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

# 25ka Surge Arrester 25GR 4P Type 1 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. This article explores its specifications, features, and applications in detail.

## Key Specifications

The 25GR 4P Type 1 surge arrester offers the following technical specifications:

• Nominal discharge current (In): 25kA
• Maximum discharge current (Imax): 50kA
• Voltage protection level (Up): ≤ 2.5kV
• Rated voltage (Uc): 255V AC
• Response time: < 25ns
• Number of poles: 4 (3 phases + neutral)
• Operating temperature range: -40°C to +80°C

## Main Features

Advanced Protection

The 25GR 4P Type 1 provides robust protection against direct lightning strikes (Type 1) and other high-energy surges. Its fast response time ensures minimal let-through voltage to protected equipment.

Durable Construction

Built with high-quality materials, this surge arrester features:

• Robust metal housing for mechanical protection
• Thermal disconnector for safe failure mode
• Visual status indicators for easy maintenance

Compliance and Certifications

The device meets international standards including:

• IEC 61643-11
• UL 1449
• CE marking

## Applications

The 25ka Surge Arrester 25GR 4P Type 1 is ideal for:

• Main distribution boards in commercial buildings
• Industrial power distribution systems
• Telecommunication facilities
• Data centers and critical infrastructure

## Installation Considerations

For optimal performance:

• Install at the service entrance or main distribution panel
• Ensure proper grounding with low-impedance connections
• Follow local electrical codes and regulations
• Consider pairing with Type 2 and Type 3 SPDs for complete protection

## Maintenance and Monitoring

The 25GR 4P Type 1 features:

• Visual status indicators for quick assessment
• Remote monitoring capability (optional)
• Recommended annual inspection by qualified personnel

## Conclusion

The 25ka Surge Arrester 25GR 4P Type 1 offers reliable protection against high-energy surges with its robust design and excellent technical specifications. Its Type 1 classification makes it suitable for installation at service entrances where protection against direct lightning strikes is required.