FKN12A-12D indoor high-voltage alternating-current vacuum load switch-fuse combination (“combination” for short) is used in power systems with an AC frequency of 50 Hz and a rated voltage of 10 kV to break load currents, overload currents and short-circuit currents. It particularly applies to the places needing control, protection for oil-free, maintenance-free and frequently-operated ring network power supply units and terminal power supply transformers.
The combination is characterized by large breaking capacity, high safety and stability, long electrical life, support for frequent operation, less maintenance, etc. It has an apparent isolating gap, an earthing switch with making capability, an electric spring actuator and remote control capability.
FKN21 indoor compressed-air load switch is produced in line with the following standards and codes.
● GB 16926-1997 High-voltage alternating-current load switch-fuse combinations
● IEC 60420 High-voltage alternating-current load switch-fuse combinations
Normal operating conditions
● Ambient temperature: - 40°C ~+40°C (below 35°C within 24 hours)
● Relative humidity: ≤95% (daily average) or ≤90% (monthly average)
● Altitude: ≤ 1000m
