Why Choose the Finder 7P.23.9.750.0020 Type 2 Photovoltaic Surge Protection Device?
The Finder 7P.23.9.750.0020 is a three-pole Type 2 photovoltaic DC surge protection device (SPD) designed to protect solar power installations against transient overvoltages caused by lightning-induced disturbances and electrical switching events. Part of the Finder 7P Series, this surge arrester incorporates three varistor protection elements and is specifically intended for photovoltaic systems operating at voltages up to 750 V DC.
Featuring a 20 kA nominal discharge current (In) and a 40 kA maximum discharge current (Imax), the Finder 7P.23.9.750.0020 provides defined surge-handling capability for photovoltaic DC circuits. Its Type 2 classification makes it suitable for protecting solar inverter inputs, photovoltaic string connections and DC distribution equipment against induced lightning surges and switching transients.
The device incorporates three replaceable metal oxide varistor modules, local visual status indication and a compact DIN rail-mounted housing. This particular variant is supplied without a remote signalling contact, making it suitable for installations where local inspection of the SPD is sufficient. Its IP20 construction and operating temperature range of −40 to +80 °C support installation in appropriately protected electrical enclosures.
Key Advantages
- Dedicated photovoltaic protection: Designed specifically for DC solar power installations.
- 750 V DC application rating: Supports appropriately designed photovoltaic systems operating within the specified voltage limits.
- Type 2 surge protection: Helps protect connected equipment against induced lightning surges and switching overvoltages.
- 20 kA nominal discharge current: Provides substantial surge-handling capability using the standard 8/20 µs waveform.
- 40 kA maximum discharge current: Offers additional capacity for high-amplitude transient surge events.
- Three-pole construction: Incorporates three varistor protection elements for photovoltaic DC protection arrangements.
- Replaceable varistor modules: Simplifies maintenance by allowing the appropriate protective elements to be replaced.
- Visual protection status indication: Enables straightforward inspection of the surge protection modules.
- Compact DIN rail design: Supports efficient integration into solar distribution enclosures.
- No remote signalling requirement: Suitable for installations where local status monitoring is preferred.
- Wide operating temperature range: Supports demanding electrical installation environments.
- IP20 protection: Suitable for mounting within appropriately rated electrical cabinets.
- Finder 7P Series construction: Provides a practical solution for maintaining photovoltaic electrical system protection.
Key Features
- Finder 7P Series photovoltaic surge protection device.
- 7P.23 product family.
- Type 2 surge protection classification.
- Designed for photovoltaic DC electrical systems.
- 750 V DC photovoltaic application voltage.
- Three-pole protection configuration.
- Three metal oxide varistor protection elements.
- 20 kA nominal discharge current (In), 8/20 µs.
- 40 kA maximum discharge current (Imax), 8/20 µs.
- Replaceable varistor cartridges.
- Local optical protection status indication.
- Version without integrated remote signalling.
- Standard 35 mm DIN rail mounting.
- Three-module construction.
- Approximate housing width of 53.8 mm.
- IP20 ingress protection.
- Operating temperature range of −40 to +80 °C.
- Suitable for installation in appropriately designed photovoltaic DC distribution enclosures.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Product family: 7P.23
- Model: 7P.23.9.750.0020
- Manufacturer part number: 7P.23.9.750.0020
- Product type: Photovoltaic DC surge protection device
- SPD classification: Type 2
- Application: Photovoltaic DC installations
- Photovoltaic voltage rating: 750 V DC
- Number of poles: 3
- Protection arrangement: Three varistors
- Protection technology: Metal oxide varistor
- Nominal discharge current (In, 8/20 µs): 20 kA
- Maximum discharge current (Imax, 8/20 µs): 40 kA
- Remote signalling: No
- Local status indication: Optical
- Protective elements: Replaceable varistor modules
- Mounting: 35 mm DIN rail
- Modular width: 3 modules
- Housing width: 53.8 mm
- Housing height: 89.6 mm
- Housing depth: 65.9 mm
- Ingress protection: IP20
- Operating temperature: −40 to +80 °C
- Maximum stated conductor cross-section: 25 mm²
- EAN: 8012823398099
- Country of origin: Czech Republic
Reliable Type 2 Surge Protection for Photovoltaic DC Systems
Photovoltaic installations are particularly exposed to transient electrical disturbances because solar panels and their associated DC cabling are commonly installed on rooftops or in open outdoor environments. Nearby lightning activity can induce substantial voltage surges in photovoltaic circuits, potentially affecting solar inverters, monitoring equipment and other connected electronic components. The Finder 7P.23.9.750.0020 is designed to help manage these disturbances through its Type 2 varistor-based protection arrangement.
The device incorporates three metal oxide varistors that respond to transient overvoltages by providing a surge current discharge path. Its 20 kA nominal discharge current indicates its capability under standardised 8/20 µs surge testing, while its 40 kA maximum discharge current provides an additional measure of surge-handling performance. These characteristics make it suitable for appropriately designed photovoltaic systems requiring secondary-stage surge protection.
Maintenance is supported by the replaceable varistor cartridges and local optical status indication. These features allow qualified personnel to inspect the condition of the protection elements and replace the appropriate modules when required. As this version does not include remote signalling, routine visual inspection should form part of the installation's maintenance programme.
For correct application, the photovoltaic array's maximum possible open-circuit voltage, including increases caused by low ambient temperatures, must be checked against the manufacturer's permitted operating limits. The SPD must also be coordinated with the installation's earthing arrangements, short-circuit protection, cable routing and other protective devices. The complete installation should follow Finder's technical instructions and the applicable photovoltaic electrical installation standards.
Typical Applications
- Residential photovoltaic systems: Surge protection for appropriately rated solar DC circuits.
- Commercial solar installations: Protection of photovoltaic array connections and inverter inputs.
- Industrial photovoltaic installations: Transient overvoltage protection within renewable energy infrastructure.
- Solar inverter DC inputs: Helping reduce exposure to lightning-induced electrical disturbances.
- Photovoltaic combiner boxes: Integration into suitable DC protection assemblies.
- Rooftop solar arrays: Protection of exposed photovoltaic cable networks.
- Ground-mounted solar installations: Type 2 surge protection for suitable PV string arrangements.
- Renewable energy control cabinets: DIN rail-mounted DC surge protection.
- Solar installation maintenance: Replacement or upgrading of compatible photovoltaic surge protection assemblies.
- Coordinated photovoltaic surge protection systems: Secondary-stage protection where required by the installation design.
