# BR-20 4P Type 2 20kA Surge Protective Device for TNS Systems
## Introduction to Surge Protection in TNS Systems
The BR-20 4P Type 2 20kA Surge Protective Device (SPD) is specifically designed to protect electrical installations in TNS (Terre-Neutre-Séparé) systems from transient overvoltages. These systems, commonly used in European electrical distribution networks, require specialized protection against lightning strikes and switching surges that can damage sensitive equipment.
## Key Features of the BR-20 4P SPD
High-Performance Protection
With a nominal discharge current (In) of 20kA per pole, the BR-20 4P offers robust protection against electrical surges. Its Type 2 classification ensures it can handle indirect lightning strikes and major switching operations in the electrical network.
Four-Pole Design
The 4P configuration provides comprehensive protection for all phases and the neutral conductor in TNS systems. This complete coverage is essential for maintaining system integrity during surge events.
Thermal Disconnection
Built-in thermal protection automatically disconnects the SPD from the circuit if it becomes overloaded, preventing potential fire hazards and ensuring safe operation.
## Technical Specifications
| Parameter | Value |
|---|---|
| Nominal Discharge Current (In) | 20kA (8/20μs) |
| Maximum Discharge Current (Imax) | 40kA (8/20μs) |
| Voltage Protection Level (Up) | ≤ 1.5kV |
| Response Time | < 25ns |
| Operating Temperature | -40°C to +80°C |
## Installation and Application
Ideal Installation Locations
The BR-20 4P is typically installed in the main distribution board of commercial and industrial buildings using TNS earthing systems. It serves as the primary protection against external surges entering the building’s electrical system.
Compatibility
This SPD is compatible with various electrical systems operating at 230/400V AC and is particularly effective in TNS configurations where the neutral and protective earth are separate throughout the system.
Visual Status Indicators
Clear LED indicators provide immediate visual confirmation of the device’s operational status, allowing for quick assessment during routine maintenance checks.
## Maintenance and Replacement
Regular inspection of the BR-20 4P SPD is recommended to ensure continued protection. The device features a wear indicator that shows when replacement is necessary, typically after significant surge events or at the end of its service life.
When replacing the unit, it’s important to follow manufacturer guidelines and ensure the new SPD has matching technical specifications to maintain the same level of protection.
## Conclusion
The BR-20 4P Type 2 20kA Surge Protective Device offers reliable protection for TNS systems against damaging electrical surges. Its robust design, high discharge capacity, and comprehensive four-pole protection make it an essential component for safeguarding electrical installations in commercial and industrial environments.
By implementing this SPD in your TNS system, you
