indoor vacuum switch-fuse combinations(FZN21-12D/T

Summary: FZN21-12D/T630-20,FZN21-120R/T125-31.5 series high-voltage vacuum load switch and combined electrical apparatus is used in three-phase ac 12kV, 50Hz power distribution system, with compact structure, small volume, light weight, long life and good opening-closing open circuit ability, it’s safe and reliable. It cooperate to use with fuse (for short is combined electrical apparatus).It can replace the higher cost circuit breaker, it’s easy operation and simple maintenance. Ambient condition: Altitude: less or equal to 1000meters Ambient air temperature: minus 25 centigrade degree to 40 centigrade degree Air relative humidity on day average is not more than 95 percent, on month average is not more than 90 percent No electrical conductivity dust, corrosive gas and steam places. No fire and explosion danger of places. No violent vibration, gradient is less than 3 degrees of places. Technical parameters of load switch: Rated voltageRated currentRated short-circuit closing currentRated short-circuit breaking current(combined electrical apparatus)Rated active load breaking current4S thermal stability currentDynamic stability currentOne minute of power frequency withstand voltageDraught of thunder withstand voltage10. Mechanical life 11. Rated transfer current(combined electrical apparatus) 12. Electromotor operation supply voltage Structural features,function(and outline installing dimension): FZN21-12 series load switch and combined electrical apparatus is mainly composed with framework, disconnecting switch(or fuse substitute for load switch),vacuum arcing chamber, earthed switch, controlling mechanism, etc. This product has compact structure, small volume, long life, strong closing-opening breaking ability, easy operation and convenient maintenance. Vacuum switch is equipped with electric operation mechanism and spring storage, which can realize rapid fits the closing-opening operation. Disconnecting switch, vacuum switch, earthed switch interlocking between each other, in case incorrect operation. Load switch without fuse and tripping mechanism: frameworkisolation knifefuseinsulating tension poleupper bracketarc extinguish chamberearth switch static contactinsulatorearth switch10. ground connecting spring 11. separating brake spring 12. insulating tension pole 13. principal axis 14. tripping mechanism 15. countershaft 16. linkage bars 17. controlling mechanism Ordering instruction: When placing order, please state product type, name, specification, quantity, operation structure voltage. FZN21-12D/T630-20,FZN21-12DR/T125-31.5 indoor vacuum load switch-fuse combinations outline dimensional drawing: A- isolation knife, knife handle hole A1-isolation knife, knife deciliter location pin A2-isolation knife, knife deciliter display hole B-vacuum arcing chamber(operator)manual closing operation hole (note: only clockwise) B1-vacuum arcing chamber(operator)manual trip bush button B2-vacuum arcing chamber(operator) deciliter display hole