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FN18 High Voltage Indoor Load Break Switch

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 upto 24kV. 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.

parameters

Technical Information

Technical Specification
Rated voltage	kV	12	24
Rated current	A	630	630
Rated power frequency	Hz	50/60	50/60
Short circuit making capacity	kA Peak.	50	50
Peak withstand current	kA Peak.	50	50
Short time current	kA eff.
1Sec.		31.5	25
2Sec.		25	25
3Sec.		20	16
Max. breaking capacity in co-operation with fuses IEC 62271-105 (IEC 420 1990-11)	A	1600	900
Max. fuse current(XRNT Fuse)	A	200	200
Power frequency withstand voltage 50Hz 1 min,:
- To earth and between poles	kV	42	65
- Across isolating distance	kV	48	79
Impulse withstand voltage 1.2/50μ s:
- To earth and between poles	kV	75	125
- Across isolating distance	kV	85	145
Mechanism Endurance	cycles	2000	2000

Overall and installation dimensions

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FN18 High Voltage Indoor Load Break Switch