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Mean Well DDRH-120-48 Ultra Wide Input DC-DC Converter, 120W 48V 2.5A

Name: Mean Well DDRH-120-48 Ultra Wide Input DC-DC Converter, 120W 48V 2.5A
Brand: Mean Well
SKU: DDRH-120-48
Price: 134.88 USD
Availability: InStock

250~1500VDC 6:1 ultra-wide input rangewithstand 1700Vdc surge input for 10 seconds63mm slim widthDC output voltage adjustable 48~58V

SKU DDRH-120-48

$134.88 USD

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Select model — 9 in this family

DDRH-120-48

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Product variants

Available to order

Overview

DDRH-120-48 is the 48V output model of this series: rated current 2.5A, rated power 120W, typical efficiency 91%.

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-120-48Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 48V
RATED CURRENT: 2.5A
CURRENT RANGE: 0 ~ 2.5A
RATED POWER: 120W
RIPPLE & NOISE (max.)^Note.2: 300mVp-p
VOLTAGE ADJ. RANGE: 48 ~ 58V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
EXTERNAL CAPACITANCE LOAD (Max.): 1000μF

INPUT

VOLTAGE RANGE^Note.4: 250 ~ 1500Vdc
EFFICIENCY (Typ.) 300Vdc: 91%
EFFICIENCY (Typ.) 800Vdc: 91%
EFFICIENCY (Typ.) 1500Vdc: 87%
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: 62 ~ 70V 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-120-48 Block Diagram — Block Diagram

DDRH-120-48 Derating Curve — Derating Curve

DDRH-120-48 External FUSE wiring instruction — External FUSE wiring instruction

DDRH-120-48 Installation Instruction — Installation Instruction

Typical applications

Downloads

Datasheet1

DDRH-120-48 datasheetDDRH_120_spec_sheet.pdf · 2026-03-31 edition PDF Download

FAQ

Can the DDRH-120-48 supply 48V DC to PoE switches or telecom equipment from a high-voltage DC bus?

Yes. The DDRH-120-48 provides 48V at 2.5A (120W) and accepts 250–1500VDC input, making it a good fit for stepping down high-voltage DC buses to the 48V rail used by telecom equipment, PoE switches, and VoIP gear in industrial or data center settings.

Is the DDRH-120-48 suitable for powering 48V servo drives or motor controllers?

The DDRH-120-48 delivers up to 2.5A at 48V (120W), which can power 48V servo drives and motor controllers within that power envelope. The output voltage is also adjustable from 48V to 58V via the trim function if a higher rail is needed.

Can I use the DDRH-120-48 in solar or battery storage systems where the bus voltage varies widely?

Yes. The wide 250–1500VDC input range and the input under-voltage lockout (200–230VDC) make the DDRH-120-48 well suited for solar string inverter housings or battery energy storage systems where bus voltage fluctuates significantly.

Does the DDRH-120-48 require any cooling fan?

The DDRH-120-48 datasheet does not list a cooling fan. For permanent full-power operation it recommends installation clearances of 40mm on top, 20mm below and 5mm on each side (15mm next to a heat source), and output must be derated at higher ambient temperatures per the derating curve.

What is the operating temperature range of the DDRH-120-48?

The DDRH-120-48 operates from -40°C to +80°C, with output derating at higher ambient temperatures per the derating curve, providing reliable performance in both low-temperature outdoor installations and high-ambient industrial enclosures.

How does the DDRH-120-48 differ from the other DDRH-120 models?

The DDRH-120 series has four variants: DDRH-120-12 (100.8W, 12V, 8.4A), DDRH-120-24 (120W, 24V, 5A), DDRH-120-32 (120W, 32V, 3.75A), and DDRH-120-48 (120W, 48V, 2.5A). All share the 63mm DIN rail housing and 250–1500VDC input range.

Is the output voltage of the DDRH-120-48 adjustable?

Yes, the output voltage is adjustable from 48V up to 58V using the built-in trim. This allows the converter to serve loads that require a voltage higher than the nominal 48V output.

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