FKN12‑12A Indoor High‑Voltage Load Switch‑Fuse Combination Unit

Overview

FKN12A‑12D gas‑pressure type load switch and FKRN12A‑12D series gas‑pressure type load switch‑fuse combination unit are applicable to 3‑phase power distribution systems of 12 kV and below, for control and protection of power equipment such as transformers, cables and overhead lines. They are especially suitable for terminal substations and box‑type substations in urban and rural power networks, as well as for control and protection of ring‑network and double‑radial power supply units.

FKN12A‑12D series gas‑pressure type load switch is capable of making and breaking load current and overload current.

FKRN12A‑12D series gas‑pressure type load switch‑fuse combination unit can make and break load current, overload current and break line short‑circuit current.

Operating Conditions

• Ambient air temperature: -25 ℃ ~ +40 ℃;
• Altitude: ≤ 1000 m;
• Relative humidity: daily average ≤ 95 %, monthly average ≤ 90 %;
• Seismic intensity: not exceeding Grade 8;
• Sites without fire hazard, explosion risk, chemical corrosion and severe vibration;
• Pollution degree: II.

Structural Features

‑ The load switch, earthing switch, fuses and operating mechanism are assembled on one single frame for flexible combination. It features compact structure, small dimension and easy installation.

‑ The break adopts direct‑acting layout with high dynamic and thermal withstand current ratings, and operation can be completed in one single stroke.

‑ Equipped with static‑contact insulating shield, which realizes structural isolation for ring‑main units. Inter‑phase insulating partitions and break‑point insulating shutters are eliminated, preventing internal arc short‑circuit faults inside cabinet.

‑ Unique shutter‑door structure: the shutter automatically isolates the break after load‑switch opening, providing excellent protection performance.

‑ Reliable mechanical interlocks are fitted between load switch, earthing switch and fuses, complying with "five‑prevention" requirements.

‑ Two operation modes are available: manual operation, and motor‑driven operation with AC/DC dual‑purpose power supply, convenient to satisfy the "three‑remote‑control" requirements of power system.