# 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 protect TNS (Terre-Neutre-Séparé) electrical systems from damaging voltage surges. In today’s increasingly digital world, where sensitive electronic equipment is prevalent in both residential and commercial settings, reliable surge protection has become essential.
## Understanding TNS Electrical Systems
TNS systems are a common type of earthing arrangement where:
– The neutral and protective earth conductors are separate throughout the system
– The neutral is connected to earth at the source (transformer or generator)
– The protective earth conductor is connected to the consumer’s earth electrode
This configuration provides certain advantages but also requires specific considerations for surge protection.
## Key Features of the BR-40 4P SPD
The BR-40 4P Type 2 SPD offers several important features:
– 40kA maximum discharge current (Imax) per phase
– 4-pole design for comprehensive protection
– Specifically engineered for TNS system requirements
– Compact and easy-to-install design
– Visual status indicators for quick monitoring
– Thermal disconnector for enhanced safety
## Why Choose a Type 2 SPD?
Type 2 surge protective devices like the BR-40 4P serve as the main protection level for electrical installations:
– They are typically installed at distribution boards
– Designed to handle indirect lightning strikes and switching surges
– Coordinate with Type 1 SPDs (if present) and Type 3 SPDs
– Provide the primary defense for your electrical system
## Installation Considerations
Proper installation is crucial for optimal performance:
– Should be installed as close as possible to the distribution board
– Requires appropriate overcurrent protection
– Must be connected with conductors as short as possible
– Regular maintenance checks are recommended
– Should be replaced after significant surge events
## Benefits of the BR-40 4P for TNS Systems
This SPD offers specific advantages for TNS configurations:
– Balanced protection across all conductors
– Proper coordination with the separated neutral and earth system
– Reduced risk of equipment damage from surge events
– Compliance with relevant electrical safety standards
– Long-term cost savings by preventing damage to sensitive equipment
## Technical Specifications
Parameter | Value
Type | Type 2
System Compatibility | TNS
Number of Poles | 4
Maximum Discharge Current (Imax) | 40kA per phase
Nominal Discharge Current (In) | 20kA
Voltage Protection Level (Up) | <1.5kV
Response Time | <25ns
Operating Temperature Range | -40°C to +80°C
## Conclusion
The BR-40 4P Type 2 40kA Surge Protective Device provides reliable, high-performance protection for TNS electrical systems. Its robust design and specific compatibility with TNS configurations make it an excellent choice for safeguarding electrical installations against damaging voltage surges. By investing in proper surge protection, building owners and facility managers can significantly reduce the risk of equipment failure and downtime caused by electrical surges.
