FN18 Indoor Load Break Switch
- Material: Copper with Silver Glavizanition
- Rated Voltage: 12kV, 15kV, 24kV, 27kV
- Rated Current: 630A, 1250A
- Standards: IEC 62271-102
- Use for Air Switchgear, Ring Main Units
General
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.
| Technical specification Switch Disconnector Type FN18-12 | |||||
| Rated Voltage | Un | kV | 12 | ||
| Rated Current | In | A | 400 | 630 | 1250 |
| Max. Rated Current | I | A | 400 | 630 | 1250 |
| Short Circuit Making Capacity | Ima | kA peak | 67 | 67 | 67 |
| Peak Withstand Current | Idyn | kA peak | 82 | 82 | 82 |
| Short Time Current 1sec. 2sec. 3sec. | Ith | kA eff | 31.5 25 20 | 31.5 25 20 | 31.5 25 20 |
| Mainly Active Load Breaking Capacity (test duty 4, IEC 60265-1) | I | A | 400 | 630 | 1250 |
| Mainly Capacitive Breaking Capacity (test duty 4, IEC 60265-1) | I | A | 150 | 150 | 150 |
| Mainly Inductive Breaking Capacity cosφ=0.15 | I | A | 16 | 16 | 16 |
| Rated earth fault breaking capacity, IEC 60265-1 (IEC 265) Earth fault breaking capacity Capacitive breaking capacity | I I | A A | 150 90 | 150 90 | 150 90 |
| Max. Breaking capacity in co-operation with fuses IEC 62271-105 (IEC 420 1990-11) | I | A | 1600 | 1600 | |
| Max. Fuse Size | In | A | 125 | 125 | |
| Power frequency withstand voltage 50Hz 1 min. -to earth and between poles -across isolating distance |
kV kV |
42 48 |
|||
| Impulse withstand voltage 1.2/50μs -to earth and between poles -across isolating distance |
kV kV |
75 85 |
|||
| Pole Distance | P | mm | 150, 170, 210 | ||
| Max.operating torque at: -closing K/A mech. -opening K/A mech. |
Nm Nm |
115-120Nm K-Mech. 120Nm/A-Mech. 3Nm |
|||
| Operating angle on the shaft | degree | 130 | |||
| Opening Time | ms | 40-60 | |||
| Technical specification Switch Disconnector Type FN18-24 | |||||
| Rated Voltage | Un | kV | 24 | ||
| Rated Current | In | A | 400 | 630 | 1250 |
| Max. Rated Current | I | A | 400 | 630 | 1250 |
| Short Circuit Making Capacity | Ima | kA peak | 50 | 50 | 50 |
| Peak Withstand Current | Idyn | kA peak | 82 | 82 | 82 |
| Short Time Current 1sec. 2sec. 3sec. |
Ith | kA eff | 25 25 16 |
25 25 16 |
31.5 25 16 |
| Mainly Active Load Breaking Capacity (test duty 4, IEC 60265-1) | I | A | 400 | 630 | 1250 |
| Mainly Capacitive Breaking Capacity (test duty 4, IEC 60265-1) | I | A | 80 | 80 | 80 |
| Mainly Inductive Breaking Capacity cosφ=0.15 | I | A | 16 | 16 | 16 |
| Rated earth fault breaking capacity, IEC 60265-1 (IEC 265) Earth fault breaking capacity Capacitive breaking capacity |
I I |
A A |
75 31.5 |
75 31.5 |
75 31.5 |
| Max. Breaking capacity in co-operation with fuses IEC 62271-105 (IEC 420 1990-11) | I | A | 900 | 900 | |
| Max. Fuse Size | In | A | 80 | 80 | |
| Power frequency withstand voltage 50Hz 1 min. -to earth and between poles -across isolating distance |
kV kV |
55 70 |
|||
| Impulse withstand voltage 1.2/50μs -to earth and between poles -across isolating distance |
kV kV |
125 145 |
|||
| Pole Distance | P | mm | 235, 250, 275 | ||
| Max.operating torque at: -closing K/A mech. -opening K/A mech. |
Nm Nm |
115-120Nm K-Mech. 120Nm/A-Mech. 3Nm |
|||
| Operating angle on the shaft | degree | 130 | |||
| Opening Time | ms | 40-60 | |||
Drawings
Packing Details
| Model | Description | Gross Weight/kgs | Net Weight/kgs | Volumn/m3 | Packing Size/m |
| FN18-12 | 12kV 630A LBS, P=170mm | 55 | 48 | 0.4 | 0.5*0.5*0.6 |
| FN18-12D | 12kV 630A LBS with Earth Switch, P=170mm | 60 | 52 | 0.4 | 0.5*0.5*0.6 |
| FN18-12R | 12kV 630A LBS-Fuse Combination, P=170mm | 55 | 48 | 0.4 | 0.5*0.5*0.6 |
| FN18-12DR | 12kV 630A LBS-Fuse Combination with Earth Switch, P=170mm | 60 | 52 | 0.4 | 0.5*0.5*0.6 |
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