Why Choose the Finder 7P.62.9.009.0485 Type 2+3 RS485 Data Line Surge Protection Device?
The Finder 7P.62.9.009.0485 is a compact Type 2+3 surge protection device (SPD) specifically designed to protect RS485 communication networks, two-wire data lines and low-voltage signalling interfaces against transient overvoltages. Part of the Finder 7P Series, this specialised surge arrester combines coarse and fine surge suppression to help protect sensitive industrial communication equipment from lightning-induced disturbances and electrical switching transients.
Featuring a 6 V DC nominal voltage, an 8.5 V DC maximum continuous operating voltage (Uc) and a 5 kA nominal discharge current (In), the Finder 7P.62.9.009.0485 provides targeted protection for compatible RS485 data interfaces. Its protection arrangement addresses both longitudinal overvoltages (core-to-earth) and transverse overvoltages (core-to-core), helping reduce the risk of damage to communication transceivers, PLC interfaces, energy meters and industrial monitoring equipment.
With an ultra-slim 7 mm housing width, standard DIN rail mounting and an operating temperature range of −40 to +70 °C, the device is particularly suitable for space-constrained industrial control cabinets. Its serial connection arrangement also supports continuity of the communication cable shield, making it a practical solution for protecting two-wire RS485 networks without unnecessarily complicating the installation.
Key Advantages
- Dedicated RS485 surge protection: Specifically designed for industrial RS485 communication lines and compatible two-wire data networks.
- Combined Type 2+3 protection: Integrates coarse and fine surge suppression for sensitive data interfaces.
- 5 kA nominal discharge current: Provides defined surge-handling performance under the C2 8/20 µs test waveform.
- 8.5 V DC maximum operating voltage: Suitable for compatible low-voltage data and signalling circuits.
- Core-to-core protection: Helps limit differential transient voltages between the two signal conductors.
- Core-to-earth protection: Helps suppress common-mode surges affecting communication conductors relative to protective earth.
- Fast protection response: Designed to react rapidly to damaging transient overvoltages.
- Ultra-slim 7 mm construction: Minimises DIN rail space requirements in densely populated control panels.
- Shield continuity: Supports the connection of shielded two-wire communication cables.
- Serial installation: Enables protection to be incorporated directly into the communication cable path.
- PLC and inverter compatibility: Designed for suitable RS485 interfaces used by industrial controllers, inverters and energy meters.
- Wide temperature range: Suitable for industrial installations operating between −40 and +70 °C.
- IP20 enclosure protection: Appropriate for installation inside suitably protected electrical cabinets.
- DIN rail mounting: Simplifies integration into existing automation and electrical control assemblies.
- Finder engineering: Provides a dedicated surge protection solution from the established Finder 7P product range.
Key Features
- Finder 7P Series data and signal surge protection device.
- Product family: 7P.62.
- Type 2+3 surge protection classification for signal circuits.
- Designed for RS485 data lines and compatible two-wire telecommunications interfaces.
- Combination of coarse and fine surge suppression.
- Nominal operating voltage (Un): 6 V DC.
- Maximum continuous operating voltage (Uc): 8.5 V DC.
- Maximum nominal load current (IL): 0.5 A.
- C2 nominal discharge current (In): 5 kA, 8/20 µs, core-to-core.
- C2 total discharge current: 10 kA, 8/20 µs, cores-to-earth.
- Core-to-core voltage protection level: 18 V under C2 testing.
- Core-to-earth voltage protection level: 30 V under C2 testing.
- C3 core-to-core voltage protection level: 12 V.
- C3 core-to-earth voltage protection level: 15 V.
- Typical response time: 1 ns for core-to-core and core-to-earth protection.
- Serial resistance per conductor: 1.6 Ω.
- Specified core-to-core threshold frequency: 1 MHz.
- Supports shield continuity through the protective device.
- DIN rail-mounted construction.
- Compact 7 mm housing width.
- IP20 ingress protection.
- Operating temperature range: −40 to +70 °C.
- Designed in accordance with relevant EN/IEC 61643-21 data-line surge protection requirements.
