# BR-40 2P Type 2 40kA Surge Protective Device for TNS Systems
## Introduction to Surge Protection
In today’s world of sensitive electronic equipment, surge protection has become an essential component of any electrical installation. The BR-40 2P Type 2 40kA Surge Protective Device (SPD) offers reliable protection for TNS (Terra Neutral Separate) systems against transient overvoltages caused by lightning strikes or switching operations.
## Key Features of BR-40 2P SPD
High Performance Protection
The BR-40 2P provides a nominal discharge current (In) of 20kA per pole and a maximum discharge current (Imax) of 40kA, making it suitable for protecting electrical installations in areas with medium lightning exposure.
Compact Design
With its 2-pole configuration, this Type 2 SPD is designed for easy installation in distribution boards, offering space-saving protection without compromising performance.
Visual Status Indication
The device features clear visual indicators to show the operational status, allowing for quick and easy maintenance checks.
## Technical Specifications
- Type: 2 (Class II)
- Nominal Discharge Current (In): 20kA (10/350μs)
- Maximum Discharge Current (Imax): 40kA (8/20μs)
- Voltage Protection Level (Up): ≤1.5kV
- Nominal Voltage (Un): 230V AC
- Response Time: <25ns
- Connection: 2P (L-N)
- Operating Temperature: -40°C to +80°C
## Installation Guidelines
System Compatibility
The BR-40 2P is specifically designed for TNS (TN-S) earthing systems, where the neutral and protective earth conductors are separate throughout the system.
Mounting Position
Install the SPD in parallel with the equipment to be protected, preferably at the origin of the installation or at sub-distribution boards.
Wiring Requirements
Use short and straight connections to minimize inductive effects, with cross-sectional area according to local regulations (typically 4-6mm²).
## Maintenance and Replacement
Regular inspection of the status indicator is recommended. The device should be replaced when the indicator shows end-of-life status or after a significant surge event.
## Conclusion
The BR-40 2P Type 2 40kA Surge Protective Device offers robust protection for TNS systems, combining high performance with user-friendly features. Its compact design and clear status indication make it an excellent choice for protecting electrical installations against transient overvoltages.
