Why Choose the Finder 7P.21.8.130.0015 Type 2 Surge Protection Device?
The Finder 7P.21.8.130.0015 is a compact, single-pole Type 2 surge protection device (SPD) designed to protect compatible low-voltage electrical installations against transient overvoltages caused by lightning-induced surges and electrical switching operations. Part of the Finder 7P Series, this DIN rail-mounted surge arrester combines metal oxide varistor technology, replaceable surge protection and visual status indication in a space-saving modular housing.
Designed for appropriately rated AC and DC circuits, the Finder 7P.21.8.130.0015 features a maximum continuous operating voltage (Uc) of 130 V AC or 170 V DC. It is particularly useful for electrical control systems, industrial automation equipment, specialist low-voltage distribution circuits and applications where a lower-voltage surge protection device is required.
With a nominal discharge current (In) of 15 kA and a maximum discharge current (Imax) of 40 kA, measured using the 8/20 µs surge current waveform, this Type 2 SPD provides substantial transient surge-handling capability. Its voltage-limiting varistor technology helps divert surge current through the intended protective path and reduce the risk of damage to connected electrical equipment.
The 7P.21.8.130.0015 is the version without remote signalling contacts, making it a straightforward solution where local visual protection status indication is sufficient. Its 17.5 mm DIN rail width and replaceable protective cartridge help simplify installation and ongoing maintenance in electrical distribution boards and industrial control panels.
Key Advantages
- Type 2 surge protection for compatible low-voltage AC and DC electrical installations.
- Single-pole design for individual circuit protection and coordinated SPD arrangements.
- 130 V AC maximum continuous operating voltage for suitably rated AC systems.
- 170 V DC maximum continuous operating voltage for compatible DC applications.
- 15 kA nominal discharge current using the 8/20 µs waveform.
- 40 kA maximum discharge current for high-energy transient surge events.
- Metal oxide varistor technology provides fast voltage-limiting protection.
- Replaceable varistor cartridge simplifies maintenance of the protective element.
- Visual protection status indication allows straightforward local inspection.
- No remote signalling contact makes this variant suitable where external status monitoring is unnecessary.
- Compact 17.5 mm modular width saves space in distribution boards and control cabinets.
- Standard 35 mm DIN rail mounting supports convenient panel installation.
- IP20 protection rating for installation within suitable electrical enclosures.
- -40 °C to +80 °C operating temperature range supports demanding industrial environments.
- Finder 7P Series construction offers a practical surge protection solution for professional electrical installations.
Key Features
- Finder 7P Series surge protection device.
- Type 2 / Class II surge arrester.
- Single-pole configuration.
- Metal oxide varistor (MOV) protection technology.
- Nominal AC system voltage: 110 V AC.
- Nominal DC system voltage: 125 V DC.
- Maximum continuous operating voltage: 130 V AC / 170 V DC.
- Nominal discharge current: 15 kA.
- Maximum discharge current: 40 kA.
- Discharge current test waveform: 8/20 µs.
- Voltage-limiting protection against transient overvoltages.
- Visual protection status indicator.
- Replaceable varistor protection module.
- Without remote signalling contact.
- 17.5 mm housing width.
- 35 mm DIN rail mounting.
- IP20 ingress protection.
- Operating temperature: -40 °C to +80 °C.
- Suitable for appropriately coordinated electrical surge protection installations.
