FKN12-12D Load Break Switch FKRN12-12D Load break Switch and Fuse Combination Apparatus

Ambient condition

1. Altitude: ≤1000m;
2. Ambient temperature: -25℃ ~+40℃ ;
3. Relative humidity: daily average ≤95% , monthly average ≤90% ;
4. Earthquake intensity: ≤8 degree;
5. Pollution degree:‖ ;
6. Applicable occasions should free from inflammables, explosives, corrosives and severe vibration.

Model

Product feature

These series products feature with compact dimension, well design, reliable interlock and high insulating level. In the spring
storage operation mechanism, C/O speed is out of manpower influence. For the arc-extinguishing, electric arc extinguish
inside the insulating cover, the free gas occurs do not cause decrease of insulation level between phases and phase to ground.
The clapboard of insulation cover separates electrified part thus advances protection grade of ring main unit. The copper-tu ngsten
contact and main contact bring along reliable conductivity and long life. This product achieves sound fame due to the e asy
maintenance and operation as well as reliable performance.

Technical specification

No.	Item	Unit	FKN12-12D	FKRN12-12D(HRC fuse)
1	Rated voltage	kV	12	12
2	Rated power frequency	Hz	50/60	50/60
3	Rated current	A	630	1250
4	1min. PF withstand voltage(phase to earth, phase to phase)	kV	42	42
5	1min. PF withstand voltage(across open contacts)	kV	48	48
6	Lightning impulse withstand voltage(phase to earth, phase to phase)	kV	75	75
7	Lightning impulse withstand voltage(across open contacts)	kV	85	85
8	Rated short-time withstand current (thermal steadily)-LBS	kA	20
9	Rated short-time withstand current(thermal steadily)-earthing switch	kA	20
10	Rated short-circuit duration(thermal steadily time)-LBS	s	4
11	Rated short-circuit duration(thermal steadily time)-earthing switch	s	2
12	Rated short-circuit making current(peak)	kA	50
13	Rated breaking current active load breaking current	A	630
14	Rated breaking current loop breaking current	A	630
15	5% of rated active load breaking current	A	31.5
16	Rated breaking current cable charging current	A	10
17	Rated breaking current no-load transformer capacity	kVA	1250
18	Rated short-circuit breaking current(fuse)	kA		31.5
19	Rated transfer current	A		1200
20	Mechanical life	Times	2000	2000

Mechanical performance

No.	Item	Unit	Data
1	Distance of open contacts	mm	175
2	Middle distance of poles	mm	210  2
3	air clearance of poles	mm	125
4	Travel	mm	210  4
5	Over-travel	mm	40
6	Three pole making asynchronous	ms	10
7	Three pole breaking asynchronous	ms	5
8	Release tripper breaking time	ms	40~65
9	Main circuit resistance		130

Outline Dimension