MDHA is a DC power supply lightning arrester in the M-RESTER series. Its main function is to protect electronic equipment power circuits from lightning surge shocks. It is suitable for power circuits below 5A. The product has a life display function that can display the damage and life status of internal components, and output alarm contacts. When the surge absorption element's function is weakened or its life is up, the power can still continue to be supplied.
This manual describes the MDHA lightning arrester, its main functions and safety features. It explains how the device protects low‑current (≤5 A) circuits from surge currents and indicates status through LED indicators.
The document includes rated parameters, mechanical dimensions, installation methods (wall‑mount or DIN‑rail), and detailed electrical specifications such as surge capacity, voltage ratings, and internal resistance. It also provides a circuit diagram and wiring notes for proper grounding. This manual is written in Chinese.
| Rated Voltage (AC) | 125 VAC 0.5 A |
|---|---|
| Rated Voltage (DC) | 30 VDC 41 A |
| Maximum Voltage | 125 VAC / 110 VDC |
| Maximum Power | 62.5 VA (AC), 30 W (DC) |
| Minimum Load | 5 VDC, 1 mA |
| Operating Temperature Range | -5 °C to 155 °C |
| Operating Humidity Range | 30 %–90 % RH |
| Weight | 500 g |
| Rated Surge Capacity | 10 000 A (8/20 µs) |
| Maximum Load Current | 5 A |
| Contact Resistance | ≥100 MΩ at 500 VDC |
| Insulation Strength | 1500 VAC for 1 min |
| Internal Resistance | ≤0.2 Ω (round‑trip) |
| Terminal Type | M3.5 screw terminals |
The MDHA is rated for a surge capacity of 10 000 A with an 8/20 µs waveform.