FN18 High Voltage Load Break Switch Nalf Air Insulation Switch Breakers

• Specification
• Technical parameters

• FN18 Load Break Switch Nalf Switch Product Overview

  FN18-口is a general purpose, three-pole, load break switch that offers switchgear owners and assemblers the advantages of an advanced interrupting technology and proven, dependable performance in a compact design. The switch is available to switchgear assemblers as a building block for metal-enclosed and pad-mounted switchgear applications in ratings from 12-40.5 kV.
  The standard FN18 switch includes a heavy-duty steel frame with stand-off insulators, a unique puffer-type arc extinguishing system, an operating mechanism and current-carrying components, including blade-type interrupters with cast hinges and jaw connectors.
  Optional accessories and features include a variety of operating handles, a motor operator, auxiliary switches, a shunt trip device, fuse bases, mechanical fuse tripping, grounding switches, mechanical door interlocking and key interlocking.

  FN18 series indoor high-voltage load switch has the advantages of easy design, operation, compact structure, small volume, full function, light weight, fast breaking and closing speed and high reliability. It is suitable for AC 50Hz, rated voltage 12kV, 24kV, rated current 630A and three-phase distribution system, especially for city network construction and renovation projects, high-rise buildings, ring network power supply of public facilities, and is an ideal product for box-type substation and transformer protection.

• FN18 Nalf Air Insulation Switch Breakers Fuse 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