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

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

## Introduction to Surge Protection

Surge arresters play a critical role in protecting electrical systems from voltage spikes and transient overvoltages. The 25ka Surge Arrester 25GR 4P Type 1 is specifically designed to provide robust protection for industrial and commercial applications where high surge current capacity is required.

## Key Specifications

Electrical Characteristics

The 25GR 4P Type 1 arrester features a nominal discharge current of 25kA (8/20μs), making it suitable for installations requiring high surge protection levels. It offers a maximum continuous operating voltage (Uc) of 320V AC and a voltage protection level (Up) of ≤1.5kV.

Mechanical Properties

This four-pole surge protector measures approximately 90mm × 72mm × 65mm and weighs about 0.5kg. Its compact design allows for easy installation in standard distribution panels while maintaining excellent thermal performance.

## Performance Features

Type 1 Classification

As a Type 1 surge arrester, the 25GR 4P is designed to protect against direct lightning strikes and can handle partial lightning current (10/350μs waveform). This makes it ideal for installation at the service entrance of buildings.

Advanced Protection Technology

The arrester utilizes high-quality metal oxide varistors (MOVs) that provide fast response times (<25ns) and excellent energy absorption capabilities. Its thermal disconnector ensures safe operation by disconnecting the unit in case of overload.

## Installation and Applications

Mounting Requirements

The 25GR 4P should be installed in parallel with the electrical system, preferably at the main distribution board. It requires a 35mm DIN rail for mounting and should be connected using conductors with a minimum cross-section of 6mm².

Typical Applications

This surge arrester is commonly used in:

• Industrial power distribution systems
• Commercial buildings
• Telecommunication facilities
• Data centers
• Medical facilities with sensitive equipment

## Maintenance and Indicators

Visual Status Indicators

The device features a clear window with color-coded status indicators (green for normal operation, red for fault condition). This allows for quick visual inspection without the need for specialized equipment.

Maintenance Requirements

While the arrester requires minimal maintenance, periodic visual inspections are recommended, especially after significant electrical storms. The unit should be replaced immediately if the fault indicator shows red or if there are any signs of physical damage.

## Compliance and Standards

The 25ka Surge Arrester 25GR 4P Type 1 complies with international standards including IEC 61643-11 and EN 61643-11. It has been tested and certified by recognized testing laboratories for safety and performance.