Mean Well DDR-120B-24 DC-DC Converter - 120W - 16.8~33.6V in 24V out | New Zealand Distributor

Overview

DDR-120B-24 is the 24V output model of this series: rated current 5A, 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 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-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 @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.): 89.5%
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: 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: 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-24 Block Diagram — Block Diagram

DDR-120B-24 Derating Curve — Derating Curve

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

DDR-120B-24 Inrush Current — Inrush Current

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

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

DDR-120B-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-120B-24 to power 24V automation devices from a 24V battery-backed bus?

Yes. The DDR-120B-24 accepts 16.8–33.6V DC input and provides an isolated 24V output at up to 5A (120W). This is useful when you need galvanic isolation between a 24V UPS or battery bus and sensitive 24V PLC, relay, or sensor circuits to prevent ground loops and noise coupling.

Is the DDR-120B-24 suitable for powering 24V actuators and valve controllers in process plants?

The DDR-120B-24 delivers 24V at 5A (120W) with 4KVdc isolation from a 16.8–33.6V input bus. This capacity handles most individual actuator or valve controller loads. The -40°C to +70°C operating range (with derating per the derating curve) suits harsh plant environments.

Can I use this converter to create an isolated 24V supply for a DIN rail data acquisition system?

The DDR-120B-24 is well suited for this. Its 4KVdc input-to-output isolation prevents noise from the main DC bus from reaching sensitive analog measurement circuits. At 120W, it can power a data logger, signal conditioners, and several analog input modules simultaneously.

Does the DDR-120B-24 require derating at elevated temperatures inside a control cabinet?

Yes. The DDR-120B-24 is rated for operation from -40°C to +70°C, and like most power converters it derates output toward the upper end of that range. Derating may also be needed at low input voltage. Consult the derating curves in the datasheet before planning on the full 120W in a warm cabinet.

Is the DDR-120B-24 a good choice for powering 24V LED panel indicators from a 24V DC bus?

While it works for that purpose, the DDR-120B-24 provides 120W at 5A, which is significantly more than most LED indicator panels require. If your indicator load is only a few watts, a lower-wattage converter may be more cost-effective and space-efficient.

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Model	Power	Voltage	Current	IP Rating
Mean Well DDR-120B-48 DC-DC Converter - 120W - 16.8~33.6V in 48V out 2.5A	120W	48V	2.5A	IP20	View
Mean Well DDR-120B-12 DC-DC Converter - 120W - 16.8~33.6V in 12V out 10A	120W	12V	10A	IP20	View

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Mean Well DDR-120B-24 DC-DC Converter - 120W - 16.8~33.6V in 24V out 5A

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Overview

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Specifications

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INPUT

PROTECTION

ENVIRONMENT

SAFETY & EMC

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Technical drawings

Typical applications

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Certificates2

Catalogues2

FAQ

Payment & Security

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Mean Well DDR-120B-24 DC-DC Converter - 120W - 16.8~33.6V in 24V out 5A

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