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Mean Well DDR-120C-48 DC-DC Converter - 120W - 33.6~67.2V in 48V out 2.5A

Name: Mean Well DDR-120C-48 DC-DC Converter - 120W - 33.6~67.2V in 48V out 2.5A
Brand: Mean Well
SKU: DDR-120C-48
Price: 68.88 USD
Availability: InStock

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

SKU DDR-120C-48

$68.88 USD

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DDR-120C-48

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DDR-240C-48 48V out 240W In stock $97.43 USD

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

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Overview

DDR-120C-48 is the 48V output model of this series: rated current 2.5A, rated power 120W, typical efficiency 92%.

DDR-120 series is a 120W DIN Rail type DC-DC converter with main features including DIN rail-type easy installation, ultra slim width (32mm), 2:1 wide input voltage, fanless design, -40~+70℃ wide operating temperature, 4KVdc I/O isolation, 150% peak load, adjustable output voltage and full protective futore, increasing system insulation level and voltage drop compensation along cable...etc.

Features

Compliance to BS EN/EN50155 and BS EN/EN45545-2 railway standard
Width only 32mm
2:1 wide input range
-40~+70℃ wide working temperature
150% peak load capability
DC output adjustable
Cooling by free air convection
Can be installed on DIN rail TS-35/7.5 or 15
Protections: Short circuit / Overload / Over voltage / Input reverse polarity / Input under voltage protection
4KVdc I/O isolation(Reinforced isolation)
Conformal coating
3 years warranty

Specifications

DDR-120C-48Specifications from the official datasheet (2026-09-10 edition)

OUTPUT

DC VOLTAGE: 48V
RATED CURRENT: 2.5A
CURRENT RANGE: 0 ~ 2.5A
RATED POWER: 120W
PEAK CURRENT: 3.75A
PEAK POWER^Note.5: 180W (3sec.)
RIPPLE & NOISE (max.)^Note.2: 50mVp-p
VOLTAGE ADJ. RANGE: 48 ~ 56V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 500ms, 60ms @48Vdc
HOLD UP TIME (Typ.): Please refer to page 7 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE^Note.4: 33.6 ~ 67.2Vdc
EFFICIENCY (Typ.): 92%
DC CURRENT (Typ.): 2.8A @48Vdc
INRUSH CURRENT (Typ.): 5A @48Vdc
INTERRUPTION OF VOLTAGE SUPPLY: EN50155:2021-comply with S1 level

PROTECTION

OVERLOAD: Normally works within 150% rated output power for more than 3 seconds and then constant current protection 105~135% rated output power with auto-recovery
OVER VOLTAGE: 57.6 ~ 67.2V Protection type : Shut down o/p voltage, re-power on to recover
REVERSE POLARITY: By internal MOSFET, no damage, recovers automatically after fault condition removed
UNDER VOLTAGE LOCKOUT: 48Vin (C - type) :Power ON≥33.6V , OFF≤33V

ENVIRONMENT

WORKING TEMP.: -40 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 5 ~ 95% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +85℃, 5 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 55℃)
VIBRATION: Component:10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes; Mounting: Compliance to IEC61373
OPERATING ALTITUDE: 5000 meters

SAFETY & EMC

SAFETY STANDARDS: IEC 62368-1, UL 62368-1, EAC TP TC 004, AS/NZS 62368.1 approved; Design refer to UL508
WITHSTAND VOLTAGE: I/P-O/P:4KVdc I/P-FG:2.5KVdc O/P-FG:2.5KVdc
ISOLATION RESISTANCE: I/P-O/P, I/P-FG, O/P-FG:>100M Ohms / 500Vdc / 25℃/ 70% RH
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032 Class B
Radiated BS EN/EN55032 Class B
Voltage Flicker BS EN/EN61000-3-3
EMC IMMUNITY: BS EN/EN55035 , BS EN/EN61000-6-2(BS EN/EN50082-2)

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 3, 6KV contact; criteria A
Radiated BS EN/EN61000-4-3 Level 3, 10V/m; criteria A
EFT / Burst BS EN/EN61000-4-4 Level 3, 2KV; criteria A
Surge BS EN/EN61000-4-5 Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-FG ;criteria A
Conducted BS EN/EN61000-4-6 Level 3, 10V; criteria A
Magnetic Field BS EN/EN61000-4-8 Level 4, 30A/m; criteria A
RAILWAY STANDARD: Compliance to BS EN/EN45545-2 for fire protection ; Meet BS EN/EN50155 / IEC60571 including IEC61373 for shock & vibration, BS EN/EN50121-3-2 for EMC

