# 25ka Surge Arrester 25GR 4P Type 1 Specifications and Features
Keyword: 25ka surge arrester 25gr 4p type 1
## Introduction to Surge Protection
Surge arresters play a critical role in protecting electrical systems from voltage spikes caused by lightning strikes or power surges. The 25ka Surge Arrester 25GR 4P Type 1 is 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 surge arrester offers:
- Nominal discharge current (In): 25kA
- Maximum discharge current (Imax): 50kA
- Voltage protection level (Up): ≤ 2.5kV
- Rated voltage (Uc): 275V AC
- Response time: <25ns
Mechanical Specifications
This arrester features:
- 4-pole design for comprehensive protection
- Compact DIN rail mounting
- Operating temperature range: -40°C to +80°C
- IP20 protection rating
- Visual status indicators
## Advanced Features
Type 1 Protection
As a Type 1 surge protective device, this arrester is specifically designed to handle direct lightning strikes, making it ideal for installation at the service entrance of buildings or facilities.
Thermal Disconnector
The built-in thermal disconnector ensures safe operation by automatically disconnecting the device from the circuit in case of overheating or end-of-life condition.
Remote Signaling
Optional remote signaling contacts are available for integration with monitoring systems, allowing for proactive maintenance and system status checks.
## Installation and Applications
Installation Guidelines
The 25GR 4P Type 1 should be installed:
- At the main distribution board
- As close as possible to the service entrance
- With proper grounding connections
- In coordination with downstream protection devices
Typical Applications
This surge arrester is suitable for:
- Industrial plants
- Commercial buildings
- Telecommunication facilities
- Data centers
- Medical facilities
## Compliance and Standards
The 25ka Surge Arrester 25GR 4P Type 1 complies with:
- IEC 61643-11
- UL 1449 4th Edition
- EN 61643-11
- CE Marking
## Conclusion
The 25ka Surge Arrester 25GR 4P Type 1 provides superior protection against transient overvoltages with its high discharge capacity and robust construction. Its Type 1 classification makes it an essential component for comprehensive lightning protection systems in demanding environments.