4:1 wide input range, fanless design, 4KVdc I/O isolation, ultra slim dimensions
SKU:
DDR-120D-48
Model
Please for Pricing
|

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
  • Brand
    Mean Well
  • Series
    DDR Series
  • Power Rating
    120 Watt
  • Output Voltage
    48 Volt
  • Rated Current
    2.5 Ampere
  • Input Voltage
    67.2V~154V
  • Standards Met
    CE,EMC
  • Operation Mode
    Constant Voltage
  • Operating Temperature
    -40°C~85°C
  • Warranty
    2 Year
  • Length
    12.52 cm
  • Width
    10.2 cm
  • Height
    3.2 cm
  • Weight
    0.51 kg

File Downloads

::specification::

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

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

Please for Pricing

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

Model

  • 100W - 48V out - 9~18V in
  • 120W - 48V out - 16.8~33.6V in
  • 120W - 48V out - 33.6~67.2V in
  • 120W - 48V out - 67.2~154V in
  • 240W - 48V out - 16.8~33.6V in
  • 240W - 48V out - 33.6~67.2V in
  • 240W - 48V out - 67.2~154V in
  • 480W - 48V out - 16.8~33.6V in
  • 480W - 48V out - 33.6~67.2V in
  • 480W - 48V out - 67.2~154V in
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