Why Choose the Finder 7P.05.8.275.1012 Type 1+2 Surge Protection Device?
The Finder 7P.05.8.275.1012 is a high-performance Type 1+2 three-phase surge protection device (SPD) designed to protect low-voltage electrical installations against lightning-induced surges and switching overvoltages. Part of the Finder 7P Series, this surge arrester features a 3+N configuration with four combined varistor and gas discharge tube (GDT) protection elements, specifically designed for compatible TN-S three-phase electrical systems.
With a 275 V AC maximum continuous operating voltage (Uc), a 30 kA nominal discharge current (In) and a 60 kA maximum discharge current (Imax), the Finder 7P.05.8.275.1012 provides robust protection against transient overvoltages. Its combined Type 1 and Type 2 classification enables protection against high-energy lightning impulse currents as well as switching-related electrical surges.
The device incorporates replaceable surge protection modules, visual status indication and an integrated remote signalling changeover contact for monitoring protection status. Featuring IP20 protection, a compact modular housing and 35 mm DIN rail mounting, it is suitable for industrial distribution boards, commercial switchgear and electrical installations requiring coordinated surge protection.
Key Advantages
- Combined Type 1+2 protection against lightning impulse currents and transient switching overvoltages.
- 3+N configuration designed for compatible three-phase TN-S electrical systems.
- 275 V AC maximum continuous operating voltage for low-voltage electrical distribution applications.
- 30 kA nominal discharge current with an 8/20 µs surge waveform.
- 60 kA maximum discharge current with an 8/20 µs surge waveform.
- 1.5 kV voltage protection level helps limit transient overvoltages reaching connected equipment.
- Four combined varistor and GDT protection elements provide effective surge diversion.
- Leakage-current-free technology helps avoid continuous current flow through the protective elements during normal operation.
- Replaceable protection modules simplify maintenance following surge-related deterioration.
- Visual status indication enables straightforward inspection of protection condition.
- Remote signalling changeover contact supports monitoring from external control equipment.
- 50 kA short-circuit current rating (Isccr) supports suitable industrial distribution applications.
- 35 mm DIN rail mounting provides convenient installation.
- Suitable for coordinated lightning and surge protection in industrial and commercial facilities.
Key Features
- Finder 7P Series surge protection device.
- 7P.05 three-phase TN-S surge arrester configuration.
- Type 1+2 combined lightning current and surge protection.
- Four protection paths: L1–PE, L2–PE, L3–PE and N–PE.
- Combined high-energy varistor and encapsulated spark-gap technology.
- 275 V AC maximum continuous operating voltage (Uc).
- 30 kA nominal discharge current (In).
- 60 kA maximum discharge current (Imax).
- 1.5 kV voltage protection level (Up).
- 50 kA short-circuit current rating.
- IP20 ingress protection.
- −40 to +80 °C operating temperature range.
- Replaceable surge protection modules with retaining system.
- Visual healthy/replacement indication.
- Integrated SPDT remote signalling contact.
- Double screw terminal connection system.
- 35 mm DIN rail mounting according to EN 60715.
- Designed for installation at lightning protection zone boundaries.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Product family: 7P.05
- Model: 7P.05.8.275.1012
- Product type: Combined lightning and surge protection device
- SPD classification: Type 1+2
- Protection configuration: 3+N, four protection paths
- Compatible earthing arrangement: TN-S
- Nominal voltage (Un): 230 V AC phase-to-neutral
- Three-phase system: 230/400 V AC
- Maximum continuous operating voltage (Uc): 275 V AC
- Nominal discharge current (In), 8/20 µs: 30 kA
- Maximum discharge current (Imax), 8/20 µs: 60 kA
- Voltage protection level (Up): 1.5 kV
- Voltage protection level, L–N: 1.5 kV
- Voltage protection level, N–PE: 1.5 kV
- Short-circuit current rating (Isccr): 50 kA
- Protection technology: Combined varistor and gas discharge tube (GDT)
- Number of combined protection elements: 4
- Leakage current: Leakage-current-free design
- Protection module replacement: Replaceable modules
- Local status indication: Visual protection status indicator
- Remote signalling: Integrated SPDT changeover contact
- Operating temperature: −40 to +80 °C
- Ingress protection: IP20
- Mounting: 35 mm DIN rail
- Mounting standard: EN 60715
- Connection type: Screw terminals
- Maximum rigid conductor cross-section: 35 mm²
- Maximum flexible conductor cross-section: 25 mm²
- Housing width: Approximately 72 mm
- Housing height: Approximately 87.6 mm
- Housing depth: Approximately 81.7 mm
- Relevant standard: EN/IEC 61643-11
- EAN: 8012823437927
- Manufacturer part number: 7P.05.8.275.1012
Advanced Type 1+2 Lightning and Surge Protection
The Finder 7P.05.8.275.1012 combines Type 1 lightning current protection with Type 2 transient overvoltage limitation in a single modular device. This enables the SPD to form part of a coordinated protection strategy for electrical installations exposed to lightning-related disturbances and switching surges.
Its four combined varistor and encapsulated spark-gap protection elements provide surge protection between the three phase conductors and protective earth, as well as between neutral and protective earth. The combined technology supports high discharge current capability, low residual voltage and a leakage-current-free design during normal operation.
The device is intended for compatible TN-S earthing arrangements and may be installed at the boundary between lightning protection zones LPZ 0 and LPZ 1, or at other locations determined by the installation's surge protection design. Correct coordination with upstream protection and downstream equipment is essential for effective operation.
Replaceable Modules and Remote Protection Status Monitoring
The Finder 7P.05.8.275.1012 incorporates replaceable surge protection modules, allowing individual protective elements to be serviced when replacement is required. This modular construction helps simplify maintenance compared with arrangements that require complete device replacement.
Each protection module includes visual status indication, enabling maintenance personnel to identify whether the protective element remains operational or requires replacement. The integrated SPDT remote signalling contact allows the SPD status to be incorporated into compatible monitoring systems, providing additional visibility for maintenance and electrical infrastructure management.
For installation, the unit features 35 mm DIN rail mounting and screw terminals. Engineers should verify the required backup fuse arrangement, earthing configuration, conductor routing and protective device coordination using the manufacturer's installation instructions and applicable electrical standards.
Typical Applications
- Three-phase TN-S electrical distribution systems.
- Industrial main distribution boards.
- Commercial building electrical switchboards.
- Industrial automation and PLC control panels.
- Manufacturing machinery power distribution.
- Motor control centres and variable frequency drive installations.
- Building management and HVAC electrical infrastructure.
- Power distribution systems exposed to lightning-related surges.
- Renewable energy installations with compatible AC distribution arrangements.
- Telecommunications and electronic equipment power supplies.
- Electrical infrastructure requiring remote surge protection status monitoring.
- OEM industrial switchgear and electrical distribution assemblies.
