Home » Switching Devices »Load Break Switch » FN18 series Indoor High Voltage Load Break Switch Nalf Air Insulation Switch Breakers Fuses
  • FN18-load break switch
  • FN18-load break switch
FN18-load break switch
FN18-load break switch

FN18 series Indoor High Voltage Load Break Switch Nalf Air Insulation Switch Breakers Fuses

Model: FN18-12

Description

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.
  • General
  • Structure
  • Technical parameter
  • Model & Drawing

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 lbs structure

 

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 21 (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 breaking capacity 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 LBS drawing

FN18 LBS drawing

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