FN7‑12 Indoor High‑Voltage Combined Apparatus of Load Switch and Fuse

General Description

FN7‑12DR indoor AC high‑voltage load switch is applied in 3‑phase AC power systems with 50 Hz rated frequency and 12 kV rated voltage. It is used for breaking load current and making‑on short‑circuit current. The combined apparatus can break any current up to short‑circuit current and serves for protection purpose.

Operating Conditions

• Normal service conditions: Ambient air temperature: upper limit +40 °C, lower limit ‑25 °C;
• Altitude: 1000 m and below above sea level;
• Relative humidity: daily average ≤95%, monthly average ≤90%;
• The surrounding air shall not be obviously polluted by corrosive or flammable gases, water vapour, etc.;
• No frequent severe vibration.