FN18-12D/630-20 Indoor 12kV 3-Phase Air Load Break Switch with Fuse and Earthing Switch

FN18 12kV 3-Phase Gang Operated Air Load Break Switch

Product Overview

The FN18 series represents a pinnacle in high-voltage engineering, offering high-performance load switches that combine two advanced arc-extinguishing technologies: compressed-air and gas-produced arc extinguishing. This dual-action system ensures maximum reliability and safety for medium-voltage power distribution networks.

The integration of the load switch with a fuse unit offers a comprehensive protection solution. This combination allows for:

• Flexible Load Switching: Safely switch any load current up to the rated breaking current.

• Superior Overcurrent Protection: Capability to interrupt overcurrents up to the rated short-circuit breaking current through the synchronized operation of the fuse and its impinger.

• Integrated Safety: Comes equipped with a dedicated Earthing Device to ensure operator safety during maintenance.

Usage Environment & Service Conditions

To ensure optimal performance and longevity, the FN18 load break switch should be operated under the following environmental conditions:

1. Ambient Temperature

• Maximum Temperature: +40°C.

• Maximum 24-hour Average: +35°C.

• Minimum Temperature: -15°C (compliant with “minus 5 indoor class” standards).

2. Humidity & Atmospheric Conditions

• Daily Average Relative Humidity: ≤ 95%.

• Monthly Average Relative Humidity: ≤ 90%.

• Saturated Vapor Pressure: Daily mean values ≤ $2.2 \times 10^{-3}$ MPa; monthly average ≤ $1.8 \times 10^{-3}$ MPa.

3. Altitude

• Maximum Site Altitude: ≤ 1000 meters above sea level.

Why Choose the FN18 Series?

As a specialized supplier of power fittings and high-voltage equipment, we ensure that our FN18 switches meet rigorous industrial standards. Whether you are upgrading an existing switchgear or building a new distribution substation, our FN18 series provides the durability and precision required for critical electrical infrastructure.