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25ka Surge Arrester 25GR 4P Type 1 Technical Specifications and Features

Introduction

The 25ka Surge Arrester 25GR 4P Type 1 is a high-performance surge protection device designed to safeguard electrical systems from transient overvoltages caused by lightning strikes or switching operations. This Type 1 arrester provides robust protection for main distribution panels and is suitable for installation at the service entrance of buildings.

Key Specifications

• Nominal Discharge Current (In): 25kA
• Maximum Discharge Current (Imax): 50kA
• Voltage Rating: 25GR (25kV)
• Poles: 4P (4-pole)
• Protection Level (Up): ≤ 4kV
• Response Time: <100ns
• Operating Temperature Range: -40°C to +80°C

Main Features

The 25GR 4P Type 1 surge arrester offers several advanced features:

Superior Protection

With its 25kA nominal discharge capacity, this arrester can handle large surge currents while maintaining excellent protection levels. The Type 1 classification indicates it’s designed to protect against direct lightning strikes.

Robust Construction

The device features a durable, weather-resistant housing suitable for both indoor and outdoor installations. Its compact design allows for easy mounting in standard electrical panels.

Visual Status Indication

Equipped with clear status indicators, the arrester provides immediate visual confirmation of its operational state, making maintenance checks quick and simple.

Thermal Disconnect

The built-in thermal disconnect feature ensures safe disconnection from the circuit in case of arrester failure, preventing potential fire hazards.

Applications

This surge arrester is ideal for:

• Main distribution boards in commercial buildings
• Industrial power distribution systems
• Service entrance protection
• Critical infrastructure facilities

Installation Notes

The 25GR 4P Type 1 arrester should be installed by qualified electricians in accordance with local electrical codes and standards. Proper grounding is essential for optimal performance. The device is typically installed between phase conductors and ground at the service entrance point.

Compliance and Standards

This surge protection device complies with:

• IEC 61643-11
• UL 1449 4th Edition
• EN 61643-11

For maximum system protection, it’s recommended to use this Type 1 arrester in combination with Type 2 and Type 3 devices downstream to create a comprehensive surge protection strategy.