Mean Well DDR-120D-24 DC-DC Converter - 120W | Auckland Distributor

Overview

DDR-120D-24 is the 24V output model of this series: rated current 5A, rated power 120W, typical efficiency 91%.

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-120D-24Specifications from the official datasheet (2026-09-10 edition)

OUTPUT

DC VOLTAGE: 24V
RATED CURRENT: 5A
CURRENT RANGE: 0 ~ 5A
RATED POWER: 120W
PEAK CURRENT: 7.5A
PEAK POWER^Note.5: 180W (3sec.)
RIPPLE & NOISE (max.)^Note.2: 50mVp-p
VOLTAGE ADJ. RANGE: 24 ~ 28V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 500ms, 60ms @110Vdc
HOLD UP TIME (Typ.): Please refer to page 7 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE^Note.4: 67.2 ~ 154Vdc
EFFICIENCY (Typ.): 91%
DC CURRENT (Typ.): 1.3A @110Vdc
INRUSH CURRENT (Typ.): 5A @110Vdc
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: 28.8 ~ 33.6V 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: 110Vin (D - type):Power ON≥67.2V , OFF≤65V

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-120D-24 Block Diagram — Block Diagram

DDR-120D-24 Derating Curve — Derating Curve

DDR-120D-24 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-120D-24 Inrush Current — Inrush Current

DDR-120D-24 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-120D-24 D D R - 1 2 0 series — D D R - 1 2 0 series

DDR-120D-24 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-120D-24 to supply 24V automation equipment from a 110V DC plant bus?

Yes. The DDR-120D-24 accepts 67.2-154V DC and outputs 24V at 5A (120W), which is the standard voltage for most industrial PLCs, solenoid valves, and 24V I/O modules. Its DIN rail form factor lets it drop directly into an existing automation panel alongside other rail-mounted devices.

Is the DDR-120D-24 appropriate for powering 24V HVAC actuators from a high-voltage DC bus?

Yes. HVAC motorized damper actuators and valve actuators commonly run on 24V DC, and the DDR-120D-24 provides 120W at 5A from a 67.2-154V input. Verify that the combined inrush current of your actuators does not exceed the converter's 7.5A peak current (180W for 3 seconds max.), and keep steady-state load under 120W.

Can the DDR-120D-24 step down a 125V DC battery system to power 24V communication radios?

Yes. A 125V DC battery bank is within the 67.2-154V input range. At 24V/5A the converter can supply radios, modems, and small network switches typically found in utility or transportation communication cabinets. The 4KVdc input-to-output isolation separates the battery system from the radio equipment.

Can the DDR-120D-24 be installed in a non-climate-controlled equipment shelter?

Yes, within its ratings. The operating range is -40°C to +70°C, with load derating at higher temperatures per the derating curve, and humidity of 5-95% RH non-condensing. Mount it inside a sealed enclosure to protect against dust and condensation, as the datasheet lists no IP ingress rating for the converter.

What input range options are available for 120W DDR converters with 24V output?

There are four input-range variants. The DDR-120A-24 covers 9-18V input (100.8W, 4.2A). The DDR-120B-24 covers 16.8-33.6V (120W, 5A). The DDR-120C-24 covers 33.6-67.2V (120W, 5A). The DDR-120D-24 covers 67.2-154V (120W, 5A). Pick the suffix whose input window includes your DC source voltage.

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Model	Power	Voltage	Current	IP Rating
Mean Well DDR-120D-48 DC-DC Converter - 120W - 67.2~154V in 48V out 2.5A	120W	48V	2.5A	IP20	View
Mean Well DDR-120D-12 DC-DC Converter - 120W - 67.2~154V in 12V out 10A	120W	12V	10A	IP20	View

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Mean Well DDR-120D-24 DC-DC Converter - 120W - 67.2~154V in 24V out 5A

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Overview

Features

Specifications

OUTPUT

INPUT

PROTECTION

ENVIRONMENT

SAFETY & EMC

OTHERS

Technical drawings

Typical applications

Downloads

Certificates2

Catalogues2

FAQ

Payment & Security

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Mean Well DDR-120D-24 DC-DC Converter - 120W - 67.2~154V in 24V out 5A

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