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Mean Well DDR-480B-12 DC-DC Converter - 400.8W - 16.8~33.6V in 12V out 33.4A

Name: Mean Well DDR-480B-12 DC-DC Converter - 400.8W - 16.8~33.6V in 12V out 33.4A
Brand: Mean Well
SKU: DDR-480B-12
Price: 198.56 USD
Availability: InStock

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

SKU DDR-480B-12

$198.56 USD

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Select model — 8 in this family

DDR-480B-12

DDR-120B-12 12V out 120W In stock$76.53 USD

DDR-480B-12 12V out 400W Low stock$198.56 USD

DDR-120B-24 24V out 120W In stock$76.53 USD

DDR-240B-24 24V out 240W In stock$104.76 USD

DDR-480B-24 24V out 480W In stock$198.56 USD

DDR-120B-48 48V out 120W In stock$76.53 USD

DDR-240B-48 48V out 240W In stock$104.76 USD

DDR-480B-48 48V out.480W Low stock$198.56 USD

Product variants

In stock

Overview

DDR-480B-12 is the 12V output model of this series: rated current 33.4A, rated power 400.8W, typical efficiency 90%.

DDR-480 series is a 480W DIN Rail type DC-DC converter with main features including DIN rail-type easy installation, ultra slim width (85.5mm), 2:1 wide input voltage, fanless design, -40~+80℃ 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 multiple output options: 12V / 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 only 85.5mm
2:1 wide input range
-40~+80℃ wide operating temperature
150% peak load capability
Current sharing up to 1920W(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
Operating attitude up to 5000 meters(Note.6)
Conformal coating
3 years warranty

Specifications

DDR-480B-12Specifications from the official datasheet (2026-09-10 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 33.4A
CURRENT RANGE: 0 ~ 33.4A
RATED POWER: 400.8W
PEAK CURRENT 5sec.^Note.5: 50.1A
PEAK POWER 5sec.^Note.5: 12Vo: 601.2W, 24Vo / 48Vo : 720W
RIPPLE & NOISE (max.)^Note.2: 100mVp-p
VOLTAGE ADJ. RANGE: 12 ~ 14V
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: 16.8 ~ 33.6Vdc
VOLTAGE RANGE 100ms^Note.4: 14.4 ~ 16.8Vdc
EFFICIENCY (Typ.): 90%
DC CURRENT (Typ.): 23A @24Vdc
INRUSH CURRENT (Typ.): 30A
INTERRUPTION OF VOLTAGE SUPPLY: EN50155: 2021-B/C/D type comply with S2 level (10ms)@ full load

PROTECTION

OVERLOAD^Note.5: Normally works within 150% rated output power for more than 5 seconds and then constant current protection 105~135% rated output power with auto-recovery
OVER VOLTAGE: 14.4 ~ 17.5V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE: Shut down o/p voltage, re-power on to recover
REVERSE POLARITY: By internal, MOSFET, no damage, recovers automatically after fault condition is removed
UNDER VOLTAGE LOCKOUT: 24Vin (B - type) :Power ON≥16.8V , OFF≤16.5V

FUNCTION

DC OK REALY CONTACT RATINGS (max.): 30Vdc/1A resistive load
CURRENT SHARING: Up to 1920W (3+1 units). Please refer to the Function Manual
REMOTE ON-OFF CONTROL: Please refer to the Function Manual

ENVIRONMENT

WORKING TEMP.: -40 ~ +80℃ (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.6: 5000 meters / OVCⅡ

SAFETY & EMC

SAFETY STANDARDS: UL 62368-1, IEC 62368-1, AS/NZS 62368-1, EAC TP TC 004 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 (CISRP32) Class A
Radiated BS EN/EN55032 (CISRP32) Class B
Voltage Flicker BS EN/EN61000-3-3
EMC IMMUNITY: BS EN/EN55035

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 (CISRP32)	Class A
Radiated	BS EN/EN55032 (CISRP32)	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: 750.3K hrs min. Telcordia SR-332 (Bellcore) ; 101.7K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 85.5*125.2*129.2mm (W*H*D)
PACKING: 1.375Kg;8pcs/12Kg/0.95CUFT

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. 150% 5 seconds, please refer to peak loading curves.
6. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than2000m(6500ft).
7. 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 )

Technical drawings

DDR-480B-12 Block Diagram — Block Diagram

DDR-480B-12 Derating Curve — Derating Curve

DDR-480B-12 Function Manual — Function Manual

DDR-480B-12 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-480B-12 Inrush Current — Inrush Current

DDR-480B-12 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-480B-12 D D R - 4 8 0 series — D D R - 4 8 0 series

DDR-480B-12 Mechanical Specification — Mechanical Specification

DDR-480B-12 Installation Instruction — Installation Instruction

Typical applications

Downloads

Certificates7

UL Certificate(DDR-480)(EN) PDF Download

Mean Well E183223 UL Certificate PDF Download

DDR-480-EN50155 Certificate PDF Download

Mean Well DDR-480-CB(UL) Certificate PDF Download

Mean Well DDR-480-CE-dec Certificate PDF Download

Mean Well DDR-480-UK-dec Certificate PDF Download

Mean Well EAC Certificate PDF Download

Test reports1

Mean Well DDR-480B-12 Test Report PDF Download

Catalogues1

Mean Well Catalog (Industrial) PDF Download

FAQ

Can I use the DDR-480B-12 to power a large 12V motor drive or resistive heating element from a 24V battery system?

Yes. The DDR-480B-12 delivers 12V at up to 33.4A (400.8W), which is substantial enough for medium motor drives, resistive heaters, or high-current actuators. Its 16.8-33.6V DC input range covers a nominal 24V battery bank (typical 21-29V range) comfortably.

Is the DDR-480B-12 suitable for powering 12V server or networking equipment in a 24V DC data center distribution setup?

Yes. With 400.8W at 12V and 33.4A, it can supply one or more 12V rack devices. The 16.8-33.6V input accepts a 24V DC bus, and the 4KVdc I/O isolation prevents ground loops between the distribution bus and downstream equipment. Its DIN rail mount simplifies installation in power distribution panels.

Can the DDR-480B-12 convert 24V solar or wind DC to 12V for a large off-grid lighting installation?

Yes, provided the input voltage stays within 16.8-33.6V DC. A 24V solar array with battery buffering typically stays in this range. At 400.8W, it can drive substantial 12V LED lighting loads across a facility or campsite. The -40°C to +80°C operating range supports year-round outdoor enclosure deployment.

Can the DDR-480B-12 operate in a cold-start outdoor environment without preheating?

Yes. The DDR-480B-12 is rated for -40°C to +80°C operating temperature, so it starts and runs in extreme cold without a separate heater. Its humidity rating is 5-95% RH non-condensing, so condensation must be avoided. Mount it inside a weatherproof NEMA or IP-rated enclosure to protect it from direct moisture exposure.

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Model	Power	Voltage	Current	IP Rating
Mean Well DDR-480B-48 DC-DC Converter - 480W - 16.8~33.6V in 48V out 10A	480W	48V	10A	IP20	View

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