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Mean Well DDRH-120-24 Ultra Wide Input DC-DC Converter, 120W 24V 5A

250~1500VDC 6:1 ultra-wide input rangewithstand 1700Vdc surge input for 10 seconds63mm slim widthDC output voltage adjustable 24~29V

SKU DDRH-120-24

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Overview

DDRH-120-24 is the 24V output model of this series: rated current 5A, rated power 120W, typical efficiency 89%.

DDRH-120 series is a 250 ~ 1500Vdc high reliable ultra-high input DIN rail type DC-DC converter which can supply stable working voltage for the load. It is suitable to be mounted on TS-35/7.5 or 15 rails. Main features are as following: easy to install DIN rail type, narrow width(63mm) in slim design, -40~+80° C wide range operating temperature, 4KVac high isolation voltage, operation at 5000m altitude, high efficiency, low ripple & noise, complete protections and so on. DDRH-120 is compliant with UL1741 and BS EN/EN61000-6-2 standard regarding immunity for industrial environments. It is suitable for industrial automation, surveillance, telecommunication and can be widely deployed in the applications of new energy generation such as solar power, and windmill power generation, for instances, photovoltaic power systems, high voltage inverting , DC bus centralized application, ESS, charging pile, railway and so forth.

Features

250~ 1500Vdc 6:1 ultra-wide input range
Withstand 1700Vdc surge input for 10 seconds
63mm slim width
4KVac I/O high isolation(Reinforced isolation)
Protections: Short circuit / Overload / Over voltage / Over temperature DC input under voltage / DC input reverse polarity
Fanless design, cooling by free air convection
Can be installed on DIN rail TS-35/7.5 or 15
-40~+80°C ultra-wide operating temperature (＞+50°C derating)
Over voltage categoryⅡ
Operating altitude up to 5000 meters
DC OK relay contact
DC output voltage adjustable(12~15V, 24~29V, 30~36V, 48~58V)
Conformal coating
3 years warranty

Specifications

DDRH-120-24Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 24V
RATED CURRENT: 5A
CURRENT RANGE: 0 ~ 5A
RATED POWER: 120W
RIPPLE & NOISE (max.)^Note.2: 240mVp-p
VOLTAGE ADJ. RANGE: 24 ~ 29V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.5%
EXTERNAL CAPACITANCE LOAD (Max.): 2500μF

INPUT

VOLTAGE RANGE^Note.4: 250 ~ 1500Vdc
EFFICIENCY (Typ.) 300Vdc: 89%
EFFICIENCY (Typ.) 800Vdc: 90%
EFFICIENCY (Typ.) 1500Vdc: 86%
INRUSH CURRENT (max.): COLD START 300A /1500Vdc 200A/800Vdc 70A/250Vdc
EXTERNAL INPUT FUSE: 4A/1500VDC, required(Please refer to page 4 for more details)

PROTECTION

OVERLOAD: 105 ~ 135% rated output power Protection type : Hiccup mode when output voltage<55%, recovers automatically after condition is removed; Constant current limiting, recovers automatically after fault condition is removed within 55% ~ 100% rated output voltage
OVER VOLTAGE: 33 ~ 42V Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER TEMPERATURE: Protection type : Hiccup mode, recovers automatically after fault condition is removed
DC INPUT REVERSE POLARITY: By internal Bridge Diode, no damage, recovers automatically after fault condition removed
DC INPUT UNDER VOLTAGE LOCKOUT: Under voltage protection range:200 ~ 230Vdc , Under voltage release range:230 ~ 245Vdc

FUNCTION

DC OK SIGNAL: Relay contact rating(max.) : 30V / 1A resistive

ENVIRONMENT

WORKING TEMP.: -40 ~ +80℃ (Refer to "Derating Curve")
WORKING HUMIDITY: 20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +80℃, 10 ~ 95% RH non-condensing
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 50℃)
VIBRATION: Component: 10 ~ 500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes; Mounting clip: Compliance to IEC60068-2-6
OPERATING ALTITUDE^Note.5: 5000m
OVER VOLTAGE CATEGORY: OVCⅡ2000m; According to EN62109-1

SAFETY & EMC

SAFETY STANDARDS: UL1741, CSA C22.2 No.107.1-16 , IEC62109-1, BS EN/EN62109-1, EAC TP TC 004 approved
WITHSTAND VOLTAGE: I/P-O/P:4KVAC I/P-FG :3.75KVAC O/P-FG :2KVAC O/P-DC OK:0.5KVAC
ISOLATION RESISTANCE: I/P-O/P, 100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION: Parameter Standard Test Level

