# BR-20 3+1 Type 2 20kA Surge Protective Device for TT and TNS Systems
## Introduction to Surge Protection
Electrical surges can cause significant damage to sensitive equipment and disrupt operations in both residential and commercial settings. The BR-20 3+1 Type 2 20kA Surge Protective Device (SPD) offers reliable protection against these potentially destructive power surges, specifically designed for TT and TNS earthing systems.
## Key Features of the BR-20 SPD
High Performance Protection
The BR-20 provides 20kA per phase surge protection capacity, making it suitable for most commercial and industrial applications where robust protection is required.
3+1 Configuration
This unique configuration offers protection between:
- Phase to Neutral (L-N)
- Phase to Earth (L-PE)
- Neutral to Earth (N-PE)
Compatibility with TT and TNS Systems
The device is specifically engineered to work effectively with both TT and TNS earthing arrangements, providing flexibility in various electrical installations.
## Technical Specifications
| Parameter | Value |
|---|---|
| Nominal Voltage (Un) | 230/400V AC |
| Maximum Continuous Operating Voltage (Uc) | 320V AC |
| Nominal Discharge Current (In) | 10kA (8/20μs) |
| Maximum Discharge Current (Imax) | 20kA (8/20μs) |
| Voltage Protection Level (Up) | ≤1.5kV |
## Installation and Application
Installation Guidelines
The BR-20 should be installed in parallel with the electrical system, preferably at the main distribution board. Proper earthing is essential for optimal performance.
Typical Applications
- Commercial buildings
- Industrial facilities
- Data centers
- Telecommunication installations
- Residential complexes
## Benefits of Using BR-20 SPD
The BR-20 3+1 Type 2 SPD offers several advantages:
- Comprehensive protection for all modes (L-N, L-PE, N-PE)
- High surge current capacity (20kA)
- Visual status indication for easy maintenance
- Thermal disconnection for enhanced safety
- Compact design for space-efficient installation
## Conclusion
The BR-20 3+1 Type 2 20kA Surge Protective Device provides reliable and robust protection for electrical systems using TT or TNS earthing arrangements. Its high performance characteristics and flexible configuration make it an excellent choice for safeguarding sensitive equipment against damaging power surges in various applications.
