FN11-12RD series high-voltage load switchDetailed product description：

FN11-12/630-20 indoor AC high voltage load switch (hereinafter referred to as FN11-12D load switch) is a three-phase high voltage starting device with a rated voltage of 12kV and a rated frequency of 50Hz. It is used for switching load current, closed-loop current, no-load transformer and cable charging current, and switching short-circuit current. Load switches equipped with grounding switches can withstand short-circuit currents.  
FN11-12RD/125-31.5 AC high voltage load starting fuse combination (hereinafter referred to as FN11-12 (R) D combination) is an indoor high voltage switchgear that combines FN1112RD load switch with S-port LAJ (XRNT port-10) high voltage current limiting fuse. It can disconnect any current up to the short-circuit current; The load switch disconnects the working current, the fuse disconnects the short-circuit current, and jointly disconnects any current between the working current and the full short-circuit current. At the same time, the fuse causes the load switch to open through its impact.  

Scope of application of FN11-12RD series high-voltage load switch
The FN11-12D/load switch FN11-12RD combination electrical device is mainly used for load control and short-circuit protection in urban distribution stations and industrial electrical equipment powered by three-phase ring networks or terminals. Due to the more reliable protective effect of composite appliances on electrical equipment such as transformers than using circuit breakers, they are particularly suitable for ring networks, radiation replacement units, and box type substations.  

Normal working environment
Using ambient air temperature: upper limit+40 ℃, lower limit -25 ℃;  
Altitude not exceeding 1000M
Relative humidity, with a daily average not exceeding 95% and a monthly average not exceeding 90%;  
The surrounding air should not be significantly polluted by corrosive or flammable gases and water vapor;  
No frequent vigorous exercise;  
Pollution resistance level: Level II;  
If the usage conditions exceed the above regulations, it shall be determined through consultation between the user and the manufacturer.   

Technical parameters and performance of FN11-12RD series high-voltage load switch

serial number	project	unit	FN11-12D/630	FN11-12RD/125
one	rated voltage	kV	twelve
two	rated frequency	Hz	fifty
three	rated current	A	six hundred and thirty	one hundred and twenty-five
four	Lightning impulse withstand voltage	kV	Ground and phase to phase 75, isolation and disconnection 85
five	1-minute power frequency voltage	kV	Ground and phase 42, isolation and disconnection 48
six	Rated thermal stability current	kA	20(4S)
seven	Rated dynamic stable current	kA	fifty
eight	Rated closing current (peak value)	kA	fifty	fifty
nine	Rated short-circuit breaking current (expected value)	kA		thirty-one point five
ten	Maximum 1 ㎡· t when temporarily disconnecting current	A²S		According to the characteristic curve of the fuse
eleven	Minimum breaking current	kA		According to the characteristic curve of the fuse
twelve	Rated transfer current	kA		one point five
thirteen	Maximum breaking current (reference value)	kA	one point eight
fourteen	Disconnect the capacity of the no-load transformer	kva	one thousand two hundred and fifty
fifteen	Rated cable charging current	A	ten
sixteen	Rated active load current breaking times	time	>100
seventeen	Rated active load current switch opening time	S		>0.06
eighteen	Grounding switch thermal stability current	kA	20(2S)	20(2S)
nineteen	Stable current (peak value) of grounding switch	kA	fifty	fifty
twenty	Electric motor operating power supply voltage	V	AC/DC 100, 220

FN11-12RD series high-voltage load switch mechanical characteristic parameters

serial number	project	unit	FN11-12D/630	FN11-12RD/125
one	Total travel of moving contact	mm	200 +8 -2
two	Intermediate distance between phases (before energy storage of the mechanism)	mm	210±3
three	Moving contact overtravel	mm	40±2
four	Auxiliary hoe opening distance	mm	one hundred and fifty
five	Synchronization of three-phase opening and closing	ms	<3
six	Just divided speed	ms	>2.8	>2.8
seven	Just closed speed	ms	>3.8
eight	Distance between metal valve and conductive tube	mm	>125
nine	Grounding switch fracture distance	mm	>150
ten	main circuit resistance	μΩ	<120	<300
eleven	Maximum operating force distance	Nm	<160