- EAN / GTIN: 8012823400822.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Manufacturer part number: 7P.21.8.130.0015
- EAN / GTIN: 8012823400822
- Product type: Surge protection device / surge arrester
- SPD classification: Type 2 / Class II
- Number of poles: 1
- Protection technology: Metal oxide varistor
- Nominal AC voltage (Un): 110 V AC
- Nominal DC voltage: 125 V DC
- Maximum continuous operating voltage (Uc), AC: 130 V AC
- Maximum continuous operating voltage (Uc), DC: 170 V DC
- Nominal discharge current (In): 15 kA
- Maximum discharge current (Imax): 40 kA
- Discharge current waveform: 8/20 µs
- Voltage protection level (Up): Approximately 0.6–0.7 kV; confirm the applicable value against the current manufacturer datasheet
- Short-circuit current rating (Isccr): 50 kA, subject to specified installation conditions
- Visual status indication: Yes
- Remote signalling contact: No
- Replaceable protective element: Varistor cartridge
- Mounting: 35 mm DIN rail
- Housing width: 17.5 mm
- Modular size: 1 module
- Ingress protection: IP20
- Operating temperature range: -40 °C to +80 °C
- Application: Compatible low-voltage AC and DC electrical systems
- Installation environment: Inside a suitable electrical distribution or control enclosure
Electrical installations can experience transient overvoltages caused by switching operations, lightning activity and disturbances travelling through connected power cables. Even short-duration voltage spikes can damage electronic equipment, industrial controllers, power supplies and other sensitive components. The Finder 7P.21.8.130.0015 is designed to help protect appropriately rated circuits against these electrical disturbances.
The device incorporates a metal oxide varistor, which provides voltage-dependent resistance. During normal operation, 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. This helps limit the voltage applied to downstream equipment.
The 130 V AC maximum continuous operating voltage makes this model suitable for specific lower-voltage AC systems, while its 170 V DC rating provides compatibility with certain DC applications. These values are important when selecting an SPD because the device must withstand the normal operating voltage of the protected circuit without unwanted operation.
Its 15 kA nominal discharge current and 40 kA maximum discharge current demonstrate the surge current capability of the protective element under the standard 8/20 µs test waveform. These ratings are useful when designing a coordinated surge protection system and assessing the expected transient exposure of the installation.
As a Type 2 surge protection device, the Finder 7P.21.8.130.0015 is intended primarily for protection against induced lightning surges and switching transients. It should not be treated as a direct substitute for a Type 1 lightning current arrester where the installation requires protection against partial direct lightning currents.
The replaceable varistor cartridge helps simplify maintenance, while the visual status indicator provides a convenient way to identify when the protective element requires attention. This version does not include remote signalling contacts, making it particularly appropriate for installations where periodic local inspection is sufficient.
Compact DIN Rail Installation and Straightforward Maintenance
The Finder 7P.21.8.130.0015 mounts onto a standard 35 mm DIN rail and occupies just 17.5 mm of rail width. This compact construction makes it suitable for electrical distribution boards, industrial control panels and other enclosures where space is limited.
As a single-pole SPD, the device must be connected according to the intended protective path and the electrical system's earthing arrangement. Correct installation is essential to ensure that surge current can be diverted effectively without compromising the safety or operation of the protected circuit.
The SPD should be installed with appropriate upstream protection and suitably sized conductors. Connection lengths should be kept as short and direct as practicable, in accordance with the manufacturer's instructions and applicable installation standards, to help minimise additional voltage drop during surge events.
The visual protection status indicator should be checked during routine electrical maintenance. If the protective element is no longer serviceable, the correct manufacturer-specified replacement cartridge should be fitted by a competent electrical professional after the installation has been safely isolated.
Because the 7P.21.8.130.0015 does not include remote signalling contacts, it cannot directly provide a remote healthy/fault contact signal. Where remote monitoring is required, the Finder 7P.21.8.130.1015 is the corresponding variant designed with remote signalling functionality.
The device has an IP20 protection rating and must be installed within a suitable electrical enclosure. Selection and installation should comply with applicable electrical regulations and relevant surge protection standards, including the appropriate requirements of BS 7671 and EN 61643-11.
Typical Applications
- Low-voltage AC electrical distribution circuits.
- Compatible DC electrical distribution systems.
- 110 V AC industrial control installations.
- Industrial automation and control panels.
- PLC and industrial electronic equipment protection.
- Industrial instrumentation and monitoring equipment.
- Electrical control circuits exposed to switching transients.
- Specialist low-voltage electrical installations.
- Building automation and control systems.
- Utility and infrastructure control cabinets.
- Electrical equipment requiring compact single-pole surge protection.
- Control panel refurbishment and maintenance.
- Electrical distribution boards requiring Type 2 surge protection.
- Installations where local visual SPD status indication is sufficient.
