Complaint
FN18 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.
Technical parameter
| 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 | ||||||||||||||
Structure
