# 25ka Surge Arrester 25GR 4P Type 1 Specifications and Features
## Introduction to 25ka Surge Arrester 25GR 4P Type 1
The 25ka Surge Arrester 25GR 4P Type 1 is a high-performance protective device designed to safeguard electrical systems from transient overvoltages caused by lightning strikes or switching surges. This surge arrester is specifically engineered for use in main distribution panels and service entrance applications, providing reliable protection for sensitive equipment.
## Key Specifications
The 25GR 4P Type 1 surge arrester boasts impressive technical specifications that make it suitable for demanding electrical environments:
- Nominal Discharge Current (In): 25kA
- Maximum Discharge Current (Imax): 100kA
- Voltage Protection Level (Up): 2.5kV
- Rated Voltage (Uc): 320V AC
- Response Time: <100ns
- Number of Poles: 4 (3 phases + neutral)
- Operating Temperature Range: -40°C to +85°C
## Main Features
Advanced Protection Technology
The 25GR 4P Type 1 incorporates state-of-the-art metal oxide varistor (MOV) technology that provides fast response to voltage surges while maintaining excellent energy absorption capabilities.
Robust Construction
Designed for durability, this surge arrester features a rugged housing that resists environmental factors including moisture, dust, and mechanical stress.
Visual Status Indication
The device includes a clear status window that shows whether the protection is active or if the unit requires replacement, ensuring easy maintenance.
Thermal Disconnect Protection
Built-in thermal protection automatically disconnects the arrester from the circuit in case of overheating, preventing potential fire hazards.
## Applications
The 25ka Surge Arrester 25GR 4P Type 1 is ideal for various applications including:
- Main service entrance panels
- Industrial power distribution systems
- Commercial buildings
- Telecommunication facilities
- Data centers
## Installation Considerations
Mounting Requirements
The surge arrester should be installed as close as possible to the service entrance, preferably within 10 feet of the main distribution panel.
Wiring Specifications
Use appropriate gauge wiring with minimal bends and keep lead lengths as short as possible to maximize protection effectiveness.
Grounding Requirements
A proper low-impedance ground connection is essential for optimal performance. The grounding conductor should be as short and straight as possible.
## Compliance and Certifications
The 25GR 4P Type 1 surge arrester meets or exceeds the following standards:
- UL 1449 4th Edition
- IEC 61643-11
- CE Marking
- RoHS Compliant
## Maintenance and Service Life
While the 25GR 4P Type 1 is designed for long-term reliability, regular inspection is recommended. The
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