Load Break Switch Indoor High voltage disconnector

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<High-voltage alternating current switch-fuse combinations>(eqv. IEC62271-2002) c,GB1995-89<AC H.V isolate switch and earth switch> Techniacl parameter and performances(please see the table) No.DescriptionUnitFN12-12D/630FN12-12D(R)D/1001Rated voltageKV122Rated frequencyHz503Rated currentA6301004Lighting impulse resisting voltageKVTo earth and between poles 75/ across isolating distance 8551min power frequency withstand voltageKVTo earth and between poles 42/ across isolating distance 486Rated short time withstand currentKA20(4S)7Rated Peak Withstand CurrentKA508Rated closing current(peak)KA50509Rated short-circuit breaking current (prospective value)KA31.510Max. critical breaking current I2·tA2Sfuse characteristic curve11Min. Breaking currentKAfuse characteristic curve12Rated transfer currentKA1.513Max. breaking current(reference value)KA1.814Braking no-load transformer capacitykva125015Rated cable charging currentA1016Rated power load current breaking timestime≥10017Switch-off time of rated power load current switch on-and-offS>0.0618Rated transfer currentKA20(2S)20(2S)19Rated transfer currentKA505020Motor operating power voltageV110,220 DC/AC Operation handle