The ring network cabinet is assembled with 8MF profile, and the modulus hole E = 20mm is installed on the whole frame. FZN21-12D type load switch or FZRN21-12D type fuse combination electrical applianceis equipped in the ring network cabinet. This type of electrical appliance has disconnecting switch vacuum load switch, grounding half-opening, and both disconnecting switch and grounding switch have obvious fracture.
Isolation switch, vacuum load switch, grounding switch and cabinet door have perfecand reliable mechanical linkage and interlocking devices, which can effectively prevent misoperation and ensure safe maintenance.
It can be operated manually and electrically.The door of the measuring cabinet and the instrument door are provided with lead sealing pins.
| No. | Name | Unit | Parameter | |
| 1 | Rated voltage | kV | 12 | |
| 2 | Rated current | Load switchgear | - | 630 |
| Combined electrical cabinet | - | 125 | ||
| 3 | Rated short-circuit breaking current | kA | 31.5 | |
| 4 | Rated active load breaking current | A | 630 | |
| 5 | Rated short-time withstand current | kA | 20 | |
| 6 | Rated peak value withstand current | kA | 50 | |
| 7 | Rated power frequency withstand voltage Between phase, to ground/fracture | kV | 42/48 | |
| 8 | Lightning impulse withstand voltage Between phase, to ground/fracture | kV | 75/85 | |
| 9 | Mechanical life | cycles | 10000 | |
| 10 | Rated handover current | A | 3150 | |
| 11 | Operation mode | Manual or motor type | ||
| 12 | Protection grade | IP2X | ||
| No. | Name | Unit | Load switch unit | Combined electrical unit | Circuit breaker unit | ||
| 1 | Rated voltage | kV | 12 | 12 | 12 | ||
| 2 | Rated frequency | Hz | 50 | 50 | 50 | ||
| 3 | Rated current | A | 630 | 125 (depends on the fuse current) | 630 | ||
| 4 | Rated insulation level | 1min power frequency withstand voltage | Between phase, to ground | kV | 42 | 42 | 42 |
| Fracture | kV | 48 | 48 | 48 | |||
| Control and auxiliary circuit | kV | 2 | 2 | 2 | |||
| Lightning impulse withstand voltage | Between phase, to ground | kV | 75 | 75 | 75 | ||
| Fracture | kV | 85 | 85 | 85 | |||
| 5 | Rated short-time withstand current | kA/s | 20、25/4 | —— | 20、25/4 | ||
| 6 | Rated peak value withstand current | kA | 50、63 | —— | 50、63 | ||
| 7 | Rated short-circuit closing current | kA | 50、63 | Limited to the HV fuse | 50、63 | ||
| 8 | Rated short-circuit breaking current | kA | —— | Limited to the HV fuse | 20、25 | ||
| 9 | Rated transfer current | A | —— | 1700 | —— | ||
| 10 | Rated active load breaking current | A | 630 | —— | —— | ||
| 11 | Rated closed loop breaking current | A | 630 | —— | 630 | ||
| 12 | Mechanical life | Load switch/circuit breaker | cycles | 10000 | 10000 | 20000 | |
| 12 | Disconnector/grounding switch | 3000 | 3000 | 3000 | |||
| 13 | Circuit resistance | μΩ | ≤150 | —— | ≤150 | ||
| 14 | Rated inflation pressure (gauge pressure at 20℃) | Mpa | 0.04 | 0.04 | 0.04 | ||
| 15 | Gas annual relative leakage rate | Year | ≤0.01% | ≤0.01% | ≤0.01% | ||
| 16 | Protection grade | Cabinet body | IP4X | IP4X | IP4X | ||
| Gas box | IP67 | IP67 | IP67 | ||||
| 17 | Burning arc test | kA/s | 25/0.5 | 25/0.5 | 25/0.5 | ||
| 18 | Compartment (IP code) | / | IP2XC | ||||
| Gas box (IP code) | / | IP67 | |||||
| Cabinet body (IP code) | / | IP41 | |||||
| Cabinet body (IK code) | / | IP10 | |||||
| 19 | Insulation gas | / | Sf6 | ||||
