# BR-40 4P Type 2 40kA Surge Protective Device for TNS Systems
## Introduction to Surge Protection in TNS Systems
The BR-40 4P Type 2 40kA Surge Protective Device (SPD) is specifically designed for TNS (Terre-Neutral-Separé) electrical systems. These systems, commonly used in commercial and industrial applications, require robust protection against transient overvoltages that can damage sensitive equipment.
## Key Features of the BR-40 SPD
High Performance Protection
With a nominal discharge current (In) of 20kA per pole and a maximum discharge current (Imax) of 40kA, the BR-40 offers superior protection against electrical surges.
Four-Pole Design
The 4P configuration provides comprehensive protection for all phases and neutral in TNS systems, ensuring balanced protection across the entire electrical installation.
Type 2 Classification
As a Type 2 SPD, the BR-40 is designed for installation at the distribution board level, offering protection against indirect lightning strikes and switching transients.
## Technical Specifications
| Parameter | Value |
|---|---|
| Nominal Discharge Current (In) | 20kA (8/20μs) |
| Maximum Discharge Current (Imax) | 40kA (8/20μs) |
| Voltage Protection Level (Up) | <2.5kV |
| Response Time | <25ns |
| Operating Temperature | -40°C to +80°C |
## Installation and Application
The BR-40 is designed for easy installation in distribution boards with DIN rail mounting. It’s particularly suitable for:
- Commercial buildings
- Industrial facilities
- Data centers
- Healthcare facilities
Wiring Configuration
In TNS systems, the SPD should be connected between each phase and neutral, with the earth connection properly established according to local regulations and manufacturer guidelines.
## Maintenance and Monitoring
The BR-40 features a visual status indicator that shows the operational state of the device. Regular inspection is recommended to ensure continued protection:
- Check status indicators monthly
- Perform annual thermographic inspection
- Replace after significant surge events
## Conclusion
The BR-40 4P Type 2 40kA Surge Protective Device provides reliable protection for TNS electrical systems against transient overvoltages. Its robust design, high discharge capacity, and comprehensive protection make it an ideal choice for critical electrical installations where equipment protection is paramount.
For optimal protection, the BR-40 should be part of a coordinated surge protection strategy that may include Type 1 SPDs at the service entrance and Type 3 SPDs at equipment level.
