This vacuum load switch is used in pole top sitution with the operation function of manual and electric.It adopts vacuum for arcextion,N2gas for external insulation,internal series isllating knife and interrupter.Its has high insulation,the internal built-in zero sequence and short to protece current transformer,and the inner (or outer)voltage transformer can supply the operational power.The whole structure is free maintenance equipment. This switch consists of two parts:FZW28-12 vacuum load switch and detection part.The switch has fatal detection function,protect control function and communication function.The switch is installed in the 10kVoverhead line,and it can cut off single-phase earth fault and insulate phase fault automatically.It also can be used in the demarcation point in 10 kVdistribution line,and satisfactory Tjunction in branch line.

Overall dimensions

Technical parameters

No. Item Unit Value
1 Rated voltage kV 12
2 Rated frequency Hz 50
3 Rated current A 630
4 1min power frequency withstand voltage(wet)(dry)phase to phase,  phase to earth/fracture kV 34/42/48
5 Lightning impulse withstand voltage(peak) phase to phase, phase to earth/fracture kV 75/85
6 Rated active load breaking current A 630
7 Rated close-loop breaking current A 630
8 Rated cable-charging breaking current A 10
9 5% active load breaking curren  A 31.5
10 Rated short time withstand current/duration kA/s 20/4
11 Rated peak withstand current kA 50
12 Rated short-circuit making current kA 50
13 Resistance of main circuit μΩ ≤550
14 Rated N2gas pressure (gage pressure) MPa 0.01
15 Mechanical life Times 10000

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