Product name:
FZRN21-12D Indoor AC High Voltage Vacuum 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 sys tems 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 fre e from inflammables, explosives, corrosives
and severe vibration.
Product feature
The load-breaking switch is an interlock device of three-phase. The VCB is operated by electric spring or dependen t manu al. 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.
| 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 | KV | MIDDLE |
| No. | LBS | ||
| 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 |
