# Lightning Protection: BR-20 4P Type 2 20kA Surge Protective Device for TNS Systems
## Introduction to Surge Protection
In today’s world, where electrical systems power our homes, businesses, and critical infrastructure, protecting these systems from power surges is more important than ever. The BR-20 4P Type 2 20kA Surge Protective Device (SPD) offers robust protection specifically designed for TNS (Terre-Neutral-Separé) electrical systems.
## Understanding TNS Systems
TNS systems are a common type of earthing arrangement where:
– The neutral and earth conductors are separate throughout the system
– The earth connection is provided by a separate conductor from the supply transformer
– This arrangement offers certain advantages in terms of safety and fault protection
## Features of the BR-20 4P Type 2 SPD
The BR-20 4P Type 2 20kA surge protective device provides comprehensive protection with these key features:
– 4-pole design for complete protection of all conductors
– Type 2 classification according to IEC 61643-11
– 20kA nominal discharge current (In) per phase
– Compact design for easy installation
– Visual status indicators for quick monitoring
– Thermal disconnectors for enhanced safety
## Why Choose This SPD for TNS Systems?
The BR-20 4P is particularly well-suited for TNS systems because:
– It protects both phase and neutral conductors
– The separate earth connection in TNS systems requires specific protection considerations
– It maintains system safety while providing effective surge protection
– The 4-pole design matches the configuration of TNS systems
## Installation Considerations
When installing the BR-20 4P Type 2 SPD in a TNS system:
– Always follow manufacturer instructions and local electrical codes
– Ensure proper connection to all conductors (L1, L2, L3, N)
– Verify the earth connection is properly established
– Consider upstream protection requirements
– Position the SPD as close as possible to the equipment being protected
## Performance Specifications
Technical specifications of the BR-20 4P Type 2 20kA SPD include:
– Maximum continuous operating voltage: 275V AC
– Voltage protection level (Up): ≤ 1.5kV
– Response time: < 25ns
– Operating temperature range: -40°C to +80°C
– IP20 enclosure rating
## Maintenance and Monitoring
To ensure ongoing protection:
– Regularly check the status indicators
– Monitor for any signs of thermal stress
– Replace the SPD after a significant surge event
– Consider periodic testing as part of your electrical maintenance program
The BR-20 4P Type 2 20kA Surge Protective Device provides reliable protection for TNS electrical systems against damaging power surges. Its specific design for 4-pole applications makes it an ideal choice for installations using the TNS earthing arrangement, offering both safety and performance in surge protection applications.
