# BR-20 1+1 Type 2 20kA Surge Protective Device for TT and TNS Systems
## Introduction to Surge Protection
Electrical surges pose a significant threat to modern electrical systems and sensitive electronic equipment. The BR-20 1+1 Type 2 20kA Surge Protective Device (SPD) offers reliable protection against transient overvoltages in both TT and TNS earthing systems.
## Key Features of BR-20 SPD
High-Performance Protection
The BR-20 provides 20kA per pole (In) surge current capacity, making it suitable for installations requiring robust protection against lightning strikes and switching surges.
Versatile System Compatibility
This SPD is specifically designed to work with both TT and TNS earthing systems, offering flexibility for various electrical installations.
1+1 Protection Mode
The unique 1+1 configuration provides enhanced protection by combining two protection stages in a single device, improving reliability and performance.
## Technical Specifications
- Type: Type 2 SPD (according to IEC 61643-11)
- Nominal discharge current (In): 20kA (8/20μs) per pole
- Maximum discharge current (Imax): 40kA (8/20μs)
- Voltage protection level (Up): ≤ 1.5kV
- Response time: <25ns
- Operating temperature range: -40°C to +80°C
## Installation and Applications
Installation Guidelines
The BR-20 should be installed in parallel with the electrical system, preferably at the main distribution board. Proper earthing and correct phase connection are essential for optimal performance.
Typical Applications
- Commercial buildings
- Industrial facilities
- Residential complexes
- Telecommunication systems
- Data centers
## Maintenance and Monitoring
Regular visual inspection is recommended to check the status indicator. The BR-20 features a clear status display showing operational condition and end-of-life indication.
## Conclusion
The BR-20 1+1 Type 2 20kA Surge Protective Device provides comprehensive protection for electrical installations in TT and TNS systems. Its high discharge capacity, fast response time, and system versatility make it an excellent choice for safeguarding equipment against damaging electrical surges.
