Why Choose the Finder 7P.21.8.075.1015 Type 2 Surge Protection Device?
The Finder 7P.21.8.075.1015 is a compact, single-pole Type 2 surge protection device (SPD) designed to protect low-voltage AC and DC electrical systems against transient overvoltages caused by electrical switching operations and lightning-induced surges. Part of the Finder 7P Series, this DIN rail-mounted surge arrester combines metal oxide varistor technology, replaceable protection and clear visual status indication in a space-saving modular housing.
Specifically developed for low-voltage AC and DC applications, the Finder 7P.21.8.075.1015 features a maximum continuous operating voltage of 75 V AC or 100 V DC. It is suitable for appropriately rated control circuits, industrial automation systems, electrical distribution equipment and other installations where conventional 230 V surge protection devices would not provide the required voltage-limiting characteristics.
With a nominal discharge current of 15 kA and a maximum discharge current of 40 kA, measured using the 8/20 µs waveform, the device provides substantial surge-handling capability for compatible low-voltage circuits. Its 0.4 kV voltage protection level helps reduce the transient voltage reaching downstream equipment when the SPD is correctly selected and installed.
The Finder 7P.21.8.075.1015 also incorporates a replaceable varistor module, visual protection status indication and a remote signalling contact arrangement. Its 17.5 mm DIN rail width makes it a practical solution for industrial panel builders, electrical contractors and maintenance engineers requiring reliable Type 2 surge protection without occupying excessive enclosure space.
Key Advantages
- Type 2 surge protection for transient overvoltages in compatible AC and DC electrical systems.
- Single-pole configuration for flexible protection of individual electrical circuits.
- 75 V AC / 100 V DC maximum continuous operating voltage for low-voltage applications.
- 15 kA nominal discharge current using the 8/20 µs waveform.
- 40 kA maximum discharge current provides high surge-handling capability.
- Low 0.4 kV voltage protection level helps protect sensitive downstream equipment.
- Fast 25 ns response time supports rapid voltage-limiting operation.
- Metal oxide varistor technology provides effective protection against transient overvoltages.
- Replaceable varistor cartridge simplifies maintenance and reduces unnecessary replacement of the complete device.
- Visual status indication makes it easier to identify when the protective module requires replacement.
- Remote signalling capability supports integration with compatible monitoring arrangements.
- Compact 17.5 mm DIN rail design saves valuable control panel space.
- IP20 ingress protection for installation inside suitable electrical enclosures.
- -40 °C to +80 °C operating temperature range supports demanding industrial environments.
Key Features
- Finder 7P Series surge protection device.
- Type 2 SPD classification according to EN 61643-11.
- Single-pole / unipolar protection.
- Suitable for compatible low-voltage AC and DC systems.
- Metal oxide varistor (MOV) protection technology.
- Nominal system voltage: 60 V AC / 60 V DC.
- Maximum continuous operating voltage (Uc): 75 V AC / 100 V DC.
- Nominal discharge current (In): 15 kA.
- Maximum discharge current (Imax): 40 kA.
- Discharge current waveform: 8/20 µs.
- Voltage protection level (Up): 0.4 kV.
- Response time: 25 ns.
- Replaceable varistor module.
- Visual Healthy/Replace status indication.
- Remote status signalling contact.
- 17.5 mm module width.
- 35 mm DIN rail mounting according to EN 60715.
- IP20 protection rating.
- Operating temperature: -40 °C to +80 °C.
