Image shown is a representation only. Exact specifications should be obtained from the product datasheet.

Mean Well DDR-120C-12 DC-DC Converter - 120W - 33.6~67.2V in 12V out 10A

Name: Mean Well DDR-120C-12 DC-DC Converter - 120W - 33.6~67.2V in 12V out 10A
Brand: Mean Well
SKU: DDR-120C-12
Price: 68.88 USD
Availability: InStock

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

SKU DDR-120C-12

$68.88 USD

Shipping calculated at checkout.

Select model — 8 in this family

DDR-120C-12

DDR-120C-12 12V out 120W In stock $68.88 USD

DDR-480C-12 12V out 400W Low stock $184.66 USD

DDR-120C-24 24V out 120W In stock $61.10 USD

DDR-240C-24 24V out 240W In stock $97.43 USD

DDR-480C-24 24V out 480W Low stock $184.66 USD

DDR-120C-48 48V out 120W Low stock $68.88 USD

DDR-240C-48 48V out 240W In stock $97.43 USD

DDR-480C-48 48V out 480W Low stock $184.66 USD

Product variants

Notify me when it's back in stock

Your order will be processed within 24 hours

Overview

DDR-120C-12 is the 12V output model of this series: rated current 10A, rated power 120W, typical efficiency 89.5%.

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-120C-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 @48Vdc
HOLD UP TIME (Typ.): Please refer to page 7 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE^Note.4: 33.6 ~ 67.2Vdc
EFFICIENCY (Typ.): 89.5%
DC CURRENT (Typ.): 2.8A @48Vdc
INRUSH CURRENT (Typ.): 5A @48Vdc
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: 48Vin (C - type) :Power ON≥33.6V , OFF≤33V

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-120C-12 Block Diagram — Block Diagram

DDR-120C-12 Derating Curve — Derating Curve

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

DDR-120C-12 Inrush Current — Inrush Current

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

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

DDR-120C-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-120C-12 to step down a 48V DC bus to 12V for edge computing devices?

Yes. The DDR-120C-12 accepts 33.6–67.2V DC input, which covers standard 48V DC distribution systems. It outputs 12V at up to 10A (120W), providing enough power for edge servers, mini PCs, or embedded computing nodes mounted on DIN rail in a network or telecom cabinet.

Is the DDR-120C-12 suitable for powering 12V peripherals in a 48V data center rack?

The DDR-120C-12 is designed for exactly this type of DC-DC conversion. With a 33.6–67.2V input range around a nominal 48V bus, it delivers 12V at 10A for fans, sensors, BMC modules, or other 12V accessories. The 4KVdc input-to-output isolation keeps the 12V side separated from the bus.

Can this converter supply 12V to access control and intercom systems from a 48V building DC bus?

Yes. The DDR-120C-12 takes 33.6–67.2V input and produces 12V at up to 10A, which is more than sufficient for door controllers, card readers, intercoms, and electric strikes. The DIN rail form factor and 32mm width fit standard security panel enclosures.

How does the DDR-120C-12 differ from the DDR-120B-12 and DDR-120D-12?

All three output 12V at 10A (120W) and share the same physical dimensions. The key difference is input voltage range: the DDR-120B-12 accepts 16.8–33.6V (for 24V bus systems), the DDR-120C-12 accepts 33.6–67.2V (for 48V bus systems), and the DDR-120D-12 accepts 67.2–154V (for 110V DC bus systems). Choose the variant that matches your source DC bus voltage.

Will the DDR-120C-12 function reliably in an outdoor telecom cabinet with no climate control?

The DDR-120C-12 is rated for -40°C to +70°C operating temperature, with load derating at higher temperatures per the derating curve. The datasheet lists no IP rating, so for outdoor deployment mount it inside a weatherproof enclosure that shields it from rain and condensation (humidity rating 5-95% RH non-condensing).

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Model	Power	Voltage	Current	IP Rating	Price
Mean Well DDR-120C-48 DC-DC Converter - 120W - 33.6~67.2V in 48V out 2.5A	120W	48V	2.5A	IP20	$68.88	View
Mean Well DDR-120C-24 DC-DC Converter - 120W - 33.6~67.2V in 24V out 5A	120W	24V	5A	IP20	$61.10	View

Please log in to write a review.