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

Name: Mean Well DDR-120B-48 DC-DC Converter - 120W - 16.8~33.6V in 48V out
Brand: Mean Well
SKU: DDR-120B-48
Price: 65.99 USD
Availability: InStock

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

SKU:

DDR-120B-48

$65.99 USD ~~$68.88~~

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Select model — 8 in this family

DDR-120B-48

DDR-120B-12 12V out 120W In stock $63.90 USD

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

DDR-120B-24 24V out 120W In stock $68.88 USD

DDR-240B-24 24V out 240W In stock $96.10 USD

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

DDR-120B-48 48V out 120W In stock $65.99 USD

DDR-240B-48 48V out 240W In stock $89.01 USD

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

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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

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
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-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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Model	Power	Voltage	Current	IP Rating	Price
Mean Well DDR-120B-12 DC-DC Converter - 120W - 16.8~33.6V in 12V out	120W	12V	10A	Indoor	$63.90	View

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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

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

Select model — 8 in this family

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

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