# BR-20 3+1 Type 2 20kA Surge Protective Device for TT and TNS Systems
## Introduction to Surge Protection
In today’s electrical infrastructure, protecting sensitive equipment from power surges is crucial. The BR-20 3+1 Type 2 20kA surge protective device offers robust protection for both TT and TNS earthing systems, ensuring your electrical installations remain safe from transient overvoltages.
## Key Features of BR-20 3+1 SPD
The BR-20 3+1 Type 2 surge protective device stands out with its impressive specifications:
– 20kA discharge capacity per phase (Iimp)
– 3+1 protection mode configuration
– Suitable for both TT and TNS earthing systems
– Compact DIN rail mounting design
– Visual status indication for easy monitoring
## Technical Specifications
Parameter | Value
Type | Type 2 (Class II)
Nominal Discharge Current (In) | 20kA
Maximum Discharge Current (Imax) | 40kA
Voltage Protection Level (Up) | <1.5kV
Response Time | <25ns
Operating Voltage | 230/400V AC
## Installation and Applications
The BR-20 3+1 SPD is designed for easy installation in distribution boards, featuring standard DIN rail mounting. Its universal compatibility makes it ideal for:
– Residential buildings
– Commercial facilities
– Industrial installations
– Data centers
– Telecommunication systems
## Protection Mechanism
This surge protective device utilizes advanced varistor technology to divert dangerous surge currents away from sensitive equipment. The 3+1 configuration provides comprehensive protection between:
– Phase-to-neutral (3 paths)
– Neutral-to-earth (1 path)
This arrangement ensures complete protection regardless of the earthing system configuration (TT or TNS).
## Maintenance and Monitoring
The BR-20 features clear visual indicators showing the operational status:
– Green LED: Device operational
– Red LED: End-of-life indication (requires replacement)
Regular inspection is recommended to ensure continuous protection, especially after significant electrical events.
## Compliance and Standards
This surge protective device complies with:
– IEC 61643-11
– EN 61643-11
– CE marking
– RoHS directive
## Conclusion
The BR-20 3+1 Type 2 20kA surge protective device offers reliable, high-performance protection for electrical installations using TT or TNS earthing systems. Its robust design, high discharge capacity, and universal compatibility make it an excellent choice for safeguarding sensitive equipment against damaging power surges.
