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Mean Well DDRH-120-32 Ultra Wide Input DC-DC Converter, 120W 32V 3.75A

Name: Mean Well DDRH-120-32 Ultra Wide Input DC-DC Converter, 120W 32V 3.75A
Brand: Mean Well
SKU: DDRH-120-32
Price: 134.88 USD
Availability: InStock

$134.88 USD

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Model

120W 32V 240W 32V

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Overview

DDRH-120-32 is the 32V output model of this series: rated current 3.75A, rated power 120W, typical efficiency 90%.

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-120-32Specifications from the official datasheet (2026-03-31 edition)

OUTPUT

DC VOLTAGE: 32V
RATED CURRENT: 3.75A
CURRENT RANGE: 0 ~ 3.75A
RATED POWER: 120W
RIPPLE & NOISE (max.)^Note.2: 240mVp-p
VOLTAGE ADJ. RANGE: 30 ~ 36V
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±1.0%
EXTERNAL CAPACITANCE LOAD (Max.): 2000μF

INPUT

VOLTAGE RANGE^Note.4: 250 ~ 1500Vdc
EFFICIENCY (Typ.) 300Vdc: 90%
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: 40 ~ 48V 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-120-32 Block Diagram — Block Diagram

DDRH-120-32 Derating Curve — Derating Curve

DDRH-120-32 External FUSE wiring instruction — External FUSE wiring instruction

DDRH-120-32 Installation Instruction — Installation Instruction

Typical applications

Downloads

Datasheet1

DDRH-120-32 datasheetDDRH_120_spec_sheet.pdf · 2026-03-31 edition PDF Download

FAQ

Can the DDRH-120-32 supply power to 32V brushless DC motors or drives?

The DDRH-120-32 provides 32V at 3.75A (120W) and is suited for powering 32V BLDC motors, servo drives, or DC drives with loads within that current rating. Its DIN rail mount integrates directly into control cabinet builds.

Is the DDRH-120-32 suitable for use in railway or traction DC bus applications?

The DDRH-120-32 accepts 250–1500VDC input, which covers many high-voltage DC bus levels for 32V auxiliary loads. However, the datasheet lists no railway standards — its approvals are UL1741, CSA C22.2 No.107.1-16, IEC62109-1 and BS EN/EN62109-1 — so confirm suitability for railway use before specifying it.

Can I use the DDRH-120-32 to power 32V LED drivers or lighting in industrial enclosures?

The DDRH-120-32 can supply up to 3.75A at 32V from a high-voltage DC input, making it usable for driving 32V LED lighting systems or constant-voltage LED drivers rated within 120W. The output is also adjustable from 30V to 36V for fine-tuning.

What input voltages does the DDRH-120-32 accept?

The DDRH-120-32 accepts a 250–1500VDC input, with an under-voltage lockout at 200–230VDC (release at 230–245VDC). This suits applications drawing from high-voltage DC sources such as solar string outputs or battery banks; an external 4A/1500VDC fuse is required.

Can the DDRH-120-32 operate in cold outdoor environments?

Yes. The DDRH-120-32 has an operating temperature range of -40°C to +80°C (with derating at higher ambient temperatures per the derating curve), making it appropriate for outdoor enclosures, cold-climate installations, and industrial environments where temperature extremes are expected.

How does the DDRH-120-32 compare to the other DDRH-120 series models?

The DDRH-120 series offers four output voltages: 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 use the same 63mm DIN rail housing and accept 250–1500VDC input.

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