Why Choose the Finder 7P.25.8.150.0015 Type 2 Three-Phase Surge Protection Device?
The Finder 7P.25.8.150.0015 is a Type 2 four-pole surge protection device (SPD) designed to protect compatible three-phase electrical installations against transient overvoltages caused by lightning-induced disturbances and electrical switching operations. Part of the Finder 7P Series, this surge arrester features a 3+N configuration with four metal oxide varistor protection elements, making it suitable for three-phase TN-S electrical systems with a neutral conductor.
Featuring a 150 V AC voltage rating and a 20 kA nominal discharge current (In), the Finder 7P.25.8.150.0015 provides transient overvoltage protection for appropriately rated low-voltage electrical systems. Its four-varistor construction protects the three phase conductors and neutral-to-earth path, helping reduce the risk of surge-related damage to electrical distribution equipment and sensitive electronic components.
The device incorporates replaceable varistor modules, visual protection status indication, IP20 ingress protection and standard 35 mm DIN rail mounting. This specific .0015 version is supplied without an integrated remote signalling contact, making it suitable for electrical installations where local visual inspection is sufficient.
Key Advantages
- Type 2 surge protection against induced lightning overvoltages and switching transients.
- Four-pole 3+N configuration for compatible three-phase TN-S electrical systems.
- 150 V AC voltage rating for appropriately rated electrical installations.
- 20 kA nominal discharge current with an 8/20 µs surge waveform.
- Four metal oxide varistor protection elements provide coordinated protection of phase and neutral conductors.
- Replaceable varistor cartridges simplify maintenance and servicing.
- Visual protection status indicators allow straightforward inspection of module condition.
- 35 mm DIN rail mounting enables convenient installation in electrical distribution boards.
- IP20 protection for use within suitable electrical enclosures.
- −40 to +80 °C operating temperature range supports demanding environments.
- Helps protect sensitive control electronics and electrical equipment from transient voltage disturbances.
- Suitable for coordinated surge protection arrangements in industrial and commercial electrical systems.
- Modular construction reduces the need to replace the entire SPD assembly during routine maintenance.
- Part of Finder's established 7P Series electrical surge protection range.
Key Features
- Finder 7P Series surge protection device.
- 7P.25 three-phase TN-S surge arrester family.
- Type 2 SPD classification.
- 3+N protection configuration with four varistor elements.
- TN-S electrical system compatibility.
- 150 V AC rated voltage.
- 20 kA nominal discharge current (In).
- 8/20 µs nominal discharge current waveform.
- Metal oxide varistor (MOV) protection technology.
- Protection paths: L1–PE, L2–PE, L3–PE and N–PE.
- Replaceable varistor modules.
- Visual healthy/replacement status indication.
- No integrated remote signalling contact on the .0015 variant.
- IP20 ingress protection.
- −40 to +80 °C operating temperature range.
- 35 mm DIN rail mounting according to EN 60715.
- Designed for installation within suitable low-voltage electrical distribution equipment.
- Surge protection device design according to EN/IEC 61643-11.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Product family: 7P.25
- Model: 7P.25.8.150.0015
- Product type: Three-phase surge protection device
- SPD classification: Type 2
- Number of poles: 4
- Protection configuration: 3+N
- Compatible earthing arrangement: TN-S
- Protection technology: Metal oxide varistor (MOV)
- Number of varistor protection elements: 4
- Protection paths: L1–PE, L2–PE, L3–PE and N–PE
- Rated voltage: 150 V AC
- Nominal discharge current (In): 20 kA
- Nominal discharge current waveform: 8/20 µs
- Protection modules: Replaceable varistor cartridges
- Local status indication: Visual varistor condition indicator
- Remote signalling contact: Not included
- Operating temperature: −40 to +80 °C
- Ingress protection: IP20
- Mounting: 35 mm DIN rail
- Mounting standard: EN 60715
- Installation: Suitable electrical distribution board or protective enclosure
- Relevant standard: EN/IEC 61643-11
- EAN: 8012823453422
- Manufacturer part number: 7P.25.8.150.0015
Four-Varistor Type 2 Surge Protection for TN-S Systems
The Finder 7P.25.8.150.0015 uses four metal oxide varistors to provide transient overvoltage protection in compatible three-phase TN-S electrical installations. Unlike a 3+1 arrangement that uses a gas discharge element between neutral and protective earth, the 7P.25 configuration uses varistor protection for the phase conductors and neutral-to-earth path.
During normal operation, the varistors present high electrical resistance. When a transient overvoltage occurs, their resistance decreases rapidly, allowing surge current to be diverted through the protective earthing system. This helps limit the voltage stress experienced by connected electrical equipment.
With a 20 kA nominal discharge current, the device is designed for Type 2 protection against induced lightning surges and switching disturbances. It is suitable for installation at the boundary between lightning protection zones LPZ 1 and LPZ 2, or other locations selected through an appropriate electrical surge protection assessment.
Replaceable Modules and Convenient Electrical Panel Installation
The Finder 7P.25.8.150.0015 incorporates replaceable varistor cartridges, allowing individual protection elements to be renewed when their operational condition indicates that replacement is required. This modular arrangement helps simplify maintenance and avoids unnecessary replacement of the complete surge protection device.
Visual indicators provide local information about the condition of the protective modules. The 7P.25.8.150.0015 is the version without an integrated remote signalling contact. For installations requiring remote monitoring, the corresponding 7P.25.8.150.1015 variant provides remote status signalling.
The device is designed for installation on a standard 35 mm DIN rail within a suitable electrical enclosure. Before installation, engineers must confirm that the electrical system voltage, TN-S earthing arrangement, surge protection requirements and upstream overcurrent protection are compatible with the selected device. The 150 V AC version must not be substituted for a 275 V AC model without verifying the electrical installation requirements.
Typical Applications
- Three-phase TN-S electrical distribution systems.
- Industrial electrical switchboards.
- Commercial building distribution panels.
- Low-voltage electrical installations requiring 150 V AC-rated surge protection.
- Industrial automation and PLC control cabinets.
- Machinery electrical protection assemblies.
- Control system power distribution equipment.
- Building management and electrical infrastructure systems.
- Electrical installations exposed to switching transients.
- Secondary-stage surge protection in coordinated electrical systems.
- OEM switchgear and electrical control assemblies.
- Maintenance and replacement of modular surge protection equipment.
