# 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 electronic equipment and power distribution systems. 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
With a nominal discharge current (In) of 20kA per mode, the BR-20 provides robust protection against lightning-induced surges and switching transients. Its 1+1 configuration offers protection between live conductors and earth.
Versatile System Compatibility
Designed specifically for TT and TNS earthing systems, this Type 2 SPD ensures optimal performance across different electrical installations. The device automatically adapts to the system configuration without requiring manual adjustments.
## Technical Specifications
- Type: 2 (Class II)
- 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 Range: -40°C to +80°C
## Installation and Application
Installation Guidelines
The BR-20 should be installed in parallel with the electrical system at the main distribution board. Proper earthing is essential for optimal performance. The device features visual status indicators for easy monitoring of its operational state.
Typical Applications
This SPD is ideal for protecting:
- Residential and commercial buildings
- Industrial facilities
- Telecommunication systems
- Data centers
- Medical equipment installations
## Advantages Over Conventional SPDs
The BR-20 offers several improvements over standard surge protection devices:
- Enhanced thermal protection with automatic disconnection
- Compact design for space-efficient installation
- High energy handling capacity
- Low let-through voltage for better equipment protection
- Durable construction for long service life
## Maintenance and Monitoring
Regular inspection of the BR-20 is recommended to ensure continued protection. The device features a clear status window showing:
- Green: Normal operation
- Red: End-of-life indication
No routine maintenance is required under normal operating conditions.
## 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 performance, reliability, and ease of installation make it an excellent choice for safeguarding sensitive equipment against damaging voltage surges.