Technical Specifications
- Manufacturer: Finder
- Series: 7P Series
- Product family: 7P.62
- Model: 7P.62.9.009.0485
- Manufacturer part number: 7P.62.9.009.0485
- Alternative reference: 7P6290090485
- Product type: Data and signal line surge protection device
- SPD classification: Type 2+3
- Protected interface: RS485
- Number of protected signal conductors: 2
- Protection modes: Core-to-core and core-to-earth
- Nominal voltage (Un): 6 V DC
- Maximum continuous operating voltage (Uc): 8.5 V DC
- Nominal load current (IL): 0.5 A
- C2 nominal discharge current (In, 8/20 µs), core-to-core: 5 kA
- C2 total discharge current (8/20 µs), cores-to-earth: 10 kA
- C2 voltage protection level (Up), core-to-core: 18 V
- C2 voltage protection level (Up), core-to-earth: 30 V
- C3 voltage protection level (Up), core-to-core at 1 kV/µs: 12 V
- C3 voltage protection level (Up), core-to-earth at 1 kV/µs: 15 V
- Response time, core-to-core: 1 ns
- Response time, core-to-earth: 1 ns
- Serial resistance per core: 1.6 Ω
- Threshold frequency, core-to-core: 1 MHz
- Connection arrangement: Serial, with shield continuity
- Mounting: 35 mm DIN rail
- Housing width: 7 mm
- Housing height: 91 mm
- Housing depth: 58 mm
- Maximum solid conductor cross-section: 4 mm²
- Maximum stranded conductor cross-section: 2.5 mm²
- Ingress protection: IP20
- Operating temperature: −40 to +70 °C
- Applicable standard: EN 61643-21 / IEC 61643-21
- Net weight: Approximately 34.06 g
- EAN: 8012823413341
- Country of origin: Czech Republic
Reliable Surge Protection for RS485 Industrial Communication Networks
RS485 communication networks are widely used in industrial automation, energy monitoring, building management and remote control systems. These networks often connect equipment across long cable runs, between separate cabinets or through electrically noisy industrial environments. Lightning-induced disturbances, switching operations and differences in electrical potential can produce transient overvoltages that threaten sensitive communication interfaces.
The Finder 7P.62.9.009.0485 addresses these risks through a combination of coarse and fine surge suppression. Its protection arrangement is designed to limit both differential surges between the two data conductors and common-mode surges between the conductors and protective earth. This dual-mode protection is particularly valuable for RS485 transceivers, where excessive voltage can damage communication circuitry or cause network interruptions.
The device has a 5 kA C2 nominal discharge current for core-to-core protection and a 10 kA total discharge current for the cores-to-earth path. Its specified voltage protection levels of 18 V core-to-core and 30 V core-to-earth under C2 testing help define the residual voltage presented during standardised surge conditions. The additional C3 performance characteristics support fine protection of sensitive communication electronics.
Unlike conventional mains surge protection devices, this model is designed specifically for low-voltage data signals. Its 8.5 V DC maximum continuous operating voltage and 0.5 A nominal load current must be compatible with the connected interface. The specified 1.6 Ω series resistance per conductor and signal frequency characteristics should also be considered when designing communication networks, particularly where long cable runs or higher data rates are involved.
The ultra-slim 7 mm DIN rail housing makes the device suitable for installation in densely populated control cabinets, while the provision for cable shield continuity supports correct treatment of shielded communication wiring. For effective protection, the device should be installed with suitable earthing, appropriate cable routing and connection methods in accordance with Finder's technical documentation and relevant electrical installation standards.
Typical Applications
- RS485 communication networks: Surge protection for compatible two-wire serial data connections.
- Industrial PLC systems: Protection of RS485 communication interfaces on programmable logic controllers.
- Solar inverter communications: Protection of compatible RS485 monitoring and control connections.
- Energy monitoring systems: Surge protection for electricity meters and data acquisition equipment.
- Building management systems: Protection of suitable serial communication links between controllers and field devices.
- SCADA installations: Protection of low-voltage communication interfaces used in supervisory monitoring.
- Industrial automation cabinets: Compact protection for serial data connections.
- Remote monitoring equipment: Surge protection for communication circuits serving distributed devices.
- Lift and elevator controls: Protection of compatible RS485 data connections.
- Road and tunnel lighting networks: Protection of suitable low-voltage serial communication systems.
- Industrial process control: Protection of communication links between sensors, controllers and monitoring equipment.
- Commercial electrical infrastructure: Protection of low-voltage data and signalling circuits.
