MEAN WELL OWA-120U-42 is a moistureproof AC/DC LED power supply with 42 VDC, 2.9 A and 121.8 W rated output. It supports constant-voltage and constant-current operation within the specified LED operating region. This U version uses a NEMA 1-15P AC plug and 90–264 VAC input. The IP67 rating is for the power body; connector protection must suit the installation.
Download MEAN WELL OWA-120U Datasheet (PDF)Download MEAN WELL Installation Manual (PDF)Download MEAN WELL DC Plug Converter Guide (PDF)Catalog location: PDF pages 22–26; specification table on page 23, curves on page 24, and connection drawing on page 26.
Model and output
| Parameter |
Specification |
| Model and code |
OWA-120U-42 — OWA-120U; U identifies the US AC plug version; 42 identifies the nominal DC output voltage. |
| Output mode |
Constant-voltage + constant-current external AC/DC LED power supply. |
| Rated output voltage |
42 VDC |
| Rated output current |
2.9 A |
| Rated output power |
121.8 W (catalog rating) |
| Constant-current region |
25.2–42 VDC. Use the specified constant-current region for direct LED operation; select an LED string within this voltage window and observe the current limit. |
| Maximum ripple and noise |
250 mVp-p; measured at 20 MHz bandwidth with a 12-inch twisted pair and parallel 0.1 μF / 47 μF capacitors. |
| Voltage tolerance |
±1%; includes initial setup tolerance, line regulation and load regulation. |
| Line and load regulation |
Line: ±0.5%; load: ±0.5%. |
Input and electrical performance
| Parameter |
Specification |
| Input voltage |
90–264 VAC or 127–370 VDC. For DC operation, verify the manufacturer’s connection instructions and appropriate input connection for the delivered model. |
| Input frequency |
47–63 Hz |
| Typical efficiency |
89.5% at 115 VAC; 90.5% at 230 VAC. |
| Typical power factor |
Built-in active PFC; >0.97 at 115 VAC; >0.96 at 230 VAC at full load. |
| THD |
<20% at load ≥60%, 115 or 230 VAC. |
| Typical AC input current |
1.3 A at 115 VAC; 0.65 A at 230 VAC |
| Setup and rise time |
Setup 500 ms / rise 80 ms at 95% load, 115 or 230 VAC. Setup time is measured at cold first start; turning the power supply ON/OFF may increase setup time. |
| Typical hold-up time |
16 ms at full load, 115 or 230 VAC. |
| Typical inrush current |
Cold start: 30 A at 115 VAC; 60 A at 230 VAC; both 520 μs width at 50% peak current. |
| Leakage current |
<0.125 mA at 120 VAC; <0.25 mA at 240 VAC. |
| No-load consumption |
<0.15 W |
| Circuit-breaker reference |
4 / 6 units on type B / type C 16 A circuit breakers at 230 VAC, respectively; verify the actual breaker and installation conditions. |
Protection and operating conditions
| Parameter |
Specification |
| Overcurrent protection |
95–108%; constant-current limiting, automatically recovers after the fault is removed. |
| Short-circuit protection |
Hiccup mode, automatically recovers after the fault is removed. |
| Overvoltage protection |
46–54 V; output shuts down. Remove the fault and re-power to recover. |
| Overtemperature protection |
Output shuts down. Remove the overtemperature condition and re-power to recover. |
| Ambient temperature |
−40 to +70°C, subject to derating. Operation from −40 to −25°C is specified only at 230 VAC. |
| Cooling and load derating |
Fanless free-air convection with the recommended horizontal mounting. 100% load through +45°C, decreasing to 50% at +70°C. Apply thermal and input/load limits together; the upper ambient limit is not a full-load rating. |
| Input/load curve |
At 60 Hz: 80% load at 90 VAC, rising to 100% at 100 VAC and remaining at 100% through 264 VAC. |
| Humidity and storage |
Working: 20–95% RH, non-condensing. Storage: −40 to +80°C, 10–95% RH. |
| Temperature coefficient |
±0.03%/°C over 0–50°C. |
| Vibration |
10–500 Hz, 5 G, 12 minutes per cycle, 72 minutes each along X, Y and Z axes. |
Safety and compliance
| Parameter |
Specification |
| Catalog safety and construction |
Class II power unit, no FG connection; fully silicone-potted plastic enclosure with 94V-0 flame-retardant housing. IP67 applies to the power body, not an unrestricted waterproof rating for plugs or the complete installation. UL8750 listed; CSA C22.2 No. 250.13-12. Suitable for dry and damp locations as catalogued. |
| Energy-efficiency declarations |
Energy efficiency Level VI; EISA 2007 / DoE and NRCan requirements are stated in the catalog. |
| EMC emissions |
FCC Part 15. |
| Insulation |
Input-to-output withstand voltage: 3.75 kVAC. Input-to-output isolation resistance: 100 MΩ at 500 VDC / 25°C / 70% RH. |
Connections and installation
| Parameter |
Specification |
| Dimensions and mounting |
191 × 63 × 37.5 mm (L × W × H); case PWM-120, drawing tolerance ±1 mm; two Ø4.5 mm mounting holes. Follow the recommended horizontal mounting and dimensioned drawing. Retain the supplied cable/ferrite arrangement where fitted. |
| AC connection |
NEMA 1-15P male; SVT 18 AWG × 2 conductors, 1500 ±20 mm. |
| DC connection |
Standard locking 4-pin power DIN, KYCON KPPX-4P or equivalent: pins 1 and 4 positive; pins 2 and 3 negative. UL2464 18 AWG × 4 conductors, 300 ±20 mm. Use the numbered connector drawing to identify pins. |
| Catalog packing reference |
1.15 kg per unit (1150 g); this is the catalog PACKING reference, not a measured net weight or a shipping-parcel weight. |
| MTBF |
2902.2 / 294.4 thousand hours minimum, Telcordia SR-332 / MIL-HDBK-217F at 25°C, respectively. |
Disconnect AC power before connecting the DC plug, installing, cleaning or servicing, and prevent accidental reconnection. Check voltage, polarity, connector size and current rating before use; never force an incompatible plug. Keep connections secure and protect cables from damage. Provide ventilation and leave 10–15 cm clearance when an adjacent device is a heat source; do not stack objects on the unit. Follow the catalog’s horizontal mounting and load curves; nonstandard mounting or high ambient temperature may require additional derating. Keep plugs and connections appropriately protected; do not immerse the unit in water. Do not open the enclosure. Damaged external cables must be replaced by the manufacturer, a service agent or similarly qualified personnel. Verify insulation, interconnections and EMC in the final equipment.
Separate plug converters
The DC plug guide lists separately sold DC PLUG-R7BF-P1J (2.1 mm ID × 5.5 mm OD × 11 mm barrel) and DC PLUG-R7BF-P1M (2.5 mm ID × 5.5 mm OD × 11 mm barrel) for the standard OWA-90U–200U R7B interface. Verify mating, polarity and current compatibility for the actual output before use; a converter must not be assumed to carry the full rated current of every model.
Specification notes
Unless otherwise specified, catalog parameters are measured at 230 VAC input, rated load and 25°C ambient. Typical efficiency, power factor and time values depend on operating conditions; protection thresholds do not authorize continuous overload. The manufacturer catalog states a 5-year warranty; applicable manufacturer terms govern.
