Medium Voltage Indoor Load Break Switch (Switch-fuse Combination), FKN12A-12/FKRN12A-12

This medium voltage indoor load break switch is used in three phase power distribution systems with voltage up to 12KV, aiming at controlling and protecting transformers, cables, overhead lines and other power equipment. It is suitable for substations of rural and urban power networks, and can protect electrical power in open ring or radial distribution systems.

FKN12A- 12D series load break switch is capable of breaking and closing of load current and overload current.
FKRN12A- 12D series load break switch (switch-fuse combination) is capable of breaking and closing load current, overload current and short-circuit current.

Environmental Conditions Ambient temperature: up to 40°C, greater than -25°C; Altitude: lower than 1000 m; Relative humidity: daily average ≤ 95%, monthly average ≤ 90%; Earthquake intensity: ≤ magnitude 8; Areas without risks of fire, explosion, chemical corrosion and severe vibration; Pollution level: III; Features Integrating load switch, earthing switch, fuse and mechanism in one frame, featuring flexible combination, compact structure, small size and easy installation; High dynamic and thermal stability; Static contact insulating cover can prevent arc short-circuit in switch cabinet, no need of insulated partitioning panels; Reliable mechanical locking system between load switch, earthing switch and fuse; Manual operation and AC/DC electrical operation are available, helping to achieve remote controlling, remote measuring and remote signaling in power system; Technical Parameters

Item		Unit	FKN12A-12D	FKRN12A-12D
Rated voltage		KV	12	12
Rated frequency		Hz	50	50
Rated current		A	630	125
Power frequency withstand voltage(1min)		KV	42	42
Lightning impulsewithstand voltage(peak)			75	75
Rated short-time withstand current	Load switch	KA	20	-
	Earthing switch		20
Rated short-circuit duration	Load switch	S	4	-
	Earthing switch		2
Rated short-circuit making current(peak)		KA	50	-
Rated closed-loop breaking current		A	630	-
Rated short-circuit breaking current		KA	-	31.5
Mechanical endurance		Times	2000	2000

FKN12A-12D FKN12A-12D FKRN12A-12D FKRN12A-12D