6.8.4Classification#
Manufacturers of power systems SPDs generally classify their SPDs according to the following:
Table 6.8.4 – Manufacturer's classification of surge protection devices (IEC 61643 12)
| Number of ports | One, two |
| Design topology | Voltage switching, voltage limiting, combination |
| Location installed | Indoor enclosure, outdoor enclosure |
| Accessibility | Accessible, inaccessible without tools |
| Mounting method | Fixed, portable |
| Disconnector | Location: Internal, external, both internal and external Protection: Thermal, leakage current, overcurrent |
| Degree of protection | IP rating |
| Temperature range | Normal, extended |
| Power system | AC between 47–63 Hz, other |
| Multipole SPD | Yes, no |
| SPD failure mode | Open circuit, short circuit |
