The MEAN WELL ERPF-400-24 is a 24 V, 16.7 A enclosed AC/DC power supply with a catalogue rated output of 400.8 W. Its aluminium case and semi-potted interior are designed against rain splash for LED signs and displays. Active PFC supports full-range input; output must be derated at low input voltage. Install it upright with the specified ventilation clearances.
Product Datasheet
Download MEAN WELL ERPF-400 Datasheet (PDF)
The ERPF-400 section is on PDF pages 23, 24, 25, 26. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output Ratings
| Full model |
ERPF-400-24 |
| Series |
ERPF-400 |
| Output voltage code |
24 V version |
| DC output voltage |
24 V |
| Rated output current |
16.7 A |
| Rated output power |
400.8 W |
| Output current range |
0-16.7 A |
| Output voltage adjustment |
21.6-26.4 V |
| Maximum ripple and noise |
150 mVp-p |
| Voltage tolerance |
±1.0% |
| Line regulation |
±0.5% |
| Load regulation |
±0.5% |
Keep the output within both its current and rated-power limits after voltage adjustment. Voltage tolerance includes set-up tolerance, line regulation and load regulation.
Input and Electrical Performance
| Input voltage |
90-264 VAC; 127-370 VDC |
| Input frequency |
47-63 Hz |
| Temporary surge-input withstand |
300 VAC for 5 seconds |
| Typical efficiency |
90% |
| Typical power factor |
≥0.98 at 115 VAC; ≥0.95 at 230 VAC |
| Typical AC input current |
3 A at 115 VAC; 2.5 A at 230 VAC |
| Typical inrush current |
Cold start: 45 A at 115 VAC; 90 A at 230 VAC |
| Leakage current |
<1 mA at 240 VAC |
| Set-up / rise time |
2000 / 100 ms at 230 VAC; 3000 / 100 ms at 115 VAC, full load |
| Typical hold-up time |
10 ms at 230 VAC and 115 VAC, full load |
Unless otherwise stated, specifications 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 terminated with parallel 0.1 µF and 47 µF capacitors.
Protection
| Short-circuit protection |
Constant-current limiting; automatic recovery after the fault is removed |
| Overload threshold |
105-135% of rated output power |
| Overload recovery |
Constant-current limiting; automatic recovery after the fault is removed |
| Overvoltage threshold |
27.6-32.4 V |
| Overvoltage recovery |
Output shutdown; reapply input power to recover |
| Overtemperature protection |
Output shutdown; automatic recovery after the temperature falls |
Cooling and Operating Limits
| Cooling |
Free-air convection; fanless |
| Working temperature |
-30 to +60°C, subject to derating |
| Temperature load curve, vertical orientation |
100% through 35°C; reduce linearly to 50% at 60°C |
| Input-voltage load curve, 60 Hz |
50% at 90 VAC to below 200 VAC; 100% at 200-264 VAC |
| Working humidity |
20-90% RH, non-condensing |
| Storage conditions |
-30 to +85°C; 10-95% RH |
| Temperature coefficient |
±0.1%/°C over 0-35°C |
| Vibration |
10-500 Hz, 3 G; 10 minutes/cycle, 60 minutes on each X/Y/Z axis |
Apply the temperature and input-voltage limits together. Full rated output is not available throughout the entire input and temperature ranges.
Mechanical Installation and Connections
| Overall dimensions, L × W × H |
220.4 × 130 × 48 mm |
| Case drawing |
230; dimensional tolerance ±1 mm |
| Installation orientation |
Upright and vertical; do not tilt forwards/backwards or lay flat |
| Ventilation clearance |
10 cm above, below, left and right; 5 cm on the ventilation-hole side |
| Input terminal pins |
1: AC/L; 2: AC/N; 3: FG / protective earth |
| DC output terminal pins |
4-6: +V; 7-9: -V |
| Mounting-slot detail |
Ø8 mm, as shown in the mechanical drawing |
| Adjustment and indication |
+V ADJ control and LED power-on indicator |
| Maximum terminal tightening torque |
8 kgf·cm |
Use the exact model drawing for terminal polarity and mounting; similar enclosures do not establish identical pin assignments. The rain-splash design is not a specification for immersion.
Safety and EMC
| Catalogue-approved safety standards |
UL 60950-1; IEC / BS EN / EN 62368-1; GB 4943.1; EAC TP TC 004; IS 13252 (Part 1) |
| Withstand voltage |
Input-output: 3 kVAC; input-FG: 2 kVAC; output-FG: 0.5 kVAC |
| Isolation resistance |
100 MΩ at 500 VDC, 25°C and 70% RH, between input-output, input-FG and output-FG |
| EMC emission |
BS EN / EN 55032 (CISPR 32), Class A; GB 17625.1; GB/T 9254.1; BS EN / EN 61000-3-2 and -3; EAC TP TC 020 |
| EMC immunity |
BS EN / EN 61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN / EN 55035; light-industry level; EAC TP TC 020 |
Verify the completed equipment and installation against applicable safety and EMC requirements.
The catalogue EMC test used a 450 × 450 × 1 mm metal plate. IS 13252 (Part 1) is listed only for the 12 V and 24 V versions.
Weight and Reliability
| Mass, catalogue PACKING reference per unit |
1100 g |
| Catalogue packing |
1.1 kg; 9 units / 11 kg / 0.63 CUFT |
| Minimum MTBF, Telcordia / MIL-HDBK-217F |
1981.2K / 233.4K hours |
| Manufacturer datasheet warranty reference |
3 years |
| Factory test |
100% full-load burn-in |
MTBF references are Telcordia SR-332 (Bellcore) and MIL-HDBK-217F at 25°C, respectively. The per-unit catalogue packing mass is a reference, not a measured shipping weight.
