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Mean Well DDR-240D-48 DC-DC Converter - 240W - 67.2~154V in 48V out 5A

Name: Mean Well DDR-240D-48 DC-DC Converter - 240W - 67.2~154V in 48V out 5A
Brand: Mean Well
SKU: DDR-240D-48
Price: 104.77 USD
Availability: InStock

$104.77 USD

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Model

12V out 120W 12V out 400W 24V out 120W 24V out 240W 24V out 480W 48V out 120W 48V out 240W 48V out 480W

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Overview

DDR-240D-48 is the 48v output model of this series: rated current 5A, rated power 240W, typical efficiency 92.5%.

DDR-240 series is a 240W DIN Rail type DC-DC converter with main features including DIN rail-type easy installation, ultra slim width (40mm), 2:1 wide input voltage, fanless design, -40~+70℃ wide operating temperature, 4KVdc I/O isolation, 150% peak load, current sharing, DC OK, adjustable output voltage and full protective functions. This series of models has various input options: 16.8~33.6V / 33.6~67.2V / 67.2~154V and two output options: 24V / 48V and can be used for industrial & railway control, security control, communication system and other fields. Suitable applications include to DC buck/boost regulator, 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 onlly 40mm
2:1 wide input range
-40~+70℃ wide working temperature
150% peak load capability
Current sharing up to 960W(3+1)
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 / Over temperature / Input reverse polarity/ Input under voltage protection
4KVdc I/O isolation(Reinforced isolation)
DC OK relay contact
Remote ON-OFF control
Conformal coating
3 years warranty

Specifications

DDR-240D-48Specifications from the official datasheet (2026-09-10 edition)

OUTPUT

DC VOLTAGE: 48v
RATED CURRENT: 5A
CURRENT RANGE: 0 ~ 5A
RATED POWER: 240W
PEAK CURRENT: 7.5A
PEAK POWER^Note.5: 360W (3sec.)
RIPPLE & NOISE (max.)^Note.2: 100mVp-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
HOLD UP TIME (Typ.): Please refer to page 6 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE CONTINUOUS^Note.4: 67.2 ~ 154Vdc
VOLTAGE RANGE 100ms^Note.4: 66 ~ 67.2Vdc
EFFICIENCY (Typ.): 92.5%
DC CURRENT (Typ.): 2.5A @110Vdc
INRUSH CURRENT (Typ.): 30A
INTERRUPTION OF VOLTAGE SUPPLY: EN50155:2021-Comply with S1 level

PROTECTION

OVERLOAD^Note.5: 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 ~ 65V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE: Shut down o/p voltage, re-power on to recover
UNDER VOLTAGE LOCKOUT: 110Vin (D - type):Power ON≥67.2V , OFF≤65V

FUNCTION

DC OK REALY CONTACT RATINGS (max.): 30Vdc/1A resistive load
CURRENT SHARING: Up to 960W (3+1 units). Please refer to the Function Manual
REMOTE ON-OFF CONTROL: Please refer to the Function Manual

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^Note.7: 5000 meters

SAFETY & EMC

SAFETY STANDARDS: IEC 62368-1, UL 62368-1, EAC TP TC 004, AS/NZS 62368.1 approved
WITHSTAND VOLTAGE: I/P-O/P:4KVdc I/P-FG:2.5KVdc O/P-FG:0.71KVdc
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: 1415.6K hrs min. Telcordia SR-332 (Bellcore) ; 189.9K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 40*125.2*113.5mm (W*H*D)
PACKING: 0.76Kg;20psc/16.2Kg/1.0CUFT

Test conditions and notes7

1. All parameters NOT specially mentioned are measured at normal input (B:24Vdc , 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 than2000m(6500ft).

Technical drawings

DDR-240D-48 Block Diagram — Block Diagram

DDR-240D-48 Derating Curve — Derating Curve

DDR-240D-48 Function Manual — Function Manual

DDR-240D-48 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-240D-48 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-240D-48 D D R - 2 4 0 series — D D R - 2 4 0 series

DDR-240D-48 Mechanical Specification — Mechanical Specification

Typical applications

Downloads

Certificates3

CE Certificate(DDR-240)(EN) PDF Download

UL Certificate(DDR-240)(EN) PDF Download

EMC Certificate(DDR-240)(EN) PDF Download

Catalogues2

Mean Well DC-DC Catalog PDF Download

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the DDR-240D-48 to convert a 110V DC station battery to 48V for telecom equipment?

Yes. The DDR-240D-48 accepts 67.2-154V DC input and outputs a regulated 48V at 5A (240W). A 110V DC station battery falls squarely within its input range, making it suitable for powering 48V telecom racks, PoE switches, or communication gear from a utility-grade DC battery bank.

Is the DDR-240D-48 suitable for converting high-voltage DC from a solar array into 48V for a battery storage system?

Yes, as long as the solar source voltage stays within 67.2-154V DC. The DDR-240D-48 delivers a regulated 48V at up to 5A, which can feed a 48V battery management system or charge controller in hybrid or off-grid solar installations without requiring an AC conversion stage.

Can I use the DDR-240D-48 in a railway or traction power application?

Yes. Many railway auxiliary DC buses operate in the 72-110V range, which is within the DDR-240D-48's 67.2-154V input window. It meets EN50155 / IEC60571 (including IEC61373 shock & vibration) and EN50121-3-2 for EMC, complies with EN45545-2 fire protection, and offers a -40°C to +70°C operating range and 4KVdc I/O isolation for rolling stock cabinets or trackside signal enclosures.

Will the DDR-240D-48 function in an unventilated enclosure exposed to extreme cold?

Yes. The DDR-240D-48 is rated for operation from -40°C to +70°C (with derating at high temperatures per the derating curve). It will start and operate at temperatures as low as -40°C, which covers enclosed outdoor utility cabinets, cold-climate installations, and cold-room applications without requiring supplemental heating.

Can the DDR-240D-48 power 48V DC loads from a 125V DC UPS battery system?

Yes. A 125V DC battery bank falls within the 67.2-154V input range. The DDR-240D-48 provides a stable 48V output at up to 5A (240W), suitable for network switches, security systems, or emergency communication equipment that must stay online during mains failures.

What are the differences between the DDR-240B-48, DDR-240C-48, and DDR-240D-48?

All three output 240W at 48V/5A and share the same DIN rail housing. The DDR-240B-48 accepts 16.8-33.6V DC input, the DDR-240C-48 accepts 33.6-67.2V DC input, and the DDR-240D-48 accepts 67.2-154V DC input. The letter suffix (B, C, D) indicates the input voltage tier, so select the variant that matches your source DC bus voltage.

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