# 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 for TNS (Terre-Neutral-Separate) electrical distribution systems. These systems are commonly used in commercial and industrial applications where reliable surge protection is essential for safeguarding sensitive electronic equipment.
## Key Features of the BR-20 SPD
High-Performance Protection
The BR-20 offers 20kA per phase protection capacity, making it suitable for areas with medium to high lightning exposure. Its Type 2 classification indicates it’s designed for installation at the distribution board level.
Four-Pole Design
With its 4P configuration, the device provides comprehensive protection across all phases and neutral, ensuring complete system coverage in TNS installations.
Advanced Thermal Protection
The SPD includes built-in thermal disconnectors that automatically isolate the device if it becomes overloaded, preventing potential fire hazards.
## Installation and Compatibility
Proper Installation Guidelines
The BR-20 should be installed by qualified electricians in accordance with local electrical codes and manufacturer recommendations. Key installation points include:
- Mounting at the origin of the electrical installation
- Proper connection to the earth electrode system
- Adequate cable sizing for the protected circuits
TNS System Compatibility
This SPD is specifically engineered for TNS systems where the neutral and protective earth are separate throughout the distribution network. It provides optimal protection for this configuration by addressing the unique voltage reference points in TNS systems.
## Technical Specifications
| Parameter | Value |
|---|---|
| Nominal Voltage (Un) | 230/400V AC |
| Maximum Continuous Operating Voltage (Uc) | 320V AC |
| Nominal Discharge Current (In) | 20kA (8/20μs) |
| Protection Level (Up) | ≤ 1.5kV |
| Response Time | < 25ns |
## Maintenance and Monitoring
Visual Status Indicators
The BR-20 features clear visual indicators that show the operational status of the device, allowing for quick inspection and maintenance checks.
End-of-Life Indication
When the SPD reaches its maximum surge capacity, the indicator will show that replacement is required, ensuring continuous protection of the electrical system.
## Conclusion
The BR-20 4P Type 2 20kA Surge Protective Device provides reliable protection for TNS systems against transient overvoltages caused by lightning strikes and switching operations. Its robust design and comprehensive protection features make it an excellent choice for safeguarding electrical installations in commercial and industrial environments.
For optimal performance, always ensure proper installation by qualified professionals and regular maintenance checks to verify the device’s operational status.