Parameter	Standard	Test Level
Conducted	BS EN/EN55032	Class B
Radiated	BS EN/EN55032	Class B
Voltage Flicker	BS EN/EN61000-3-3

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, 8KV air; Level 3, 6KV contact; criteria A
Radiated	BS EN/EN61000-4-3	Level 3, 10V/m; criteria A
EFT / Burst	BS EN/EN61000-4-4	Level 3, 2KV; criteria A
Surge	BS EN/EN61000-4-5	Level 3, 1KV/Line-Line ;Level 3, 2KV/Line-Line-FG ;criteria A
Conducted	BS EN/EN61000-4-6	Level 3, 10V; criteria A
Magnetic Field	BS EN/EN61000-4-8	Level 4, 30A/m; criteria A

OTHERS

MTBF: 1769.5K hrs min. Telcordia SR-332 (Bellcore) ; 214.5K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 32*125.2*102mm (W*H*D)
PACKING: 510g; 28pcs/15.3Kg/1.23CUFT

Test conditions and notes7

1. All parameters NOT specially mentioned are measured at normal input (C:48Vdc , D:110Vdc) , rated load and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Derating may be needed under low input voltage. Please check the derating curve for more details.
5. 3 seconds max., please refer to peak loading curves.
6. The power supply is considered as an independent unit, but the final equipment still need to re-confirm that the whole system complies with the EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )
7. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).

Technical drawings

DDR-120C-48 Block Diagram — Block Diagram

DDR-120C-48 Derating Curve — Derating Curve

DDR-120C-48 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-120C-48 Inrush Current — Inrush Current

DDR-120C-48 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-120C-48 D D R - 1 2 0 series — D D R - 1 2 0 series

DDR-120C-48 Mechanical Specification — Mechanical Specification

Typical applications

Downloads

Certificates2

CE Certificate(DDR-120)(EN) PDF Download

EMC Certificate(DDR-120)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the DDR-120C-48 to convert a 48V battery bank to 48V regulated DC for industrial automation equipment?

Yes. The DDR-120C-48 accepts a wide DC input range of 33.6-67.2V and outputs a regulated 48V at up to 2.5A (120W). This makes it well suited for converting unregulated battery or solar bus voltages into a stable 48V rail for PLCs, sensors, and other DIN rail-mounted automation devices.

Is the DDR-120C-48 suitable for powering 48V PoE switches in a telecom or IT cabinet?

Yes. With 120W at 48V and 2.5A output, it can supply a small PoE switch or injector from a 33.6-67.2V DC bus. The 4KVdc input-to-output withstand voltage keeps the networking equipment isolated from the input side, and EMC emissions meet EN55032 Class B.

Can I use the DDR-120C-48 to step down a 60V solar charge bus to 48V for embedded systems?

Yes, provided your solar bus stays within the 33.6-67.2V input window. The DDR-120C-48 will regulate the output to 48V regardless of input fluctuations within that range. Its slim 32mm width and DIN rail mount make it easy to integrate into a solar charge controller enclosure.

Will the DDR-120C-48 operate reliably in an unheated outdoor control cabinet?

It is rated for -40°C to +70°C operating temperature (with load derating at higher temperatures per the derating curve) and 5-95% RH non-condensing humidity, which covers unheated cabinets in many climates. The datasheet lists no IP rating, so the unit should be mounted inside a sealed enclosure that protects it from rain, dust and condensation.

What are the differences between the DDR-120A, 120B, 120C, and 120D variants at 48V?

All four output 48V on a DIN rail, but they differ in input range and power. The DDR-120A-48 accepts 9-18V DC input and delivers 100.8W at 2.1A. The DDR-120B-48 accepts 16.8-33.6V and delivers 120W at 2.5A. The DDR-120C-48 accepts 33.6-67.2V and delivers 120W at 2.5A. The DDR-120D-48 accepts 67.2-154V and delivers 120W at 2.5A. Choose the variant whose input range matches your DC bus voltage.

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well DDR-120C-24 DC-DC Converter - 120W - 33.6~67.2V in 24V out 5A	120W	24V	5A	IP20	$61.10	View
Mean Well DDR-120C-12 DC-DC Converter - 120W - 33.6~67.2V in 12V out 10A	120W	12V	10A	IP20	$68.88	View

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