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