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Lightning Protection: BR-40 4P Type 2 40kA Surge Protective Device for TNS Systems

In today’s technology-driven world, protecting electrical systems from lightning strikes and power surges is more critical than ever. The BR-40 4P Type 2 40kA Surge Protective Device (SPD) is specifically designed to safeguard TNS (Terra-Neutral-Separate) electrical systems against transient overvoltages caused by lightning or switching operations.

Understanding TNS Systems and Surge Protection

TNS systems are a common type of earthing arrangement where the neutral and protective earth conductors are separate throughout the installation. These systems require specialized surge protection to ensure optimal safety and equipment protection.

Key Features of the BR-40 4P SPD

The BR-40 4P Type 2 SPD offers several important features:

• 40kA discharge capacity per phase (I_max)
• Designed specifically for TNS systems
• 4-pole protection (L1, L2, L3, N)
• Type 2 classification according to IEC 61643-11
• Visual status indication for easy monitoring
• Thermal disconnection for safe failure mode

Installation and Application

The BR-40 4P is typically installed in the main distribution board of commercial and industrial facilities with TNS earthing systems. It provides secondary protection when used in conjunction with a Type 1 SPD at the service entrance.

Common applications include:

• Industrial plants
• Commercial buildings
• Data centers
• Hospital facilities
• Telecommunication installations

Why Choose the BR-40 4P for TNS Systems?

This surge protective device offers several advantages for TNS installations:

• Optimal protection for all four conductors in TNS systems
• High discharge capacity handles severe surge events
• Compact design for easy installation in standard distribution boards
• Reliable performance with minimal maintenance requirements

Technical Specifications

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