FN18-12 FN18-24 Indoor High Voltage Load Break Switch and Fuse Combination

FN18-D 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 load break switch FN18
Rated voltage	Un	kV	12kV			24kV
Rated current	In	A	400	630	1250	400	630	1250
Max.rated rated current	I	A	400	630	1250	400	630	1150
Short circuit making capacity	Ima	kA peak	67	67	67	50	50	50
Peak withstand current	Idyn	kA peak	82	82	82	82	82	82
Short time current      1sec.                                  2sec. 3sec.	Ith“ “	kA eff“ “	31.525 20	31.525 20	31.525 20	2525 16	2525 16	31.525 16
Mainly active load breaking capacity(test duty 4, IEC 60265-1 (IEC265))	I	A	400	630	1250	400	630	1250
Mainly capacitive breaking capacity(test duty 4, IEC60265-1 (IEC 265))	I	A	150	150	150	80	80	80
Mainly inductive breaking capacity cosφ=0.15		A	16	16	16	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	75 31.5	75 31.5	75 31.5
Max. Breaking capacity in co-operation with fuses IEC 62271-105 (IEC 420 1990-11)		A	1600	1600		900	900
Max. Fuse size	In	A	125	125		80	80
Power frequency withstand voltage 50Hz1 min.-to earth and between poles-across isolating distance		kV kV	42 45			55 70
Impulse withstand voltage 1.2/50μs-to earth and between poles -across isolating distance		kV kV	75 85			125 145
Pole distance	P	mm	150 and 170			235, 250 and 275
Max.operating torque at:-closing K/A mech. -opening K/A mech.		Nm Nm	115-120 Nm K-mech. 120 Nm/A-mech. 3Nm
Operating angle on the shaft		degree	130
Opening time		ms	40-60