FZRN21-12D Vacuum Load Break Switch and Fuse Combination Apparatus

FZRN21-12D Vacuum Load Break Switch and Fuse Combination Apparatus

• Specification
• Parameters

• FZRN21-12D Load Break Switch and Fuse Combination Apparatus Summary

  FZRN21-12D indoor vacuum load break switch and fuse combination apparatus applies to power system of rated voltage 12kV,  AC 50/60Hz.  It distributes power, control and protect electric apparatus. The apparatus replace expensive VCB to service in electricity network.  It can also be used in rural and urban power supply systems to break and make under rated current and short-circuit current when the circuit breaks down.  It is also applicable to control and protect transformers.

  Product feature

  The load-breaking switch is an interlock device of three-phase.  The VCB is operated by electric spring or dependent manual. The opening operation is of both dependent manual and dependent power.

  There is reliable interlock between vacuum arc-extinguish chamber, disconnect blade and grounding blade.  When the fuse breaks down, the load-breaking switch opens by the interlock mechanism.  The load break switch can be mounted in switchgear and hang-on the wall to protect transformers.

  Ambient Condition

  1. Altitude: ≤1000m; 

  2. Ambient temperature: -25℃~+40℃;

  3. Relative humidity: daily average ≤95％, monthly average ≤90％;

  4. Earthquake intensity: ≤8 degree;

  5. Applicable occasions should free from inflammables, explosives, corrosives and severe vibration.

• FZRN21-12D Load Break Switch Technical parameters

  No.	HRC fuse	Unit	Data
  1	Rated voltage	kV	12
  2	Rated frequency	Hz	50/60
  3	Rated maxim current of fuse	A	125
  4	Transfer current	A	1550
  5	Opening duration of switch activated by fuse	ms	40±5
  6	Rated short-circuit breaking current	kA	31.5
  7	Rated short-circuit making current (peak)	kA	80
  8	1min. PF withstand voltage (phase to phase/to earth, across open contacts)	kV	42/49
  9	Lightning impulse withstand voltage (phase to phase/to earth, across open contacts)	kV	75/85
  10	Fuse impinger model		Middle

   

  No.	LBS	Unit	Data
  1	Rated voltage	kV	12
  2	Rated frequency	Hz	50/60
  3	Rated current	A	630
  4	Rated active load breaking current	A	630
  5	Rated closed-loop breaking current	A	630
  6	5% of active load breaking current	A	31.5
  7	Rated breaking current of charging cable	A	10
  8	Rated breaking current of no-load transformer	A	No-load current of 1250kVA transformer
  9	1min. PF withstand voltage (phase to phase/to earth, across open contacts)	kV	42/49
  10	Lightning impulse withstand voltage  (phase to phase/to earth, across open contacts)	kV	75/85
  11	4s rated short-time withstand current	kA	31.5
  12	Rated peak withstand current	kA	80
  13	Rated short-circuit making current	kA	80
  14	Mechanical life	times	10000
  15	Permissible corrosion thickness of contact	mm	2
  16	C/O operating moment	N·m	≯200

  FZRN21-12D Dimensions for reference

   

  

  FZRN21-12D Vacuum Load Break Switch and Fuse Combination Apparatus

  1.Framework     2.Disconnect blade     3.Fuse     4.Insulating bar     5.Upper bracket     6.Vacuum interrupter 7.Fixed contact     8.Insulator     9.Earthing blade     10.Earthing spring     11.Opening spring 12.Trip driving device     13.Insulating bar     14.Main shaft     15.Auxiliary axis     16.Adjusting bar 17.Spring operating mechanism