The MEAN WELL DDRH-120-32 is a 250–1500 VDC input DIN rail DC/DC converter with a 32 V, 3.75 A output rated at 120 W. Its 63 mm-wide enclosure uses fanless convection cooling and mounts on TS-35/7.5 or TS-35/15 rail. Adjustable output, 4 kVAC reinforced input-to-output isolation and DC OK relay monitoring support high-voltage DC bus, renewable-energy and industrial-control installations within the specified operating limits.
Product Datasheet
Download MEAN WELL DDRH-120 Datasheet (PDF)
The DDRH-120 section is on PDF pages 29, 30, 31, 32, 33. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output Ratings
| Full model |
DDRH-120-32 |
| Series |
DDRH-120 |
| Output code |
32: 32 VDC nominal output |
| DC output voltage |
32 V |
| Rated output current |
3.75 A |
| Rated output power |
120 W |
| Output current range |
0–3.75 A |
| Output voltage adjustment |
30–36 V |
| Maximum ripple and noise |
240 mVp-p |
| Voltage tolerance |
±1.0% |
| Line regulation |
±0.5% |
| Load regulation |
±1.0% |
| Maximum external capacitive load |
2000 µF |
The complete model determines the output rating. Use the model-specific voltage, current and power values when selecting the load.
DC Input and Performance
| Specified DC input range |
250–1500 VDC |
| Input-range ratio |
6:1 |
| Typical efficiency |
90% at 300 VDC; 91% at 800 VDC; 87% at 1500 VDC |
| Maximum cold-start inrush current |
300 A at 1500 VDC; 200 A at 800 VDC; 70 A at 250 VDC |
| Block-diagram switching frequency |
65 kHz |
| Transient input withstand |
1700 VDC for 10 seconds; specified continuous input remains 250–1500 VDC |
Unless otherwise specified, catalogue measurements use 800 VDC input, rated load and 25°C ambient. The efficiency figures are typical values at the stated input voltages.
Ripple and noise are measured at 20 MHz bandwidth with a 12-inch twisted pair terminated by 0.1 µF and 47 µF capacitors in parallel. Voltage tolerance includes set-up tolerance, line regulation and load regulation.
Protection
| Short-circuit protection |
Included |
| Overload threshold |
105–135% of rated output power |
| Overload modes |
Hiccup below 55% of rated output voltage; constant-current limiting within 55–100%; automatic recovery after the fault is removed |
| Overvoltage threshold |
40–48 V |
| Overvoltage recovery |
Hiccup; automatic recovery after the fault is removed |
| Overtemperature protection |
Hiccup; automatic recovery after the fault is removed |
| Input reverse-polarity protection |
Internal bridge diode; automatic recovery after incorrect polarity is removed |
| Input undervoltage lockout |
Protection at 200–230 VDC; release at 230–245 VDC |
DC OK Monitoring
| Maximum relay contact rating |
30 V / 1 A, resistive load |
| Contact closed |
Converter ON / DC OK |
| Contact open |
Converter OFF / DC fail |
Use the isolated relay contact within its stated resistive-load rating.
Cooling, Derating and Environment
| Cooling and orientation |
Fanless free-air convection; vertical DIN rail mounting |
| Working temperature |
−40 to +80°C, with derating |
| Working humidity |
20–90% RH, non-condensing |
| Storage temperature and humidity |
−40 to +80°C; 10–95% RH, non-condensing |
| Temperature coefficient |
±0.03%/°C from 0 to 50°C |
| Maximum operating altitude |
5000 m, subject to derating |
| Altitude temperature adjustment |
Reduce permitted ambient temperature by 3.5°C per 1000 m above 2000 m |
| Component vibration test |
10–500 Hz, 2 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis |
| Mounting-clip vibration reference |
IEC 60068-2-6 |
| Thermal loading curve |
50% at −40°C; 100% from 0 to +50°C; 50% at +65°C; 15% at +80°C. Follow the complete curve between these points. |
| Input-voltage loading curve |
40% at 250 VDC; 80% at 300 VDC; 100% from 320 to 1400 VDC; 80% at 1500 VDC |
| Altitude load factor |
100% through 2000 m, decreasing linearly to 60% at 5000 m; multiply by the regular power-limit factor |
Apply the input-voltage, temperature and altitude limits together. The maximum ambient temperature is not a full-load rating. Refer to the complete curves on PDF page 31 before choosing continuous load.
Dimensions and Installation
| Dimensions, W × H × D |
63 × 125.2 × 115 mm |
| Mechanical case |
979; drawing tolerance ±1 mm |
| Compatible mounting rails |
TS-35/7.5 or TS-35/15; rail not included |
| Output adjustment |
Front-panel +V ADJ control; use the voltage range listed for this model |
| Installation clearances |
40 mm above, 20 mm below and 5 mm on each side for permanent full-load operation; use 15 mm beside an adjacent heat source |
| Input terminal blocks TB1 and TB2 |
Pins 1 and 2: −Vin; pins 3 and 4: +Vin |
| Output terminal block TB3 |
Pins 1 and 2: DC OK relay; pins 3 and 4: −Vo; pins 5 and 6: +Vo |
| Construction |
Conformal coating |
Follow the terminal labels and mechanical drawing on PDF page 32. Keep the convection path clear and use the specified external input fuse.
Required Input Fuse and Matching Parts
| External input fuse requirement |
4 A / 1500 VDC |
| Suggested fuse brand |
WalterFuse |
| Fuse manufacturer part number |
WJ30-4 |
| Fuse-holder manufacturer part number |
WJ30-H |
| MEAN WELL catalogue order code for fuse + holder |
WJ30-4_WJ30-H |
The catalogue specifies an external input fuse and shows the fuse holder in the +Vin supply line. WJ30-4_WJ30-H is the listed combination ordering code; WJ30-4 and WJ30-H identify its fuse and holder. Arrange these external parts separately; they are not stated as included with this converter.
Isolation and Standards
| Input-to-output withstand voltage |
4 kVAC; reinforced isolation |
| Output-to-DC OK withstand voltage |
0.5 kVAC |
| Insulation resistance |
Input–output: 100 MΩ at 500 VDC, 25°C and 70% RH |
| Catalogue-listed safety approvals |
UL 1741; CSA C22.2 No. 107.1-16; IEC 62109-1; BS EN / EN 62109-1; EAC TP TC 004 |
| Overvoltage category |
II at 2000 m, according to EN 62109-1; operating-altitude limits and derating are listed separately |
| EMC emission |
BS EN / EN 55032 (CISPR 32), Class A conducted and radiated emissions |
| EMC immunity |
BS EN / EN 55035 and BS EN / EN 61000-6-2; listed tests use performance criterion A |
| Input-to-FG withstand voltage |
3.75 kVAC |
| Output-to-FG withstand voltage |
2 kVAC |
This converter is a component for installation in final equipment. The completed equipment must be checked again for compliance with the applicable EMC requirements.
Mass and Catalogue References
| Mass, catalogue PACKING reference per unit |
845 g |
| Catalogue packing |
0.845 kg; 12 units / 12.6 kg / 1.02 CUFT |
| Minimum MTBF |
257.2K hours, MIL-HDBK-217F; 1596.3K hours, Telcordia TR/SR-332 (Bellcore); both at 25°C |
| Catalogue warranty |
3 years |
Mass is the single-unit reference from the catalogue PACKING field. It is not a measured shipment weight.
