# BR-20 3+1 Type 2 20kA Surge Protective Device for TT and TNS Systems
## Introduction to Surge Protection
In today’s world of sensitive electronic equipment, surge protection has become an essential component of any electrical installation. The BR-20 3+1 Type 2 20kA Surge Protective Device (SPD) offers reliable protection against transient overvoltages for both TT and TNS earthing systems.
## Key Features of BR-20 3+1 SPD
The BR-20 3+1 Type 2 SPD boasts several impressive features:
– 20kA discharge capacity per phase (8/20μs)
– 3+1 protection mode configuration
– Suitable for both TT and TNS earthing systems
– Compact DIN rail mounting design
– Visual status indication
– Thermal disconnection for safety
## Technical Specifications
This high-performance SPD offers the following technical specifications:
- Nominal voltage: 230/400V AC
- Maximum continuous operating voltage (Uc): 320V AC
- Voltage protection level (Up): ≤1.5kV
- Response time: <25ns
- Operating temperature range: -40°C to +80°C
## Installation and Application
Installation Guidelines
The BR-20 3+1 SPD should be installed in the main distribution board as close as possible to the incoming power supply. It’s designed for DIN rail mounting and requires proper connection to the earth system according to the specific earthing arrangement (TT or TNS).
Typical Applications
This surge protective device is ideal for:
- Residential buildings
- Commercial installations
- Industrial facilities
- Telecommunication systems
## Why Choose BR-20 3+1 SPD?
The BR-20 3+1 Type 2 SPD stands out from competitors due to its:
- High discharge capacity for reliable protection
- Versatility in different earthing systems
- Compact design saving valuable panel space
- Clear visual status indication for easy maintenance
- Compliance with international standards
## Maintenance and Replacement
Regular inspection of the SPD is recommended to ensure proper functioning. The device features a visual indicator that shows when replacement is necessary. In case of severe surge events, the thermal disconnection feature ensures safe operation and prevents damage to the electrical system.
## Conclusion
The BR-20 3+1 Type 2 20kA Surge Protective Device provides comprehensive protection for electrical installations in both TT and TNS systems. Its robust design, high performance, and safety features make it an excellent choice for protecting sensitive equipment against damaging voltage surges.
