# 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 to safeguard electrical installations in TNS (Terre-Neutral-Separated) systems against transient overvoltages. These powerful surges can originate from various sources, including lightning strikes, switching operations, or electrical faults, potentially causing severe damage to sensitive equipment.
## Key Features of the BR-40 SPD
High-Performance Protection
The BR-40 offers an impressive 40kA (8/20μs) per phase protection level, making it suitable for installations where high surge currents are expected. Its robust design ensures reliable operation even under extreme conditions.
Four-Pole Configuration
With its 4P configuration, this SPD provides comprehensive protection across all phases and the neutral conductor in TNS systems. This complete coverage is essential for maintaining system integrity during surge events.
Type 2 Classification
As a Type 2 device, the BR-40 is designed for installation at the distribution board level, offering secondary protection following the main Type 1 SPD at the service entrance.
## Technical Specifications
- Nominal voltage: 230/400V AC
- Maximum continuous operating voltage (Uc): 320V
- Voltage protection level (Up): ≤1.5kV
- Response time: <25ns
- Operating temperature range: -40°C to +80°C
- Connection: 25mm² (max)
## Installation and Application
The BR-40 SPD is typically installed in parallel with the electrical distribution system, preferably at the main distribution board. Its compact design allows for easy DIN rail mounting (35mm), making it suitable for both new installations and retrofit applications.
This device finds particular application in:
- Commercial buildings
- Industrial facilities
- Data centers
- Healthcare institutions
- Any critical infrastructure using TNS earthing systems
## 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, with replacement necessary after significant surge events or as indicated by the status indicator.
Conclusion
The BR-40 4P Type 2 40kA Surge Protective Device provides reliable, high-performance protection for TNS systems against damaging transient overvoltages. Its robust construction, comprehensive protection features, and easy installation make it an excellent choice for safeguarding electrical installations in various environments.
