MEAN WELL ENP-120-48 is a fanless ENP-120 desktop AC/DC power supply for land mobile radio, surveillance and TV antenna equipment. It provides 55.2 V DC, 2.2 A rated current and 121 W rated output power. Peak output is limited to 2.75 A and 151.8 W for up to 3 seconds; input-voltage and temperature derating apply.
Product Datasheet
Download MEAN WELL ENP-120 Datasheet (PDF)
The ENP-120 section is on PDF pages 1, 2, 3, 4. Refer to the complete mechanical drawings and notes when planning installation.
Model-Specific DC Output
| Complete model |
ENP-120-48; 48 is the nominal-voltage model code. |
| DC output voltage |
55.2 V. |
| Rated output current |
2.2 A; rated-load current range 0–2.2 A. |
| Rated output power |
121 W for this exact model, subject to input and temperature derating. |
| Peak output current / power |
2.75 A / 151.8 W, for up to 3 seconds. |
| Voltage adjustment range |
47.5–58.8 V using the rear adjustment control. |
| Ripple and noise, maximum |
350 mVp-p under the stated measurement conditions. |
| Voltage tolerance |
±1.0%; includes set-up tolerance, line regulation and load regulation. |
| Line regulation |
±0.5%; low line to high line at rated load. |
| Load regulation |
±0.5%; measured from 0% to 100% rated load. |
| Typical efficiency |
91.5% under the default specification test conditions. |
The series provides 125% peak-load capability, with the exact model’s peak current and power shown above. Limit peak operation to 3 seconds and observe both current and power limits. The adjustable voltage range does not increase the rated current or available continuous power.
Input, Timing and Efficiency
| Input voltage / frequency |
90–264 VAC or 127–370 VDC; AC frequency 47–63 Hz. |
| AC inlet / grounding |
Three-contact AC inlet is shown at the rear. The block diagram identifies a frame-ground (FG) connection. |
| Power-factor correction |
Built-in active PFC; typical PF >0.98 at 115 VAC and >0.95 at 230 VAC, at full load. |
| Typical AC input current |
1.25 A at 115 VAC; 0.63 A at 230 VAC. |
| Typical cold-start inrush |
65 A at 230 VAC. |
| Leakage current |
Less than 3.5 mA at 240 VAC. |
| No-load power consumption |
Less than 0.15 W. |
| Set-up / rise time |
1000 / 100 ms at full load. Set-up time is measured at a cold first start; rapid switching OFF and ON may increase it. |
| Typical hold-up time |
20 ms at full load. |
| Catalogue energy-efficiency statements |
Level VI; the catalogue states compliance with EISA 2007/DoE, NRCan and EU ErP. |
Protection Functions
| Short circuit |
Constant-current limiting; automatic recovery after the fault is removed. |
| Overload, 110–125% of rated power |
If the peak-load condition continues beyond 3 seconds, the supply switches to constant-current limiting; automatic recovery after that load condition is removed. |
| Overload above 125% of rated power |
Constant-current limiting, with automatic recovery after the overload is removed. |
| Overvoltage |
62.1–72.9 V; output shutdown, followed by re-powering to recover. |
| Overtemperature |
Output shutdown; automatic recovery after temperature decreases. |
Protection operation does not extend the 3-second peak rating or the permitted continuous load.
Cooling, Environment and Derating
| Cooling / orientation |
Fanless free-air convection; the load-temperature curve is specified for horizontal installation. Keep ventilation openings and the surrounding air path unobstructed. |
| Working temperature |
-30°C to +70°C, with load derating. |
| Horizontal thermal curve |
100% rated load from -30°C to +50°C; reduce along the plotted line to 60% at +70°C. |
| Input-voltage load curve |
At 60 Hz: 90% load at 90 VAC, rising to 100% at 100 VAC and remaining at 100% through 264 VAC, before temperature derating. |
| Above 2000 m |
For this fanless model, reduce the permissible ambient temperature by 3.5°C per additional 1000 m, as directed by the altitude note. |
| Working humidity |
20–95% RH, non-condensing. |
| Storage temperature / humidity |
-40°C to +85°C; 10–95% RH, non-condensing. |
| Temperature coefficient |
±0.05%/°C from 0°C to +50°C. |
| Vibration |
10–500 Hz, 2 G; 10-minute cycle, 60 minutes each along X, Y and Z. |
Apply the input-voltage and ambient-temperature limits together. The stated temperature range is not a full-load rating at every temperature.
Dimensions, Wiring and Installation
| Body dimensions, L × W × H |
192 × 178 × 45.5 mm; case 252A. The width corresponds to the 7-inch format used in land mobile radio equipment. |
| Mechanical layout |
See physical catalogue page 4. Dimensions are in mm with ±1 mm drawing tolerance; the side view separately marks a 4.3 mm foot projection. |
| Front and rear controls |
Front power switch and LED indicator; rear AC inlet, TB1 DC terminals and VR output-voltage adjustment. |
| TB1 DC output terminals |
Pins 1 and 2: +V; pins 3 and 4: −V. These are duplicate connections for the same single DC output. |
| Connection wire size |
0.5–4.0 mm² cross-section; the catalogue gives 12–20 AWG. |
| Wire preparation / terminal torque |
Recommended strip length: 9 mm. Screw torque: 4.0 lb-in (0.4–0.5 N·m). |
| Catalogue unit packing reference |
980 g per unit; carton quantities and carton mass are separate packing information. |
Select suitable mains and load wiring for the actual installation. These ENP pages do not specify a separately orderable connector kit, bracket or power-cord part number, or identify a supplied external cable set; confirm the required external parts when ordering.
Safety, EMC and Reliability
| Safety standards listed |
The catalogue lists IEC 62368-1, UL 62368-1 and EAC TP TC 004 as approved, and compliance with BS EN/EN 62368-1. |
| Dielectric withstand |
Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC. |
| Insulation resistance |
100 MΩ for input–output, input–FG and output–FG, at 500 VDC, 25°C and 70% RH. |
| Conducted / radiated emission |
Class B to BS EN/EN 55032 (CISPR 32) and FCC Part 15 (CISPR 22), as listed in the catalogue. |
| Harmonics / flicker |
BS EN/EN 61000-3-2 / BS EN/EN 61000-3-3. |
| Immunity standards listed |
BS EN/EN 55024. |
| ESD / radiated RF |
EN 61000-4-2: 8 kV air, level 3; 4 kV contact, level 2. EN 61000-4-3: 3 V/m, level 2. |
| EFT / surge |
EN 61000-4-4: 1 kV, level 2. EN 61000-4-5: 1 kV line–line, level 2; 2 kV line–earth, level 3. |
| Conducted RF / magnetic field |
EN 61000-4-6: 3 Vrms, level 2. EN 61000-4-8: 1 A/m, level 1. |
| Voltage dips / interruptions |
EN 61000-4-11: >95% dip for 0.5 period, 30% dip for 25 periods, and >95% interruption for 250 periods. |
| MTBF references |
1997.9 thousand hours minimum, Telcordia SR-332 (Bellcore); 257.1 thousand hours minimum, MIL-HDBK-217F at 25°C. |
| Catalogue warranty |
3 years. |
These are the 2026-03-31 catalogue statements for the specified power supply. Confirm that the completed equipment and its actual installation meet the applicable EMC requirements.
Measurement Conditions
Unless otherwise stated, parameters are measured at 230 VAC input, rated load and 25°C ambient. Ripple and noise use 20 MHz bandwidth with a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors.
