# BR-20 1+1 Type 2 20kA Surge Protective Device for TT and TNS Systems
## Introduction to Surge Protection
Surge protective devices (SPDs) play a critical role in safeguarding electrical systems from transient overvoltages caused by lightning strikes or switching operations. The BR-20 1+1 Type 2 20kA surge protective device offers reliable protection for both TT and TNS earthing systems, making it a versatile solution for various electrical installations.
## Key Features of BR-20 1+1 SPD
The BR-20 1+1 Type 2 surge protective device boasts several important features:
– 20kA discharge capacity per pole (Iimp)
– 1+1 protection mode (L-N and N-PE)
– Suitable for both TT and TNS earthing systems
– Compact design for easy installation
– Visual status indication
– Thermal disconnection for enhanced safety
## Technical Specifications
Understanding the technical parameters of the BR-20 SPD helps in proper selection and application:
Parameter | Value
Type | Type 2 (Class II)
Nominal discharge current (In) | 20kA (8/20μs)
Maximum discharge current (Imax) | 40kA (8/20μs)
Voltage protection level (Up) | ≤1.5kV
Response time | <25ns
Operating voltage | 230/400V AC
Operating temperature range | -40°C to +80°C
## Installation Considerations
Proper installation is crucial for optimal performance of the BR-20 SPD:
– Should be installed in parallel with the equipment to be protected
– Requires connection to the main distribution board
– Must be installed after the main circuit breaker
– Follow manufacturer’s guidelines for conductor sizing
– Ensure proper earthing connections
## Applications
The BR-20 1+1 Type 2 SPD finds application in various scenarios:
– Residential buildings
– Commercial establishments
– Industrial facilities
– Telecommunication systems
– Data centers
– Healthcare facilities
## Maintenance and Monitoring
Regular maintenance ensures continued protection:
– Periodic visual inspection of status indicators
– Check for any signs of physical damage
– Verify proper connection tightness
– Consider replacement after significant surge events
– Follow manufacturer’s recommended maintenance schedule
## Advantages Over Competitors
The BR-20 SPD offers several competitive advantages:
– Dual compatibility with TT and TNS systems
– Higher discharge capacity than many comparable devices
– Compact form factor saves panel space
– Reliable thermal disconnection mechanism
– Cost-effective protection solution
## Conclusion
The BR-20 1+1 Type 2 20kA surge protective device provides comprehensive protection for electrical installations in both TT and TNS earthing systems. Its robust design, high discharge capacity, and versatile application make it an excellent choice for safeguarding sensitive equipment against transient overvoltages. Proper selection, installation, and maintenance of this SPD will ensure long-term protection of your electrical infrastructure.
