MEAN WELL OWA-120U-42 supplies 42 V DC at 2.9 A, with a rated output of 121.8 W. This Class II, fanless LED power supply uses a North American AC plug and a locking DIN four-pin DC connector. Its fully potted power body is rated IP67; the DC connector is outside that rating. Observe the input and temperature derating limits.
Product Datasheet
Download MEAN WELL OWA-120U Datasheet (PDF)
The OWA-120U section is on PDF pages 22, 23, 24, 25, 26. Refer to the complete mechanical drawings and notes when planning installation.
Model and intended use
| Complete model |
OWA-120U-42 |
| Series / regional version |
OWA-120U; North American plug version. |
| Output code |
42 identifies the nominal 42 V DC output. |
| Intended applications |
Indoor LED lighting, decorative or office lighting and general electronic devices requiring a moistureproof power body. |
Output performance
| Rated output voltage |
42 V DC |
| Rated output current |
2.9 A |
| Rated output power |
121.8 W |
| Ripple and noise |
250 mVp-p maximum; measured with the test arrangement stated below. |
| Voltage tolerance |
±1.0% |
| Line / load regulation |
±0.5% / ±0.5% |
| Constant-current region |
25.2–42 V; this is an output-voltage region, not an adjustable current setting. |
| Set-up / rise time |
500 / 80 ms at 95% load, 230 / 115 VAC. |
| Hold-up time |
16 ms typical at full load, 230 / 115 VAC. |
| Typical efficiency |
89.5% at 115 VAC; 90.5% at 230 VAC. |
| No-load consumption |
Less than 0.15 W; efficiency Level VI. |
Input and efficiency
| AC / DC input range |
90–264 VAC / 127–370 VDC. |
| AC frequency |
47–63 Hz |
| Power factor |
Active PFC; typical PF >0.97 at 115 VAC and >0.96 at 230 VAC, full load. |
| Typical AC current |
1.3 A at 115 VAC; 0.65 A at 230 VAC. |
| Typical inrush current |
Cold start: 30 A at 115 VAC; 60 A at 230 VAC. Pulse width 520 µs measured at 50% of peak current. |
| Leakage current |
<0.125 mA at 120 VAC; <0.25 mA at 240 VAC. |
| Total harmonic distortion |
THD <20% at output loading ≥60%, 115 / 230 VAC. |
| 16 A circuit-breaker limit |
At 230 VAC: up to 4 supplies on type B, or 6 supplies on type C. |
LED operating modes
The output characteristic distinguishes constant-voltage operation with an LED driver, constant-current operation for direct drive, and a hiccup region below the specified 25.2 V minimum of the constant-current region.
The maximum operating voltage in constant-current mode depends on the end-system configuration. Confirm LED compatibility with the manufacturer before direct-drive operation.
The power-factor graph is for constant-current operation. The efficiency-versus-load illustration uses the 48 V model; use this model's specified typical efficiency for selection.
Protection
| Over-current protection |
95–108%; constant-current limiting, automatic recovery after the fault is removed. |
| Short-circuit protection |
Hiccup mode; automatic recovery after the fault is removed. |
| Over-voltage protection |
46–54 V; output shuts down. Re-power the supply to recover. |
| Over-temperature protection |
Output shuts down. Re-power the supply to recover. |
Environment and derating
| Operating temperature / cooling |
−40 to +70°C, subject to derating; free-air convection with horizontal mounting. |
| Ambient-temperature derating |
At horizontal mounting, the 20–54 V curve permits 100% load through 45°C, falling to 50% at 70°C. The −40 to −25°C region is marked for 230 VAC input only. |
| Input-voltage derating |
At 60 Hz: 90 VAC corresponds to 80% load; 100–264 VAC permits 100%. Apply temperature derating as well. |
| Working humidity |
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, 5G, 12 minutes per cycle; 72 minutes on each X, Y and Z axis. |
Insulation, protection and compliance
| Electrical construction |
Class II, with no FG connection; fully potted silicone in a plastic enclosure. The enclosure material is described as 94V-0 flame retardant. |
| Body protection |
IP67 applies to the power body, excluding DC connectors. Use a connection assembly suitable for the installation environment. |
| Withstand voltage |
Input to output: 3.75 kVAC. |
| Insulation resistance |
Input to output: 100 MΩ at 500 VDC, 25°C and 70% RH. |
| Catalogue-listed safety |
UL8750 listed; CSA C22.2 No. 250.13-12. The UL-listed supply is suitable for dry and damp locations. |
| EMC emissions |
Compliance with FCC Part 15. |
| Energy-efficiency references |
Level VI; EISA 2007 / DoE and Canada NRCan references are listed for this series. |
Dimensions, leads and installation
| Body dimensions |
191 × 63 × 37.5 mm (L × W × H); case PWM-120, general drawing tolerance ±1 mm. |
| Mounting |
Horizontal mounting; two Ø4.5 mm mounting holes. Use the complete drawing for positions and clearances. |
| AC connection |
North American NEMA 1-15P male plug; SVT 18AWG × 2C; 1500±20 mm. |
| DC lead |
UL2464 18AWG × 4C; 300±20 mm. |
| Standard DC connector |
Locking power DIN 4 pins; KYCON KPPX-4P or equivalent. |
| DC polarity / pin assignment |
Pins 1 and 4: +V; pins 2 and 3: −V. |
| Catalogue packing reference per unit |
1150 g (1.15 kg), from the manufacturer's PACKING entry; not a measured net or shipping-parcel weight. |
Check the connector view and pin numbering in the mechanical drawing before wiring. The marked Tcase point identifies the case-temperature measurement location. Keep the connection and installation conditions within the complete system's requirements.
Optional connections
The series catalogue refers to separately purchased DC plug adapters. Specify a compatible connection to the standard locking DIN four-pin output, the required polarity, and a complete cable/connector assembly rated for the intended voltage and current. Confirm the adapter part number and compatibility when ordering; the standard output connector remains as stated above.
Reliability and measurement notes
| MTBF reference |
2902.2 thousand hours minimum, Telcordia SR-332 (Bellcore); 294.4 thousand hours minimum, MIL-HDBK-217F at 25°C. |
| Catalogue warranty |
The manufacturer's series datasheet lists a 5-year warranty; its terms and applicability govern. |
| Catalogue version |
2024-10-16 |
Unless otherwise specified, parameters are measured at 230 VAC input, rated load and 25°C ambient.
Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted-pair wire terminated with 0.1 µF and 47 µF capacitors in parallel.
Voltage tolerance includes set-up tolerance, line regulation and load regulation. Set-up time is measured at a cold first start; repeated ON/OFF operation may increase set-up time.
Apply all temperature, input-voltage, output and connector limits together. Integration, wiring and the final equipment's compliance must be checked for the intended installation.