Conducted BS EN/EN55032(CISPR32) Class A
Radiated BS EN/EN55032(CISPR32) Class A
EMC IMMUNITY: BS EN/EN55035, BS EN/EN61000-6-2

Parameter Standard Test Level

ESD BS EN/EN61000-4-2 Level 3, 8KV air; Level 2, 4KV contact, criteria A
Radiated Susceptibility BS EN/EN61000-4-3 Level 3, 10V, criteria A
EFT/Burest BS EN/EN61000-4-4 Level 3, 2KV, criteria A
Surge BS EN/EN61000-4-5 Level 4, 2KV/Vin+ ~ Vin-, 4KV/Vin ~ FG, criteria A
Conducted BS EN/EN61000-4-6 Level 3, 10V, criteria A
Magnetic Field BS EN/EN61000-4-8 Level 4, 30A, criteria A

Parameter	Standard	Test Level
Conducted	BS EN/EN55032(CISPR32)	Class A
Radiated	BS EN/EN55032(CISPR32)	Class A

Parameter	Standard	Test Level
ESD	BS EN/EN61000-4-2	Level 3, 8KV air; Level 2, 4KV contact, criteria A
Radiated Susceptibility	BS EN/EN61000-4-3	Level 3, 10V, criteria A
EFT/Burest	BS EN/EN61000-4-4	Level 3, 2KV, criteria A
Surge	BS EN/EN61000-4-5	Level 4, 2KV/Vin+ ~ Vin-, 4KV/Vin ~ FG, criteria A
Conducted	BS EN/EN61000-4-6	Level 3, 10V, criteria A
Magnetic Field	BS EN/EN61000-4-8	Level 4, 30A, criteria A

OTHERS

MTBF: 257.2 Khrs min. MIL-HDBK-217F (25℃); 1596.3 Khrs min. Telcordia TR/SR-332 (Bellcore) (25℃)
DIMENSION: 63*125.2*115mm (W*H*D)
PACKING: 0.845Kg; 12pcs/12.6Kg/1.02CUFT

Test conditions and notes7

1. All parameters NOT specially mentioned are measured at 800Vdc input, 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. 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).
6. Installation clearances : 40mm on top, 20mm on the bottom, 5mm on the left and right side are recommended when loaded permanently with full power. In case the adjacent device is a heat source, 15mm clearance is recommended.
7. The power supply is considered a component which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets 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

DDRH-120-24 Block Diagram — Block Diagram

DDRH-120-24 Derating Curve — Derating Curve

DDRH-120-24 External FUSE wiring instruction — External FUSE wiring instruction

DDRH-120-24 Installation Instruction — Installation Instruction

Typical applications

Downloads

Datasheet1

DDRH-120-24 datasheetDDRH_120_spec_sheet.pdf · 2026-03-31 edition PDF Download

FAQ

Can the DDRH-120-24 power 24V PLCs and industrial automation equipment?

Yes. The DDRH-120-24 provides 24V at up to 5A (120W), which is the standard supply voltage for most PLCs, I/O modules, and industrial automation controllers. It mounts on a DIN rail and operates from 250–1500VDC input, suitable for systems connected to medium-voltage DC distribution buses.

Is the DDRH-120-24 appropriate for powering 24V actuators and solenoid valves in a machine control cabinet?

The DDRH-120-24 delivers 5A at 24V, providing up to 120W for 24V actuators, solenoid valves, or relay coils in machine control applications. Verify that the combined inrush and steady-state load remains within the 5A continuous rating.

Can I use the DDRH-120-24 to step down a 600V or 1000V DC bus to 24V for instrumentation?

Yes. The DDRH-120-24 accepts 250–1500VDC input, making it well suited for stepping down high-voltage DC bus rails — such as 600V or 1000V solar or other DC buses — to 24V for instrumentation and control circuits. An external 4A/1500VDC input fuse is required.

What operating temperature range does the DDRH-120-24 support?

The DDRH-120-24 operates from -40°C to +80°C, covering both arctic cold and high-ambient industrial environments. Output must be derated at higher ambient temperatures according to the derating curve in the datasheet.

What mounting form factor does the DDRH-120-24 use, and how wide is it?

The DDRH-120-24 is a DIN rail-mount converter measuring 63 × 125.2 × 115 mm with a 63mm slim width. It fits TS35/7.5 or TS35/15 DIN rail and weighs 0.845 kg.

Can the output voltage of the DDRH-120-24 be trimmed above 24V?

Yes, the output voltage is adjustable from 24V up to 29V using the built-in trim function. This allows the output to be set precisely for loads with higher forward voltage requirements or to account for cable voltage drop.

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