Why Choose the Finder 7P.43.8.275.1020 Type 2 Surge Protection Device?
The Finder 7P.43.8.275.1020 is a high-performance Type 2 three-pole surge protection device (SPD) designed to protect three-phase TN-C electrical installations against transient overvoltages caused by induced lightning surges and electrical switching disturbances. As part of the Finder 7P Series surge protection range, it combines metal oxide varistor technology with encapsulated gas discharge tubes to provide dependable protection for industrial electrical distribution and automation systems.
This surge arrester uses three combined varistor and spark gap protection elements, connected between the L1, L2 and L3 phase conductors and the PEN conductor. The series-connected protection technology provides high insulation resistance, minimises normal operating leakage current and prevents follow current after a surge event. Replaceable protection modules, visual status indication and an integrated remote signalling contact simplify maintenance and condition monitoring.
With a 230 V AC nominal phase-to-PEN voltage, a 275 V AC maximum continuous operating voltage and a 20 kA nominal discharge current, the Finder 7P.43.8.275.1020 is suitable for compatible three-phase TN-C power distribution systems. Its compact 53.8 mm width, IP20 protection rating and standard 35 mm DIN rail mounting enable straightforward installation inside electrical distribution boards and industrial control enclosures.
Key Advantages
- Reliable Type 2 surge protection for three-phase TN-C electrical installations.
- Three-pole protection configuration for L1, L2 and L3 to PEN connections.
- 275 V AC maximum continuous operating voltage suitable for compatible 230/400 V AC systems.
- 20 kA nominal discharge current for effective transient overvoltage protection.
- 25 kA maximum discharge current using an 8/20 µs surge waveform.
- 1.2 kV voltage protection level helps limit damaging transient voltages.
- Combined varistor and gas discharge tube technology minimises normal operating leakage current.
- No follow current after surge discharge improves protection performance.
- Integrated remote signalling contact supports external status monitoring.
- Replaceable surge protection modules simplify servicing and maintenance.
- Visual Healthy/Replace status indication enables convenient inspection.
- Compact 35 mm DIN rail-mounted construction supports space-efficient panel installation.
Key Features
- Finder 7P Series surge protection device.
- Type 2 three-pole surge arrester.
- TN-C earthing system compatibility.
- 230 V AC nominal phase-to-PEN voltage.
- 275 V AC maximum continuous operating voltage (Uc).
- 20 kA nominal discharge current (In, 8/20 µs).
- 25 kA maximum discharge current (Imax, 8/20 µs).
- 1.2 kV voltage protection level (Up).
- Three combined metal oxide varistor and encapsulated spark gap protection elements.
- High insulation resistance for negligible normal operating leakage current.
- No follow current after surge discharge.
- 1 CO (SPDT) remote signalling contact for protection status monitoring.
- 07P.01 remote signalling connector included.
- Replaceable protection modules with visual Healthy/Replace indication.
- IP20 protection rating for installation inside suitable electrical enclosures.
- Operating temperature range of −40 to +80 °C.
- 35 mm DIN rail mounting in accordance with EN 60715.
- Three-module construction with a width of approximately 53.8 mm.
- Designed for installation at the boundary between lightning protection zones LPZ 1 and LPZ 2.
- Complies with EN 61643-11:2012.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series Surge Protection Devices
- Model: 7P.43.8.275.1020
- Product type: Three-phase AC surge protection device with remote signalling
- SPD classification: Type 2
- Number of poles: 3
- Earthing system: TN-C
- Protection configuration: L1-PEN, L2-PEN, L3-PEN
- Protection technology: Combined metal oxide varistor and encapsulated gas discharge tube
- Nominal system voltage (Un): 230 V AC phase-to-PEN
- Maximum continuous operating voltage (Uc): 275 V AC
- Nominal discharge current (In, 8/20 µs): 20 kA
- Maximum discharge current (Imax, 8/20 µs): 25 kA
- Voltage protection level (Up): 1.2 kV
- Follow current: No follow current
- Maximum backup fuse rating: 160 A gG
- Short-circuit current rating (ISCCR): 35 kA with specified upstream protection
- Status indication: Visual Healthy/Replace indicator
- Remote signalling: Integrated changeover contact
- Remote contact configuration: 1 CO (SPDT)
- Remote signalling connector: 07P.01 included
- Protection modules: Replaceable
- Protection rating: IP20
- Operating temperature: −40 to +80 °C
- Mounting type: 35 mm DIN rail (EN 60715)
- Module width: 3 modules
- Dimensions (W × H × D): approximately 53.8 × 87.6 × 65.9 mm
- Terminal type: Screw terminals
- Applicable standard: EN 61643-11:2012
- EAN: 8012823423180
Reliable Surge Protection for Three-Phase Industrial Electrical Systems
Transient overvoltages can enter industrial electrical installations through incoming power supplies, distribution wiring and switching operations. Surge protection devices such as the Finder 7P.43.8.275.1020 help protect sensitive electrical equipment by diverting transient surge currents and limiting the voltage appearing across protected circuits. Its three-pole configuration provides protection between each phase conductor and the combined protective earth and neutral conductor in compatible TN-C systems.
The Finder 7P.43.8.275.1020 combines varistor and encapsulated spark gap technology to provide effective surge limitation without sustained follow current or significant normal operating leakage current. Its integrated remote signalling contact allows protection status to be monitored through compatible alarm, PLC or supervisory systems, while replaceable modules and visual condition indicators support preventative maintenance and dependable long-term operation.
Typical Applications
- Three-phase TN-C electrical distribution systems.
- Industrial electrical switchboards and distribution panels.
- Manufacturing machinery and production equipment.
- Industrial automation and control cabinets.
- Commercial and industrial 230/400 V AC power distribution.
- Motor control centres and industrial electrical infrastructure.
- Electrical installations requiring low-leakage Type 2 surge protection.
- Distribution systems requiring remote SPD status monitoring.
