# 25kV Surge Arrester 25GR 4P Type 1 Specifications and Features
## Introduction to 25kV Surge Arresters
Surge arresters play a critical role in protecting electrical systems from voltage spikes and transient overvoltages. The 25kV Surge Arrester 25GR 4P Type 1 is specifically designed to safeguard medium voltage equipment in demanding industrial and utility applications.
## Key Specifications
Electrical Characteristics
The 25GR 4P Type 1 surge arrester features:
- Rated voltage: 25kV
- Maximum continuous operating voltage: 20.5kV
- Nominal discharge current: 10kA
- Line discharge class: 4
- Pressure relief class: High
Mechanical Specifications
This arrester model includes:
- Housing material: Polymer
- Creepage distance: ≥25mm/kV
- Weight: Approximately 8.5kg
- Mounting: Vertical or horizontal
## Performance Features
Advanced Protection
The 25GR 4P Type 1 provides superior protection with:
- Fast response time (<100ns)
- Excellent energy absorption capability
- Low residual voltage characteristics
- High thermal stability
Environmental Resistance
Designed for harsh conditions, this arrester offers:
- UV-resistant polymer housing
- Corrosion-resistant metal parts
- Operation temperature range: -40°C to +60°C
- Pollution resistance up to Heavy (Class IV)
## Applications
The 25kV 25GR 4P Type 1 surge arrester is ideal for:
- Medium voltage power distribution systems
- Industrial plant electrical networks
- Renewable energy installations
- Railway electrification systems
- Substation protection
## Compliance and Standards
This surge arrester complies with:
- IEC 60099-4
- ANSI/IEEE C62.11
- Type 1 classification per IEC standards
- Various national and regional electrical codes
## Maintenance and Service Life
The 25GR 4P Type 1 requires minimal maintenance and offers:
- Sealed, maintenance-free design
- Visual condition indicators
- Typical service life of 25+ years
- Optional monitoring devices available
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