FN18 12kV 3 Phase Gang Operated Air Load Break Switch With Earthing Device And Fuse Switch Nalf

• Specification
• Technical parameters

• FN18 12kV 3 Phase Gang Operated Air Load Break Switch Product Overview

  FN18 load switches and load switch-fuse combinations are high-voltage, high-performance load switches combining compressed-air arc extinguishing and gas-produced arc extinguishing.
  The combination of load switch and fuse combines the advantages of the load switch with those of the fuse to switch any load current up to the rated breaking current of the load switch, and to switch any overcurrent up to the rated short-circuit breaking current of the combination by means of the operation of the fuse and its impinger.

  1.Ambient temperature:
  Maximum +40°C Maximum 24 hour average +35°C
  Minimum (according to “minus 5 indoorclass” )-15°C.
  2.Humidity:
  Daily average ambient air relative humidity≤95%, on average≤90%;
  Saturated vapor pressure of daily mean values s 2.2 X 10-3Mpa, on averages 1.8 x10- 3Mpa;
  Maximum site altitude:s 1000 M above sea level

• FN18 12kV Air Load Break Switch Technical parameters

  Rated voltage		Unit	12kV			17.5kV			24kV			36kV			40.5kV
  Rated current		A	400	630	1250	400	630	1250	400	630	1250	630	800	1000	630	800	1000
  Max.rated current		A	400	630	1250	400	630	1250	400	630	1250	630	800	800	630	800	800
  Short circuit making capacity		KA peak	67			50			50			50			50
  Peak withstand current*		KA peak	82			82			82			66			66
  Short time current	1 sec.	KA eff	31.5 25 20	31.5 25 20	31.5 25 20	31.5 25	31.5 25	31.5 25	25 25 16	25 25 16	31.5 25  16	25	25	25	25	25	25
  	2 sec.
  	3 sec.
  Mainly active load breaking capacity (test duty 1 and, IEC 60265-1( 265))		A	400	630	1250	400	630	1250	400	630	1250	630	800	630	800	630	800
  Mainly capacitive breaking capacity (test duty 4, IEC 60265-1 (IEC 265))		A	150			45			80			50			50
  Mainly inductive breakingcapacity cosφ=0.15		A	16			16			16			16			16
  Max. breaking capacity in co-operation with fuses IEC 62271-105(IEC 420 1990-11)		A	1600	1600		1600	1600		900	900		300*	300	300	300	300	300
  Power frequency withstand voltage 50 Hz 1 min.   -to earth and between poles                                  -across isolating distance		kV	42 45			45 60			55  70			80 88			95 120
  Impulse withstand voltage 1.2/50 μs  – to earth and between poles    – across isolating distance		kV	75 85			95 110			125 145			170 195			190 220
  Pole distance		mm	150, 170, 210			170,210			170,235,275			360			360
  Max. operating torque at: -closing K/A mech.                                            -opening K/A mech.		Nm	115-120 Nm K-mech.120 Nm/A-mech. 3Nm									80-100 Nm K-mech.80-100 Nm
  Operating angle on the shaft		degree	130									120
  Opening time		ms	40-60									60

  FN18 Outline Dimension Drawing

  

  

  FN18 load break switch structure