Why Choose the Finder 7P.42.8.275.1020 Type 2 Surge Protection Device?
The Finder 7P.42.8.275.1020 is a high-performance Type 2 surge protection device (SPD) designed to protect single-phase electrical installations against transient overvoltages caused by lightning-induced surges and electrical switching operations. As part of the Finder 7P Series surge protection range, it provides dependable protection for electrical distribution boards, industrial control panels and sensitive electrical equipment.
This surge arrester combines metal oxide varistor (MOV) and encapsulated gas discharge tube (GDT) technology to deliver effective surge suppression with very low leakage current. Its replaceable protection modules, visual status indicators and integrated remote signalling contact simplify maintenance and allow electrical system operators to monitor the condition of the protective components.
Designed for 230 V AC single-phase TT and TN-S electrical systems, the Finder 7P.42.8.275.1020 provides a 20 kA nominal discharge current and a maximum continuous operating voltage of 275 V AC on the line-to-neutral protection path. Its compact two-module design supports straightforward installation on a standard 35 mm DIN rail inside electrical distribution enclosures.
Key Advantages
- Reliable Type 2 surge protection against transient overvoltages and switching surges.
- 20 kA nominal discharge current for effective protection of electrical installations.
- Suitable for 230 V AC single-phase TT and TN-S systems.
- Combined varistor and gas discharge tube technology provides high insulation resistance and minimal leakage current.
- Replaceable surge protection modules reduce maintenance costs and simplify servicing.
- Integrated visual fault indication and remote changeover contact for protection status monitoring.
- Compact 35 mm DIN rail mounting for convenient distribution board installation.
- Designed in accordance with EN 61643-11 requirements for low-voltage surge protective devices.
Key Features
- Finder 7P Series surge protection device.
- Type 2 SPD for low-voltage AC electrical distribution systems.
- 1+NPE protection configuration for single-phase installations.
- 230 V AC nominal system voltage.
- 275 V AC maximum continuous operating voltage (L–N).
- 20 kA nominal discharge current (8/20 µs).
- 25 kA maximum discharge current (L–N).
- 40 kA maximum discharge current (N–PE).
- 1.2 kV voltage protection level (L–N).
- 1.5 kV voltage protection level (N–PE).
- Combination of MOV and GDT surge protection elements.
- Replaceable protection cartridges with visual condition indication.
- 1 CO (SPDT) remote signalling contact for fault monitoring.
- IP20 protection rating for installation within suitable electrical enclosures.
- 35 mm DIN rail mounting with screw terminal connections.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Model: 7P.42.8.275.1020
- Product type: Surge protection device / surge arrester
- SPD classification: Type 2
- Protection configuration: 1+NPE
- Electrical network compatibility: Single-phase TT and TN-S
- Nominal system voltage (Un): 230 V AC
- Maximum continuous operating voltage (Uc), L–N: 275 V AC
- Maximum continuous operating voltage (Uc), N–PE: 255 V AC
- Nominal discharge current (In), L–N: 20 kA (8/20 µs)
- Nominal discharge current (In), N–PE: 20 kA (8/20 µs)
- Maximum discharge current (Imax), L–N: 25 kA (8/20 µs)
- Maximum discharge current (Imax), N–PE: 40 kA (8/20 µs)
- Voltage protection level (Up), L–N: 1.2 kV
- Voltage protection level (Up), N–PE: 1.5 kV
- Protection technology: Varistor and encapsulated gas discharge tube
- Short-circuit current rating (Isccr): 35 kA
- Maximum backup fuse rating: 125 A gL/gG
- Response time: 100 ns
- Operating temperature: −40 to +80 °C
- Protection rating: IP20
- Mounting type: 35 mm DIN rail, EN 60715
- Terminal type: Screw terminals
- Remote signalling: 1 changeover contact (SPDT)
- Status indication: Visual Healthy / Replace indication
- Replaceable modules: Yes
- L–N replacement module: 7P.40.8.275.0020
- N–PE replacement module: 7P.40.1.000.0020
- Construction width: 2 modular spaces
- Dimensions (H × W × D): approx. 87.6 × 35.8 × 65.9 mm
- Applicable standard: EN 61643-11
- EAN: 8012823423197
Reliable Surge Protection for Electrical Distribution Systems
Surge protection devices such as the Finder 7P.42.8.275.1020 help prevent damage to electrical and electronic equipment by limiting transient overvoltages. When a surge occurs, the protective components provide a controlled path for the surge current, reducing the voltage stress imposed on connected equipment.
The Finder 7P.42 uses a coordinated protection arrangement with a varistor and gas discharge tube between line and neutral and a gas discharge tube between neutral and protective earth. This configuration is particularly suitable for single-phase TT and TN-S electrical networks where effective surge protection and low leakage current are important.
The device is intended for installation at the boundary between lightning protection zones LPZ 1 and LPZ 2, or higher zones, as part of a coordinated surge protection system. Replaceable modules and remote status signalling help maintain protection availability while simplifying inspection and servicing.
Typical Applications
- Single-phase electrical distribution boards and consumer units.
- Industrial control panels and automation cabinets.
- Commercial building electrical installations.
- Single-phase TT and TN-S electrical distribution systems.
- Protection of PLCs, controllers and industrial electronic equipment.
- Building management and electrical monitoring systems.
- Electrical installations supplying sensitive electronic equipment.
- Machinery control circuits and low-voltage power distribution panels.
