The ERP-400F series is a rain-proof AC to DC single-output enclosed power supply, designed to regulate the output, using the international common AC input voltage range, with active power factor correction circuit, the whole series provides 12V,24V output. With a conversion efficiency of up to 91%, the fan-less design can operate in the case temperature range of -20°C to 60°C under natural air cooling.
Features :
200 ~ 240VAC AC input (can withstand 300VAC surge input for 5 seconds)
Stabilized mode output
Protection characteristics: short circuit/over load/over voltage/over temperature
Natural air cooling
Irrigated semi-rubber rain proof design
With power-on display (LED)
Suitable for dry, wet and rainy environment
100% full load burn test
High efficiency, long life and high reliability
2-year quality guarantee
Application:
LED lights with lighting
LED luminous subtitles
LED mobile sign
Industrial instruments and equipment
Engineered specifically for outdoor LED display screens, architectural lighting, and harsh industrial environments subject to extreme day-to-night temperature swings.
The Hwele 400W Semi-Potted Rainproof Power Supply delivers the ultimate balance between thermal performance, environmental protection, and bill-of-materials (BOM) cost efficiency. Unlike traditional unpotted outdoor power units that suffer from short-circuit risks caused by internal nighttime condensation (the “breathing effect”), this module features an automated split-level silicone encapsulation protocol.
By hermetically sealing sensitive control ICs and high-impedance PCB traces within a high-dielectric silicone layer, while allowing high-power transformers to vent heat directly through natural air convection, Hwele eliminates moisture downtime without compromising thermal derating headroom.
| Parameter Category | Technical Standard / Value |
|---|---|
| Rated Power Output | 400 Watts Continuous Output |
| Output Voltage Options | 5V / 12V / 24V / 36V / 48V DC (Adjustable ±10%) |
| Input Voltage Range | 176–264V AC / 90–132V AC Selected by Switch |
| Ingress Protection Level | Louvered Rainproof (IP23 / IP33) + Semi-Potted PCB |
| Moisture / Corrosion Defense | High-Dielectric Silicone Semi-Potting + Conformal Coating |
| Cooling Architecture | Free Air Convection (Fanless Louvered Aluminum Chassis) |
| Protection Features | Short Circuit / Overload / Over Voltage / Over Temperature |
| Operating Temperature Range | -30°C to +60°C (Refer to output derating curve) |
| Compliance & Certifications | CE, ROHS, ISO9001 Factory Audit Approved |
Want to understand how semi-potting solves daytime condensation? Read our deep-dive technical paper: The Physics of Condensation: Why Semi-Potted Rainproof Supplies Excel in Day-to-Night Temperature Fluctuation →
Zhejiang Hengwei Technology Co., Ltd. operates an automated 6,000m² manufacturing facility equipped with robotic silicone potting dispensers, automated SMT lines, and dedicated high-temperature aging chambers. Every single 400W semi-potted unit undergoes 100% full-load burn-in testing prior to shipment to ensure zero-defect delivery for your global engineering projects.
Q1: Why is a semi-potted rainproof power supply better for outdoor LED screens than an unpotted supply?
A: Daytime solar heat causes air inside outdoor cabinets to expand, while nighttime cooling draws humid air in (the “breathing effect”). Unpotted supplies suffer short circuits when this moisture condenses into water droplets on cold PCB traces. Hwele’s semi-potted design hermetically seals sensitive ICs and logic circuitry in silicone, preventing condensation failures while preserving open airflow pathways for heat dissipation.
Q2: Can this 400W rainproof power supply be mounted horizontally in an outdoor cabinet?
A: No. Rainproof power supplies rely on gravity to slide falling rainwater off their downward-slanted louvered vents. They must always be mounted vertically to ensure rain protection and maintain optimal upward air convection across the cooling chassis.
Q3: What output voltage options are available for the 400W semi-potted series?
A: We offer standard factory configurations in 5V DC (for LED module power), 12V DC, 24V DC, 36V DC, and 48V DC. All models feature a fine-tune voltage potentiometer (±10% adjustment range) on the terminal block.
