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Home/Load Break Switch/12kV Indoor Load Break Switch/FZRN21-12D Vacuum Load Break Switch And Fuse Combination Apparatus 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.
Features of FZRN21-12D Vacuum Load Break Switch And Fuse Combination Apparatus
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.
Parameters of FZRN21-12D Vacuum Load Break Switch And Fuse Combination Apparatus
| 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 |
Dimensions of 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
Use Conditions of FZRN21-12D Vacuum Load Break Switch And Fuse Combination Apparatus
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.
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