- Suitable for installation at appropriate lightning protection zone boundaries.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Manufacturer part number: 7P.21.8.075.1015
- EAN / GTIN: 8012823378510
- Product type: Surge protection device / surge arrester
- SPD classification: Type 2
- Number of poles: 1
- Protection technology: Metal oxide varistor
- Application: Low-voltage AC and DC electrical systems
- Nominal voltage (Un): 60 V AC / 60 V DC
- Maximum continuous operating voltage (Uc): 75 V AC / 100 V DC
- Nominal discharge current (In): 15 kA
- Maximum discharge current (Imax): 40 kA
- Discharge current test waveform: 8/20 µs
- Voltage protection level (Up): 0.4 kV
- Response time (ta): 25 ns
- Protection status indication: Visual Healthy/Replace indicator
- Remote signalling: Changeover contact arrangement
- Replaceable protective element: Yes, varistor module
- Mounting: 35 mm DIN rail, EN 60715
- Module width: 17.5 mm
- Ingress protection: IP20
- Operating temperature range: -40 °C to +80 °C
- Relevant product standard: EN 61643-11
- Installation location: Inside a suitable electrical distribution or control enclosure
Reliable Type 2 Surge Protection for Low-Voltage AC and DC Systems
Low-voltage electrical and electronic equipment can be vulnerable to transient overvoltages even when the normal operating voltage is relatively low. Switching operations, nearby lightning activity and disturbances in connected wiring can generate short-duration voltage spikes capable of damaging sensitive components. The Finder 7P.21.8.075.1015 is designed to help protect appropriately rated AC and DC circuits against these events.
The device uses metal oxide varistor technology to limit transient overvoltages. Under normal conditions, the varistor presents high electrical resistance. When the voltage rises above its protective operating threshold, the varistor rapidly becomes conductive, diverting surge current through the intended protective path and helping reduce the voltage experienced by downstream equipment.
With a maximum continuous operating voltage of 75 V AC or 100 V DC, this model is intended for lower-voltage applications rather than conventional 230 V mains circuits. Correct voltage selection is essential because the SPD must withstand the maximum normal operating voltage of the protected system while providing an appropriate voltage protection level.
The 15 kA nominal discharge current and 40 kA maximum discharge current demonstrate its ability to handle substantial transient surge currents using the standard 8/20 µs test waveform. The 0.4 kV voltage protection level provides a useful characteristic for coordinating the SPD with the impulse withstand capability of connected equipment.
The Finder 7P.21.8.075.1015 is classified as a Type 2 SPD, making it suitable for installation at appropriate points within an electrical surge protection system, commonly around the boundary between lightning protection zones LPZ 1 and LPZ 2 or higher. Where an installation is exposed to direct lightning current, additional appropriately rated Type 1 protection may be necessary.
Its replaceable varistor cartridge helps simplify servicing, while the visual protection status indicator provides a convenient way to check the condition of the protective element. The remote signalling arrangement can also be used with compatible monitoring equipment to provide information about SPD status.
Compact DIN Rail Installation and Simplified Maintenance
The Finder 7P.21.8.075.1015 is designed for installation on a standard 35 mm DIN rail according to EN 60715. With a housing width of just 17.5 mm, it occupies a single modular position and is suitable for compact industrial control panels, electrical distribution boards and equipment cabinets.
As a single-pole SPD, it provides protection across the specified connection path. Depending on the application, the device may be used within appropriately designed low-voltage AC or DC protection arrangements. The correct connection method must be selected according to the electrical system, earthing arrangement and Finder's installation instructions.
The replaceable varistor module allows maintenance engineers to restore the protective element when required without necessarily replacing the complete DIN rail base. The visual Healthy/Replace indicator should be checked during routine electrical inspections and following known significant surge events.
The remote signalling contact arrangement can be incorporated into compatible control and monitoring circuits where remote indication of surge protection status is required. This is particularly useful in unattended electrical installations and industrial automation systems.
The device has an IP20 protection rating and must be installed within an appropriately rated enclosure. Installation and replacement should be performed by a competent electrical professional, with suitable upstream protection, conductor sizing, earthing and compliance with applicable electrical regulations.
Typical Applications
- Low-voltage DC electrical distribution systems.
- Low-voltage AC control circuits.
- Industrial automation control panels.
- PLC and electronic control equipment protection.
- Industrial monitoring and instrumentation systems.
- Remote telemetry and communication cabinets.
- Electrical distribution equipment operating within the specified voltage range.
- Industrial sensor and control networks.
- Building automation and monitoring installations.
- Utility and infrastructure control systems.
- Low-voltage equipment exposed to switching transients.
- Electrical panels requiring compact single-pole Type 2 surge protection.
- Maintenance and replacement of existing Finder 7P.21 surge protection devices.