Q4: Does Hwele provide OEM/ODM custom voltage adjustments or branding for bulk orders?
A: Yes. As a direct factory manufacturer operating an automated 6,000m² facility, we offer custom output voltages, private label branding, customized cable lengths, and tailored terminal block configurations for engineering contract orders.
Specifications
| Model | ERP-400F-12 | ERP-400F-24 | ERP-400F-48 | |
| Output | DC output voltage | 12V | 24V | 48V |
| Rated output voltage | 33A | 16.5A | 8.3A | |
| Output current range | 0~33A | 0~16.5A | 0~8.3A | |
| Output power | 396W | 400.8W | 398.4W | |
| Ripple noise | 150mVp-p | 300mVp-p | 500mVp-p | |
| Voltage regulation range | 10.8~13.2V | 21.6~26.4V | 43.2~52.8V | |
| Voltage accuracy | ±1% | ±1% | ±1% | |
| Linear adjustment rate | ±0.5% | ±0.5% | ±0.5% | |
| Load adjustment rate | ±0.5% | ±0.5% | ±0.5% | |
| Start, rise, hold time | 2000ms,100ms,10ms/230VAC;3000ms,100ms,10ms/115VAC(full load) | |||
| Input | Input voltage range | 200~240VAC,282~339VDC | ||
| Frequency range | 47~63Hz | |||
| AC input current | 3.5A/230VAC | |||
| Power factor | PF>0.5 | |||
| Efficiency | 0.83 | 0.9 | 0.91 | |
| Impulse current | Cold start current 50A/230VAC | |||
| Leakage current | <3.5mA/240VAC | |||
| Protection | Overload protection | Start overload protection for 105% to 135% of rated output power | ||
| Protection mode: constant current mode. Normal output can be automatically restored after abnormal conditions are removed | ||||
| Short circuit protection | Protection mode: constant current mode. Normal output can be automatically restored after abnormal conditions are removed | |||
| Overvoltage protection | 13.8 ~ 16.2V | 27.6~32.4V | 55.2~64.8V | |
| Protection mode: Turn off the output voltage and restart for recovery | ||||
| Overtemperature protection | Protection mode: Turn off the output voltage and recover automatically after the temperature drops | |||
| Environment | Operating temperature | -30°C~+60°C(please refer to the load reduction curve) | ||
| Working humidity | 20% to 90%RH non-condensing | |||
| Store temperature and humidity | -40°C~+85°C; 10%-95% RH Non-condensing | |||
| Secure | Shock resistance | 10 ~ 500Hz, 3G 10min./1 cycle, X, Y, Z axis, duration of 60 minutes | ||
| Pressure resistance | I/P~O/P :1.5KVAC I/P~FG :1.5KVAC O/P~FG : 0.5KVAC | |||
| Insulation resistance | I/P ~O/P, I/P~FG,O/P~FG : 100M Ohms/500VDC/25°C/70%RH | |||
| Meet the standard | Safety standard | Conforms to UL60950-1,TUV EN60950-1, IP44 | ||
| EMC emission | Conforms to EN55022 Class A, GB9254 Class A | |||
| EMC immunity | Conforms to EN61000-4-2,3,4,5,6,8,11, En55024 | |||
| Others | Dimension | 215*118*50(L*W*H) | ||
| Package | 0.9KG/20PCS/19 KG/1.31CUFT/0.037cubic meters | |||
| Note | 1. All parameters are measured at 230VAC voltage input, rated load and 25℃ when not specified. 2. Ripple and noise voltages are measured on a 20MHz bandwidth oscilloscope with a 12-inch twisted pair end and a capacitor of 0.1 μand 47 μ. 3. Accuracy: voltage setting error, linear adjustment rate and load adjustment rate. 4. Linear adjustment rate measurement method: under rated load, from low voltage to high voltage test. 5. Load adjustment rate measurement method: from 0% to 100% rated load. 6. The power supply should be considered as part of the components in the system, and the electromagnetic compatibility should be confirmed in conjunction with the terminal equipment. | |||
Dimensional Drawing
Block Diagram
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