JN15-24 Indoor earthing switch is applicable for three-phase AC power system of rated voltage up to 7.2KV~40.5KV and frequency 50/60 Hz, it widely used in many fields such as power plant, transformer substation, petrol chemical industry, metallurgy, manufacturing industry, airport, residential area, etc, for mounted at in frequency operation service indoor air insulating switchgear like tyoe KYN28 or KYN96, ABB type ZS series,etc. The application of it and its expending products can fully meet the requirement of GB, DL, IEC, DIN, VDE ad well as standards of other advanced industrial countries.

++++Swrvice environment:

a)Air temperatue: Maximum temperature:+40℃; Minimum temperature :-35℃

b)Humidity:Monthly average humidity 95%; Daily average humindity 90%.

c)Altitude above sea level: Maximum installation altitude:2500m

d)Ambient air not apparently polluted by corrosive and flammable gas, vapor, etc.

e)No frequent violent shake

++++Main technical specifications:

No.	Item	Unit	Parameter
1	Rated voltage	KV	24
2	Rated frequency	Hz	50/60
3	1min power frequency withstand voltage	KV	65
4	Lightming impulse withstand voltage	KV	120/150
5	Short time withstand current(4s)	KA	31.5
6	Mechanism life	times	2000