Definition What is SPD (Surge Protective Device)?
SPD is the device protecting various types of equipment from surge.
SPD is the device attenuating the overvoltage and noise and is called SPD or TVSS (Transient Voltage Surge Suppressor).
Specialists in the industry call it SPD. The terms such as SPD and TVSS are used interchangeably.
SPD is the equipment designed to attenuate the dangerous overvoltage at the very short moment appearing in the power line or telephone line, data network,
CCTV circuit, cable TV circuit, and the power line and control line connected to the electronic equipment.
=Ex.) Blocking the general surge of SPD
| || |
| 1, 2, 3, 4 Pole |
Rated system voltage, Un AC [V]
| 220V || 220/380V |
Maximum continuous operating voltage, Uc AC [V]
| 320V || 320V || 320V || 420V || 460V || 320V || 275V |
| Voltage protection level, Up [kV] || ≤ 1.0kV || ≤ 1.2kV || ≤ 1.5kV || ≤ 2.0kV || ≤ 2.3kV || ≤ 1.5kV || ≤ 2.5kV |
Maximum discharge current, Imax(8/20㎲) [kA, per mode]
| 10kA || 20kA || 40kA || 60kA || 70kA || 40kA || 100kA |
| Response time, ns || < 25 ns |
| Usable ambient temperature, ℃ || -40 ~ +80℃ |
| Usable frequency, Hz || 50/60Hz |
| Attachment type || DIN-rail attachment type |
| Operation status indication window || Normal operation : Green LED lighting, Abnormal / After an accident : Red lighting |
| Min. terminal connection || 1 Phase and Neutral 2.5, Earth 4 |
| Protection class || Class III || |
| Alarm Contact || No || No || No || No || No || Yes || Yes |
* The surge protective device starts to operate above the maximum continuous operating voltage Uc (MCOV).
Installation wiring method
* A separate fuse can be installed depending on the side conditions. (The fuse should be purchased separately is not supplied by LS.)