Summary 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.
Application 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.
Standard A. GB3804-90<3~65KV AC H. V Load switch> B. GB16926-1997(eqv. IEC62271-2002) C. GB1995-89 Normal Serviec Condition 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. Environment degree: Grade II. If requirements are not mentioed above, users can fix them with the manufacturer.
Moving contact position
Between Phases distance (before mechanism store energy)