MD7DP is a thin DC power supply surge protector with a discharge current of 20kA (8/20μs) and 1kA (10/350μs). It is only 7 mm thick and saves space, making it suitable for multi-point protection. The multi-pole protection circuit design provides excellent protection performance. It uses a metal DIN rail buckle and is grounded via the DIN rail. It has a display light and meets CE standards.
The MD7DP is a thin‑profile (7 mm) lightning arrester designed for low‑capacity DC power supplies. It provides high surge protection (20 kA for 8/20 µs) and features a metal DIN‑rail clip that also serves as a grounding point. The device includes a green LED indicator that lights when power is applied and extinguishes when the safety fuse opens.
Installation is performed on a DIN rail (35 mm width, 1 mm thickness) with recommended iron or copper rails to ensure good conductivity. The arrester complies with IEC 61643‑21 (C1, C2, D1) and EMC directives EN 61000‑6‑4 and EN 61000‑6‑2, and operates within –25 °C to +85 °C and 30 %–90 % RH. This manual is written in Chinese.
| Surge current rating | 20 kA (8/20 µs), 1 kA (10/350 µs) |
|---|---|
| Maximum load current | 1.2 A |
| Internal series resistance | ≤ 0.80 Ω (round‑trip two‑wire) |
| Maximum working voltage (line‑to‑line) | 14 V (12 V version) / 27 V (24 V version) |
| Line‑to‑ground voltage | 160 V |
| Voltage protection level (UP) | +150 V (12 V version) / +170 V (24 V version) line‑to‑line, +1200 V line‑to‑ground |
| Response time (line‑to‑line) | ≤ 4 ns |
| Response time (line‑to‑ground) | ≤ 20 ns |
| Leakage current (line‑to‑line) | ≤ 6 mA |
| Leakage current (line‑to‑ground) | ≤ 5 mA |
| Protection class | IP20 |
| Enclosure material | Flame‑retardant black resin |
| Indicator light | Green LED (on with power, off when fuse blows) |
| Weight | ≈ 70 g |
| Operating temperature range | –25 °C to +85 °C |
| Operating humidity range | 30 %–90 % RH (non‑condensing) |
| Mounting method | DIN‑rail (35 mm width, 1 mm thickness) |
| Connection type | Euro‑type terminal, torque ≤ 0.3 Nm |
| Applicable wire size | 0.2 mm² – 2.5 mm² |
| Grounding method | DIN‑rail grounding |
It can withstand a surge current of 20 kA for an 8/20 µs waveform and 1 kA for a 10/350 µs waveform.
The maximum continuous load current is 1.2 A.