Mean Well DDR-120B-12 DC-DC Converter - 120W - 16.8~33.6V in 12V out

Overview

DDR-120B-12 is the 12V output model of this series: rated current 10A, rated power 120W, typical efficiency 89%.

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 functions. This series of models has various input options: 9~18V / 16.8~33.6V / 33.6~67.2V / 67.2~154V and various output options: 12V / 24V / 48V and can be used for industrial & railway control, security control, communication system and other fields. Suitable applications include 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 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-120B-12Specifications from the official datasheet (2026-09-10 edition)

OUTPUT

DC VOLTAGE: 12V
RATED CURRENT: 10A
CURRENT RANGE: 0 ~ 10A
RATED POWER: 120W
PEAK CURRENT: 15A
PEAK POWER^Note.5: 180W (3sec.)
RIPPLE & NOISE (max.)^Note.2: 50mVp-p
VOLTAGE ADJ. RANGE: 9 ~ 14V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
SETUP, RISE TIME: 500ms, 60ms @24Vdc
HOLD UP TIME (Typ.): Please refer to page 7 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE^Note.4: 16.8 ~ 33.6Vdc
EFFICIENCY (Typ.): 89%
DC CURRENT (Typ.): 5.6A @24Vdc
INRUSH CURRENT (Typ.): 5A @ 24Vdc
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: 14.4 ~ 16.8V 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: 24Vin (B - type) :Power ON≥16.8V , OFF≤16.5V

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^{Note 6}: Parameter Standard Test Level

Conducted BS EN/EN55032 Class B
Radiated BS EN/EN55032 Class B
Voltage Flicker BS EN/EN61000-3-3 -----
Harmonic Current ----- -----
EMC IMMUNITY^{Note 6}: 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 (except for 9~18Vin)

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

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 (A:12Vdc , B:24Vdc) , 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-120B-12 Block Diagram — Block Diagram

DDR-120B-12 Derating Curve — Derating Curve

DDR-120B-12 Input Under-Voltage Protection — Input Under-Voltage Protection

DDR-120B-12 Inrush Current — Inrush Current

DDR-120B-12 Efficiency vs Load & Vin Curve — Efficiency vs Load & Vin Curve

DDR-120B-12 D D R - 1 2 0 series — D D R - 1 2 0 series

DDR-120B-12 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-120B-12 to power 12V surveillance cameras from a 24V DC distribution bus?

Yes. The DDR-120B-12 accepts 16.8–33.6V DC input and outputs 12V at up to 10A (120W), making it well suited for stepping down a 24V building DC bus to power multiple 12V IP cameras, DVRs, or access control devices in a DIN rail panel.

Is this converter appropriate for converting a 24V solar system to 12V for radio equipment?

The DDR-120B-12 accepts 16.8–33.6V input, which covers a typical 24V solar battery bank including charge-state voltage variations. With 120W (10A at 12V) of output capacity and 4KVdc isolation, it can cleanly power 12V two-way radios, repeaters, or communication gear at remote solar sites.

Can the DDR-120B-12 supply 12V to industrial HMI displays and embedded PCs in a factory panel?

Yes. At 120W and 10A output, the DDR-120B-12 has enough capacity for industrial displays and embedded computing platforms that run on 12V. Its 24V-nominal input range (16.8–33.6V) matches common factory DC bus voltages, and the DIN rail mounting fits standard industrial enclosures.

Will the DDR-120B-12 work in a freezer warehouse control cabinet?

The DDR-120B-12 is rated for an operating temperature of -40°C to +70°C (with derating at the upper end per the derating curve), so it can operate in freezer environments well below 0°C. It is rated for 5–95% RH non-condensing, so keep condensation and frost away from the unit.

How does the DDR-120B input range differ from the DDR-120A and DDR-120C?

The DDR-120A sub-series accepts 9–18V DC input, the DDR-120B accepts 16.8–33.6V, the DDR-120C accepts 33.6–67.2V, and the DDR-120D accepts 67.2–154V. The B-series is designed for 24V nominal DC bus systems. All DDR-120 models share the same 125.2 x 102.0 x 32.0 mm DIN rail form factor and are available in 12V, 24V, and 48V output variants.

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Model	Power	Voltage	Current	IP Rating
Mean Well DDR-120B-24 DC-DC Converter - 120W - 16.8~33.6V in 24V out 5A	120W	24V	5A	IP20	View
Mean Well DDR-120B-48 DC-DC Converter - 120W - 16.8~33.6V in 48V out 2.5A	120W	48V	2.5A	IP20	View

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Mean Well DDR-120B-12 DC-DC Converter - 120W - 16.8~33.6V in 12V out 10A

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