Why Choose the Finder 7P.27.8.275.1020 Type 2 Surge Protection Device?
The Finder 7P.27.8.275.1020 is a Type 2 surge protection device (SPD) designed for single-phase TN-S electrical installations. Part of the Finder 7P Series, this surge arrester protects electrical equipment against transient overvoltages caused by induced lightning surges and electrical switching operations.
Designed for 230 V AC single-phase systems, the Finder 7P.27.8.275.1020 features a 275 V AC maximum continuous operating voltage (Uc), a 20 kA nominal discharge current (In) and a 40 kA maximum discharge current (Imax), measured using the 8/20 µs surge waveform. Its two metal oxide varistor protection paths provide surge protection between the line and protective earth and between the neutral and protective earth conductors.
Unlike the corresponding version without remote monitoring, the 7P.27.8.275.1020 includes an integrated remote status signalling contact. Combined with replaceable varistor cartridges and optical condition indicators, this feature allows maintenance personnel to monitor the device's protective status locally or through compatible external alarm and monitoring equipment.
Key Advantages
- Type 2 surge protection: Helps protect electrical equipment against induced lightning surges and switching transients.
- Single-phase TN-S compatibility: Designed for electrical systems with separate line, neutral and protective earth conductors.
- Two-varistor protection: Provides protection between L-PE and N-PE.
- 20 kA nominal discharge current: Provides substantial surge current handling capability.
- 40 kA maximum discharge current: Supports protection against higher-energy transient overvoltage events.
- 275 V AC maximum continuous operating voltage: Suitable for compatible 230 V AC electrical installations.
- 1.35 kV voltage protection level: Helps limit transient overvoltages reaching connected equipment.
- Integrated remote signalling: Allows external monitoring of the SPD's operational condition.
- Visual condition indication: Enables quick local inspection of the protective modules.
- Replaceable varistor cartridges: Simplifies maintenance without requiring replacement of the complete assembly.
- Compact DIN rail construction: Occupies two modular spaces in compatible electrical distribution enclosures.
- 50 kA short-circuit current rating: Supports use in appropriately designed electrical installations.
- Wide operating temperature range: Suitable for operation between −40 and +80 °C.
Key Features
- Finder 7P Series surge protection device.
- Type 2 SPD classification.
- Single-phase TN-S electrical system application.
- Two metal oxide varistor protection paths.
- Protection between L-PE and N-PE.
- 230 V AC nominal system voltage.
- 275 V AC maximum continuous operating voltage (Uc).
- 20 kA nominal discharge current (In), 8/20 µs.
- 40 kA maximum discharge current (Imax), 8/20 µs.
- 1.35 kV voltage protection level (Up).
- 0.9 kV voltage protection level at 5 kA.
- Replaceable varistor modules.
- Optical protection status indication.
- Integrated remote status signalling contact.
- 1 changeover (SPDT) signalling contact.
- 35 mm DIN rail mounting.
- Two DIN-module housing format.
- IP20 ingress protection.
- −40 to +80 °C operating temperature range.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Model: 7P.27.8.275.1020
- Manufacturer part number: 7P.27.8.275.1020
- Product type: Surge protection device
- SPD classification: Type 2
- Electrical system: Single-phase AC
- Compatible earthing system: TN-S
- Protection arrangement: L-PE and N-PE
- Number of protected conductors: 2
- Protection technology: Metal oxide varistor
- Number of varistor protection elements: 2
- Nominal system voltage: 230 V AC
- Maximum continuous operating voltage (Uc): 275 V AC
- Nominal discharge current (In), 8/20 µs: 20 kA
- Maximum discharge current (Imax), 8/20 µs: 40 kA
- Voltage protection level (Up): 1.35 kV
- Voltage protection level at 5 kA: 0.9 kV
- Short-circuit current rating (ISCCR): 50 kA
- Maximum upstream fuse rating: 160 A gG
- Protection modules: Replaceable varistor cartridges
- Replacement varistor module: 7P.20.8.275.0020
- Local status indication: Optical condition indicator
- Remote signalling: Yes
- Remote contact configuration: 1 changeover (SPDT)
- Remote contact rated current: 0.5 A AC / 0.1 A DC
- Remote contact rated voltage: 250 V AC / 30 V DC
- Mounting method: 35 mm DIN rail
- Modular width: 2 DIN modules
- Overall width: 35.8 mm
- Overall depth: 65.9 mm
- Ingress protection: IP20
- Operating ambient temperature: −40 to +80 °C
- Typical installation location: LPZ 1 to LPZ 2 boundary
- Country of origin: Czech Republic
- EAN: 8012823394015
Reliable Single-Phase Surge Protection with Remote Status Monitoring
Electrical installations can experience short-duration transient overvoltages resulting from lightning activity, electrical switching operations and disturbances within the power distribution network. These events can damage electronic equipment, interrupt industrial processes and reduce the operational reliability of connected systems.
The Finder 7P.27.8.275.1020 uses two metal oxide varistor protection elements to limit transient overvoltages in compatible single-phase TN-S systems. The device provides protection between the line and protective earth and between the neutral and protective earth conductors. Its 20 kA nominal discharge current and 40 kA maximum discharge current make it suitable for appropriately selected Type 2 surge protection applications.
A key feature of the 7P.27.8.275.1020 is its integrated remote signalling contact. The changeover contact can be connected to a compatible alarm circuit, building management system or industrial monitoring input, allowing the condition of the SPD to be monitored without relying solely on manual inspection.
The device also includes replaceable varistor cartridges and local optical condition indicators. When a protective module reaches the end of its service life, maintenance personnel can identify the affected cartridge and replace it with the corresponding Finder replacement module, subject to the manufacturer's safe isolation and servicing instructions.
Its compact 35 mm DIN rail-mounted housing occupies two modular spaces and is designed for installation within suitable electrical distribution enclosures. The SPD is particularly useful in applications where both surge protection and remote condition monitoring are required.
Important installation consideration: This device is designed for compatible single-phase TN-S electrical systems. It must be selected according to the system voltage, earthing arrangement, prospective short-circuit current and required surge protection coordination. The remote signalling contact is intended for status monitoring and must not be used as a power switching contact beyond its specified ratings. Installation and servicing should be performed by a suitably qualified electrician.
Typical Applications
- Single-phase TN-S electrical distribution networks.
- 230 V AC electrical distribution boards.
- Commercial building electrical infrastructure.
- Industrial control and automation panels.
- Electrical installations requiring remote SPD condition monitoring.
- Building management and alarm systems.
- Machinery and industrial equipment supply protection.
- Electrical distribution systems with separate neutral and protective earth conductors.
- Critical electrical installations requiring maintenance alerts.
- Type 2 surge protection at LPZ 1 to LPZ 2 boundaries.
- Electrical panel-building and OEM applications.
- Preventive maintenance and electrical infrastructure monitoring.
