AC surge protective device for low-voltage distribution — three-phase + NPE (3P+N), TT network, protection modes L1, L2, L3–N and N–PE. Thermo-dynamic disconnector, mechanical fault window and remote signalling.
OSPD 301 is ORBITAL's catalogue designation for a Type 2 / Class II surge protective device in a 3P+N (three-phase + NPE) topology for TT low-voltage networks. It sits at the LPZ 1–2 boundary concept to limit lightning and switching transients before they reach downstream distribution and sensitive loads.
Protection modes are L1, L2, L3–N and N–PE. High-energy stages use metal oxide varistor (MOV) elements with a thermo-dynamic disconnector. The mechanical inspection window shows green: OK · red: replace, and remote signalling contacts support panel alarms and supervisory systems.
Technical documentation: Electrical architecture follows IEC/EN 61643-11 Type 2 practice for this 3P+N TT topology. Coding, dimension and wiring illustrations are supplied with quotations and submittal packages on request.
Terminal coding is illustrated below. Dimension and circuit drawings can be supplied with quotations or on request. Full published parameters are summarised in the tables below.
| Electrical parameters | |
| Model designation | FV20C/3+NPE-275S (reference base) |
| SPD protection standard | IEC 61643-11 / EN 61643-11 — Type 2 |
| SPD installation type standard | IEC 61643-11 / EN 61643-11 — Class II |
| Protection level (VDE) | DIN VDE 0675-6 — Class C |
| Type of network | TT |
| Protection mode | L1, L2, L3–N · N–PE |
| Nominal voltage Un | 220/380 Vac · 50/60 Hz |
| Maximum continuous operating voltage Uc | 275 Vac · 50/60 Hz |
| Continuous operating current IC | < 20 µA |
| Residual current IPE | ≤ 20 µA dc · ≤ 500 µA ac |
| Standby power consumption PC | ≤ 25 mVA |
| Maximum discharge current Imax (8/20 µs) | 40 kA |
| Nominal discharge current In (8/20 µs) | 20 kA |
| Voltage protection level Up — L–N | ≤ 1.2 kV |
| Voltage protection level Up — N–PE | ≤ 1.5 kV |
| Isolation resistance Risol | > 1000 MΩ |
| Response time tA — L–N | ≤ 25 ns |
| Response time tA — N–PE | ≤ 1000 ns |
| Remote control contact | Yes |
| Disconnection indicator | Mechanical — green OK / red replace |
| Mechanical & environmental | |
| I/O connections | Screw terminal 10–35 mm² · connection bus option |
| Installation location | Inside |
| Mounting type | Symmetrical DIN rail (EN 50022 / DIN 46277-3) |
| Colour | Grey |
| Degree of protection | IP20 |
| Housing material | UL94 V-0 |
| Ambient temperature | −40°C · +80°C |
| Altitude | ≤ 2000 m amsl |
| Permissible humidity | 30%–90% |
Typical panel mounting — retain conductor sizing, torque values and clearances per project drawings.
