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Mean Well DDR-240D-24 DC-DC Converter - 240W - 67.2~154V in 24V out 10A

Name: Mean Well DDR-240D-24 DC-DC Converter - 240W - 67.2~154V in 24V out 10A
Brand: Mean Well
SKU: DDR-240D-24
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-24 is the 24V output model of this series: rated current 10A, rated power 240W, typical efficiency 92%.

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

OUTPUT

DC VOLTAGE: 24V
RATED CURRENT: 10A
CURRENT RANGE: 0 ~ 10A
RATED POWER: 240W
PEAK CURRENT: 15A
PEAK POWER^Note.5: 360W (3sec.)
RIPPLE & NOISE (max.)^Note.2: 80mVp-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
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%
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: 28.8 ~ 35V 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-24 Block Diagram — Block Diagram

DDR-240D-24 Derating Curve — Derating Curve

DDR-240D-24 Function Manual — Function Manual

DDR-240D-24 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-240D-24 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-240D-24 D D R - 2 4 0 series — D D R - 2 4 0 series

DDR-240D-24 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-24 to convert a 110V DC distribution bus to 24V for control equipment?

Yes. The DDR-240D-24 accepts 67.2-154V DC input, which covers the standard 110V DC bus voltage used in legacy industrial plants, substations, and railway systems. It delivers 24V at up to 10A (240W) for PLCs, HMI panels, relays, and other DIN rail-mounted control devices.

Is the DDR-240D-24 suitable for converting high-voltage DC from a solar string to 24V for site monitoring?

Yes, provided the solar string voltage stays within 67.2-154V DC. The DDR-240D-24 outputs a stable 24V at up to 10A, which can power weather stations, data loggers, cameras, and communication equipment at remote solar farm sites without needing an AC inverter.

Can the DDR-240D-24 power 24V equipment in a railway signaling or rolling stock cabinet?

Yes. Railway DC buses often operate in the 72-110V DC range, which falls within the DDR-240D-24's 67.2-154V input window. Its -40°C to +70°C operating range, 4KVdc I/O isolation, and compliance with EN50155 / IEC61373 (shock & vibration) and EN50121-3-2 (EMC) make it well suited for railway environments.

Can the DDR-240D-24 be installed in harsh outdoor environments like utility substations?

The DDR-240D-24 operates from -40°C to +70°C (with derating at high temperatures per the derating curve) and is rated for 5-95% RH non-condensing. It should be mounted inside a weatherproof DIN rail enclosure to protect it from direct rain and condensation, but it handles the wide temperature swings typical of substations.

Is the DDR-240D-24 appropriate for stepping down a 125V DC battery bank used in UPS backup systems?

Yes. A 125V DC battery bank is within the 67.2-154V input range. The DDR-240D-24 converts this to a regulated 24V at 10A (240W), suitable for powering emergency lighting controllers, alarm panels, or communication equipment that must run on the UPS-backed DC bus during outages.

What are the differences between the DDR-240B-24, DDR-240C-24, and DDR-240D-24?

All three deliver 240W at 24V/10A and share the same 125.2 x 113.5 x 40.0 mm DIN rail form factor. The DDR-240B-24 accepts 16.8-33.6V DC input (for 24V bus systems), the DDR-240C-24 accepts 33.6-67.2V DC input (for 48V bus systems), and the DDR-240D-24 accepts 67.2-154V DC input (for high-voltage DC distribution). Select based on your source bus voltage.

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