Why Choose the Finder 7P.20.8.440.0020 Replacement Surge Protection Module?
The Finder 7P.20.8.440.0020 is a genuine replacement varistor cartridge for Finder 7P Series Type 2 surge protection devices (SPDs). Designed for use with compatible Finder 7P.21.8.440.x020 surge arresters, this plug-in module enables electrical maintenance professionals to restore surge protection without replacing the complete SPD assembly.
Featuring a 440 V AC / 585 V DC maximum continuous operating voltage, the Finder 7P.20.8.440.0020 provides a 20 kA nominal discharge current and 40 kA maximum discharge current, both measured using the 8/20 µs surge waveform. Its metal oxide varistor technology provides rapid protection against transient overvoltages associated with electrical switching operations and induced lightning surges.
With a 1.9 kV voltage protection level, 25 ns response time and compact single-module construction, this replacement cartridge provides a practical maintenance solution for compatible surge protection installations. Its plug-in design supports efficient replacement of an end-of-life varistor module while retaining the existing SPD base and wiring.
Key Advantages
- Genuine Finder replacement module: Designed for compatible Finder 7P Series surge protection assemblies.
- Type 2 surge protection: Supports protection against induced lightning surges and electrical switching transients.
- 440 V AC maximum continuous operating voltage: Suitable for compatible higher-voltage AC surge protection applications.
- 585 V DC maximum continuous operating voltage: Provides compatibility with specified DC surge protection configurations.
- 20 kA nominal discharge current: Supports reliable handling of transient surge currents.
- 40 kA maximum discharge current: Provides additional surge current handling capability.
- 1.9 kV voltage protection level: Helps limit transient overvoltages in compatible electrical installations.
- Fast varistor response: Provides a specified response time of 25 ns.
- Plug-in replacement construction: Allows the protective cartridge to be exchanged without replacing the complete compatible SPD base.
- Compact dimensions: Designed to fit within the corresponding Finder surge protection assembly.
- Wide operating temperature range: Suitable for operation from −40 to +80 °C.
- Reduced maintenance downtime: Supports straightforward replacement when the existing cartridge reaches the end of its service life.
- Original equipment compatibility: Maintains the intended protection characteristics when installed in the specified Finder SPD assembly.
Key Features
- Finder 7P Series replacement surge protection cartridge.
- Metal oxide varistor protection technology.
- Replacement module for compatible Type 2 SPDs.
- 440 V AC maximum continuous operating voltage (Uc).
- 585 V DC maximum continuous operating voltage (Uc).
- 20 kA nominal discharge current (In), 8/20 µs.
- 40 kA maximum discharge current (Imax), 8/20 µs.
- 1.9 kV voltage protection level (Up).
- 1.5 kV voltage protection level at 5 kA (Up5).
- 25 ns response time.
- Plug-in cartridge mounting.
- Compatible with Finder 7P.21.8.440.x020 assemblies.
- Single-module replacement construction.
- Visual condition indication within the compatible SPD assembly.
- IP20 ingress protection.
- −40 to +80 °C operating temperature range.
- Compact 17.4 mm cartridge width.
- Suitable for maintenance of compatible 400 V AC three-phase surge protection installations.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Model: 7P.20.8.440.0020
- Manufacturer part number: 7P.20.8.440.0020
- Alternative product code: 7P2084400020
- Product type: Replacement surge protection cartridge
- Accessory category: Replacement varistor module for surge arrester
- Protection technology: Metal oxide varistor
- SPD application: Type 2 surge protection
- Compatible SPD family: Finder 7P.21.8.440.x020
- Nominal AC system voltage of compatible SPD: 400 V AC
- Maximum continuous operating voltage (Uc), AC: 440 V AC
- Maximum continuous operating voltage (Uc), DC: 585 V DC
- Nominal discharge current (In), 8/20 µs: 20 kA
- Maximum discharge current (Imax), 8/20 µs: 40 kA
- Voltage protection level (Up): 1.9 kV
- Voltage protection level at 5 kA (Up5): 1.5 kV
- Response time: 25 ns
- Mounting method: Plug-in cartridge for compatible SPD base
- Modular construction: Single replacement module
- Module height: 48.3 mm
- Module width: 17.4 mm
- Module depth: 45 mm
- Net weight: 54.5 g
- Operating ambient temperature: −40 to +80 °C
- Ingress protection: IP20
- Applicable SPD standard: EN 61643-11
- Country of origin: Czech Republic
- EAN: 8012823422282
Reliable Replacement Protection for Finder 7P Type 2 Surge Arresters
Electrical distribution systems are exposed to transient overvoltages caused by lightning activity, switching operations and disturbances within the supply network. Surge protection devices use protective components such as metal oxide varistors to divert surge currents and limit the voltage reaching connected equipment. Repeated surge exposure can eventually cause these components to deteriorate, making replacement necessary to maintain the intended level of protection.
The Finder 7P.20.8.440.0020 replacement varistor cartridge is designed to restore the protective function of compatible Finder 7P.21.8.440.x020 Type 2 surge arresters. Its 20 kA nominal discharge current, 40 kA maximum discharge current and 1.9 kV voltage protection level support protection against induced lightning surges and electrical switching transients.
The cartridge's 440 V AC maximum continuous operating voltage makes it suitable for the specified Finder Type 2 SPD range used in compatible three-phase 400 V AC installations. The corresponding 585 V DC rating may also support suitable DC applications where the complete protective assembly is approved for the intended system.
Its plug-in construction allows the protective cartridge to be replaced while retaining the compatible SPD base. The complete assembly provides visual indication of the varistor's condition, helping maintenance personnel identify when replacement is required.
Important installation consideration: The Finder 7P.20.8.440.0020 is a replacement cartridge rather than a complete standalone surge protection device. It must only be installed in a compatible Finder SPD base. The electrical installation must be safely isolated before replacement, and the manufacturer's instructions and applicable electrical regulations must be followed.
Typical Applications
- Replacement of varistor cartridges in Finder 7P.21.8.440.x020 surge arresters.
- Maintenance of compatible Type 2 surge protection devices.
- Three-phase 400 V AC electrical distribution systems.
- Industrial electrical distribution boards.
- Commercial building electrical infrastructure.
- Industrial automation and control panels.
- Machinery and equipment supply protection.
- Building management and electrical monitoring systems.
- Electric vehicle charging infrastructure with compatible surge protection assemblies.
- Road and tunnel lighting electrical distribution systems.
- Lift and building services electrical installations.
- Preventive maintenance of surge protection equipment.
- Replacement of end-of-life SPD varistor cartridges.
- Electrical panel-building and maintenance operations.
