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Mean Well

Mean Well DDR-120B-48 DC-DC Converter - 120W - 16.8~33.6V in 48V out

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

Description

The DDR-120B is a 120W DIN Rail type DC-DC converter for railway and industrial applications. With a 16.8~33.6Vdc input range (nominal 24Vdc), it converts from 24Vdc 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: 16.8~33.6Vdc (nominal 24Vdc)
  • ✓ 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
    16.8V~33.6V
  • 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-120B-48 to power 48V networking equipment from a 24V DC bus?

Yes. The DDR-120B-48 steps up a 16–33V DC input to 48V at up to 2.5A (120W). This suits PoE switches, network routers, and telecom equipment that require a 48V supply, commonly deployed in industrial Ethernet or building automation networks fed by 24V DC infrastructure.

Is this converter suitable for powering 48V DC loads in a railway signaling cabinet?

The DDR-120B-48 operates from -40°C to +85°C and features 4KVdc isolation, making it robust for railway-adjacent environments with wide temperature swings and electrical noise. Its 120W output at 48V can supply signaling relays, communication modules, or monitoring systems from a 24V trackside DC bus.

Can I use the DDR-120B-48 to create a 48V bus for PoE-powered IP cameras from a 24V solar system?

Yes. With a 16–33V input range, the DDR-120B-48 accepts voltage from a 24V solar battery bank and converts it to 48V at 2.5A. This is enough to power a small PoE switch serving several IP cameras in a remote surveillance application. The fanless design minimizes maintenance needs.

Can the DDR-120B-48 operate without ventilation in a dust-prone industrial environment?

The DDR-120B-48 uses fanless convection cooling, so it does not draw in dust-laden air. It can be mounted in a sealed enclosure as long as internal temperatures remain within the -40°C to +85°C range. For dusty environments, a sealed NEMA 12 or IP54 cabinet is recommended.

Is the DDR-120B-48 appropriate for charging 48V lithium battery packs?

The DDR-120B-48 operates in constant voltage mode and outputs a fixed 48V. It is not a battery charger and does not have charge current limiting, CC/CV profiles, or battery management features. For lithium battery charging, a dedicated charger with proper charge algorithms is required.

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Mean Well DDR-120B-48 DC-DC Converter - 120W - 16.8~33.6V in 48V out
Mean Well

Mean Well DDR-120B-48 DC-DC Converter - 120W - 16.8~33.6V in 48V out

Please for Pricing

The DDR-120B is a 120W DIN Rail type DC-DC converter for railway and industrial applications. With a 16.8~33.6Vdc input range (nominal 24Vdc), it converts from 24Vdc 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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