Finder 7P.10.8.275.0012 – 7P Series Surge Protection Devices

Why Choose the Finder 7P.10.8.275.0012 Replacement Varistor Surge Protection Module?

The Finder 7P.10.8.275.0012 is a high-performance replacement varistor module designed for compatible Finder 7P Series Type 1+2 surge protection devices (SPDs). Engineered to help maintain protection against transient overvoltages caused by lightning activity and electrical switching events, this plug-in cartridge provides a practical solution for servicing surge protection equipment in commercial, industrial and electrical distribution installations.

Featuring a maximum continuous operating voltage of 275 V AC, a 12.5 kA lightning impulse current rating and a 30 kA nominal discharge current, the Finder 7P.10.8.275.0012 is designed for demanding surge protection applications. Its metal oxide varistor technology helps limit transient overvoltages by providing a controlled path for surge current when incorporated into a correctly designed SPD assembly.

The cartridge offers a maximum discharge current of 60 kA (8/20 µs) and a voltage protection level of 1.2 kV, supporting the low-voltage protection characteristics of compatible Finder Type 1+2 SPDs. Its 25 ns specified response time enables rapid reaction to transient overvoltage events.

Designed as a replaceable plug-in module, the Finder 7P.10.8.275.0012 allows maintenance engineers to replace the protective varistor element in compatible Finder 7P.12, 7P.13, 7P.14 and 7P.15 assemblies without automatically replacing the entire surge protection device. This helps simplify servicing, minimise unnecessary component replacement and maintain the intended protection of connected electrical equipment.

Key Advantages

• Replacement varistor cartridge for compatible Finder 7P Series surge protection devices.
• Type 1+2 SPD compatibility for high-performance electrical surge protection assemblies.
• 275 V AC maximum continuous operating voltage for compatible 230/400 V electrical systems.
• 12.5 kA lightning impulse current rating using the 10/350 µs waveform.
• 30 kA nominal discharge current for 8/20 µs surge events.
• 60 kA maximum discharge current provides substantial surge handling capability.
• Low 1.2 kV voltage protection level helps limit transient overvoltages reaching downstream equipment.
• 25 ns response time supports rapid protective operation.
• Metal oxide varistor technology provides effective voltage-limiting surge protection.
• Plug-in replacement construction simplifies maintenance of compatible SPD assemblies.
• No rewiring of the SPD base normally required when replacing the correct cartridge.
• IP20 protection rating for installation within suitable electrical enclosures.
• -40 °C to +80 °C operating temperature range supports demanding installation environments.
• Compact replacement module helps maintain existing electrical panel layouts.

Key Features

• Finder 7P Series surge protection replacement component.
• Manufacturer part number: 7P.10.8.275.0012.
• Product type: Replacement varistor module.
• Protection technology: Metal oxide varistor (MOV).
• Maximum continuous operating voltage (Uc): 275 V AC / 350 V DC.
• Lightning impulse current (Iimp): 12.5 kA.
• Lightning impulse test waveform: 10/350 µs.
• Nominal discharge current (In): 30 kA.
• Maximum discharge current (Imax): 60 kA.
• Discharge current test waveform: 8/20 µs.
• Voltage protection level (Up): 1.2 kV.
• Specified response time: 25 ns.
• IP20 ingress protection.
• Operating temperature: -40 °C to +80 °C.
• Plug-in cartridge construction for compatible SPD bases.
• Compatible with selected Finder 7P.12, 7P.13, 7P.14 and 7P.15 assemblies.
• Suitable for maintaining Type 1+2 surge protection systems.
• EAN: 8012823361918.

High-Performance Varistor Protection Against Transient Overvoltages

Electrical distribution systems are vulnerable to transient overvoltages caused by lightning activity, electrical switching operations and disturbances on the supply network. These events can introduce high-voltage impulses into an installation, potentially damaging electronic equipment, automation controllers, power supplies and other sensitive electrical components. The Finder 7P.10.8.275.0012 is designed to maintain the voltage-limiting protection provided by compatible Finder 7P Series surge protection assemblies.

The module uses metal oxide varistor technology, which changes its electrical resistance in response to voltage. Under normal operating conditions, the varistor presents high resistance. When a transient overvoltage occurs, its resistance decreases rapidly, allowing surge current to be diverted through the intended protective path and helping limit the voltage experienced by connected equipment.

With a 12.5 kA lightning impulse current rating using the 10/350 µs waveform, the cartridge is designed for high-energy surge conditions associated with Type 1 lightning impulse testing. Its 30 kA nominal discharge current and 60 kA maximum discharge current, both measured using the 8/20 µs waveform, provide additional surge performance characteristics for selecting and maintaining compatible protection systems.

The 1.2 kV voltage protection level is particularly valuable where low residual voltage is desirable to help protect downstream electrical and electronic equipment. This characteristic supports the low-Up design of compatible Finder 7P Type 1+2 surge protection devices. Actual protection performance depends on the complete SPD assembly, installation wiring, earthing arrangement and coordination with other protective devices.

The cartridge is intended to be installed in a compatible Finder SPD base, where it forms part of a complete surge protection system. The modular construction makes it possible to replace the protective element when required, helping extend the useful service life of the remaining assembly and reduce maintenance costs.

Correct product selection is essential. The Finder 7P.10.8.275.0012 is a varistor replacement module and must not be confused with the Finder 7P.10.1.000.0025 spark gap module. These products perform different protective functions and are not interchangeable simply because they belong to the same Finder 7P Series.

Installation, Replacement and Maintenance

The Finder 7P.10.8.275.0012 is intended for installation into a compatible Finder 7P Series surge protection assembly. It is not a complete standalone DIN rail-mounted SPD and must not be connected directly to an electrical distribution system without the appropriate mounting base.

Before replacing a surge protection cartridge, the electrical installation must be made safe by a competent electrical professional. The relevant circuits should be isolated using an approved procedure, and the absence of dangerous voltage must be verified before work begins.

Once the correct replacement module has been identified, the cartridge can be fitted into the compatible SPD base according to Finder's installation instructions. The plug-in design allows replacement without normally requiring the existing base wiring to be disconnected, helping reduce maintenance time.

The protective status of the complete SPD assembly should be inspected as part of a planned maintenance programme. Where the manufacturer's status indication identifies that the protective element has reached the end of its service life, the affected cartridge should be replaced with the specified component.

The IP20 protection rating means the module must be installed within an appropriately rated electrical distribution enclosure. The complete surge protection installation should comply with applicable electrical regulations and relevant IEC/EN 61643 requirements.

Typical Applications

• Replacement cartridges for compatible Finder 7P surge protection devices.
• Maintenance of Type 1+2 surge protection assemblies.
• Commercial electrical distribution boards.
• Industrial electrical switchboards.
• Main and sub-distribution electrical panels.
• Building services and infrastructure electrical installations.
• Industrial automation and machinery control cabinets.
• Electrical systems exposed to lightning-related surge risks.
• Renewable energy electrical distribution installations.
• Electrical protection for building management systems.
• Road and tunnel lighting electrical distribution equipment.
• Lift and escalator electrical supply systems.
• EV charging infrastructure distribution boards.
• Planned replacement of worn or failed SPD varistor cartridges.