MD400PC4.2+3.2H LED screen power supply
The Rong-Electric MD400PC4.2+3.2H converts AC mains power into two DC rails for common-cathode LED displays: 4.2 V and 3.2 V. Its slim 208 × 58 × 26 mm housing is suited to cabinet designs that require separate output rails. Match the module voltage, load on each rail and terminal layout before choosing a replacement.
Technical specifications
| Parameter | Specification |
|---|---|
| Rated AC input | 200–240 Vac |
| Operating AC input range | 180–264 Vac |
| Input frequency | 47–63 Hz |
| DC output voltage | V1: 4.2 V; V2: 3.2 V |
| Output current range | V1: 0–55 A; V2: 0–35 A |
| Output current without auxiliary heat dissipation | V1: 44 A; V2: 28 A |
| Output voltage range | V1: 4.12–4.28 Vdc; V2: 3.13–3.26 Vdc |
| Efficiency | ≥87% at 220 Vac, full load and room temperature |
| Power factor | ≥0.95 at full load |
| Leakage current | ≤1.0 mA at 242 Vac, as listed in the feature summary |
| Operating temperature | −30 to +70°C; linear derating from +50 to +70°C |
| Cooling | Ventilation cooling; additional aluminum heat-spreading substrate required as specified |
| Protection | Output overvoltage, overcurrent and short-circuit protection |
| Dimensions | 208 × 58 × 26 mm |
| Weight | ≤556 g, as listed in the feature summary |
Power and cooling checks
This model uses 180–264 Vac input; its specified range does not cover 110 V mains. The manufacturer separates normal output current from operation without auxiliary cooling: without auxiliary heat dissipation, the listed currents are 44 A on V1 and 28 A on V2. Follow the PDF’s mounting, heat-spreading and temperature-derating instructions before applying full load.
The PDF identifies the AC connector as earth, neutral and line, and the DC terminals as +V1, GND, GND and +V2. Verify the actual markings and drawing before connection. Protection recovery differs by rail: the 4.2 V rail supports automatic recovery from a short circuit, while the 3.2 V rail latches off and requires a power cycle.
Storage
The packaging instructions specify boxed storage at −20 to +80°C and 10–90% relative humidity. Keep cartons at least 20 cm above the floor and 40 cm from walls, heat sources, windows or air inlets, away from harmful gases, corrosive chemicals, vibration and strong magnetic fields. Units stored for more than one year should be retested.
Product images
Download specification
MD400PC4.2+3.2H Rong-Electric led Power Supply Specification
Frequently asked questions
What are the outputs of the MD400PC4.2+3.2H?
V1 is rated at 4.2 V with a 0–55 A current range; V2 is rated at 3.2 V with a 0–35 A range. Observe the cooling and temperature limits for these ratings.
Can this Rong power supply run from 110 V AC?
No. Its specified operating input range is 180–264 Vac, with a rated input of 200–240 Vac.
Does the power supply need an additional heatsink?
The specification requires an aluminum heat-spreading substrate for the stated operating conditions. Without auxiliary heat dissipation, it lists reduced output currents of 44 A and 28 A. Follow the mounting instructions and derating curves in the PDF.
Is it interchangeable with MDA400PC4.2+3.2?
Do not assume interchangeability from the similar names. Check the complete model suffix, input range, dimensions, terminal layout and required output current against your existing unit.
Where can I find the MD400PC4.2+3.2H wiring diagram?
The original specification PDF linked above includes the AC connector definition, DC terminal assignments, mechanical drawing and thermal requirements.
