Load Break Switch Indoor/LBS/24kV/630A/FN12-12/IEC60265
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FN12 is a three-phase H. V switch equipment, which is used for 12KV 50Hz for breaking and switching load current, no-load transformer cable charging current and closing short-circuit current. The load switch with earth switch can switch short-circuit current.
FN12-12DR Load Break Switch-Fuse Combination is made up of FN12-12D load switch and S LAJ-12(XRNT -10) H. V current limiting Fuse. This switch can break any current till short-circuit current. Because of the striker of the fuse, the switch can switch off automatically.
It is used for the ring main units and industrial equipment of 12KV and three-phase AC 50Hz to control load and short-circuit current. Because the switch-fuse combination protects transformer equipment more reliably than circuit breaker. It is especially suitable for ring main units, radial distribution and combined transformers.
A. GB3804-90<3~65KV AC H. V Load switch>
A. The ambient air temperatrue: Max: +40oC. Min: -25oC.
B. The altitude ≤ 1000m.
C. The relatire humidity of air Daily average ≤ 95%. Monthly average ≤ 90%
D. The ambient air should not be obviously polluted by corrosivity or the flammability gas and geam. etc.
E. Without frequent shake.
F. Enviroment degree: Grade II.
If requirements are not mentioed above, users can fix them with the manufacturer.
|1||Moving contact position||mm||200±8-2|
|2||Between Phases distance (before mechanism store energy)||mm||210±3|
|3||Moving contact ultra travel||mm||40±2|
|4||Auxiliary contact distance||mm||40±2|
|5||Three-phase switch on-and-off synchronicity||m/s||<3|
|8||Distance between metal value and conducting pipe||mm||>125|
|9||Across isolating distance of earth switch||mm||>150|
|10||Main. loop resistance||μΩ||<120||<300|
|11||Max. Operating moment||Nm||<160|