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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.

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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