# 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-Neutre-Séparé) electrical systems, offering robust protection against transient overvoltages. In today’s increasingly electronic-dependent world, safeguarding electrical installations from power surges has become more critical than ever.
## 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 provides exceptional protection against lightning-induced surges and switching transients.
Four-Pole Design
The 4P configuration ensures comprehensive protection across all phases and neutral, making it ideal for three-phase TNS systems where complete overvoltage protection is required.
Type 2 Classification
As a Type 2 SPD, the BR-40 is designed for installation at the distribution board level, providing secondary protection when used in conjunction with Type 1 SPDs at the service entrance.
## Technical Specifications
- Nominal voltage: 230/400V AC
- Voltage protection level (Up): ≤ 1.5kV
- Response time: <25ns
- Operating temperature range: -40°C to +80°C
- Connection: 25mm² flexible conductors
- Mounting: DIN rail (35mm)
## Installation Considerations
System Compatibility
The BR-40 is specifically designed for TNS earthing systems, where the neutral and protective earth are separate throughout the distribution network. This design ensures optimal performance in such configurations.
Placement in the Electrical System
For maximum effectiveness, the SPD should be installed at the main distribution board, as close as possible to the incoming power supply. It should be protected by an appropriate overcurrent protection device as specified by the manufacturer.
Visual Status Indication
The device features clear visual indicators showing the operational status and end-of-life condition, allowing for easy maintenance checks.
## Benefits of Using the BR-40 SPD
By installing the BR-40 4P Type 2 SPD in your TNS system, you gain:
- Enhanced protection for sensitive electronic equipment
- Reduced downtime due to electrical damage
- Compliance with IEC 61643-11 and other relevant standards
- Long service life with reliable performance
- Cost-effective solution for surge protection
## Maintenance and Monitoring
While the BR-40 requires minimal maintenance, regular visual inspections are recommended to check the status indicators. The device should be replaced when it reaches its end-of-life condition or after a significant surge event.
For optimal system protection, consider integrating the BR-40 with other protective measures such as proper grounding and bonding, as well as point-of-use protection for particularly sensitive equipment.
