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High Voltage Disconnect Switch
FZN25-12/FZRN25-12 Vacuum Load Switch
The FZN25 and FZRN25 series vacuum load switches and combined electrical appliances are suitable for load control and short-circuit protection in three-phase AC 50Hz ring networks or terminal power supplies and industria
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Overview
The FZN25 and FZRN25 series vacuum load switches and combined electrical appliances are suitable for load control and short-circuit protection in three-phase AC 50Hz ring networks or terminal power supplies and industrial electrical equipment. The load switches connect and disconnect loads, closed-loop current, and unloaded transformer and cable charging current. The combined electrical appliances can interrupt any current up to the rated short-circuit current. They employ direct-acting isolation contacts and vacuum arc chamber linkage. Both manual and electric functions are available.
The unique transmission structure design of FZN25 and FZRN25 ensures that the arc-extinguishing chamber only bears high pressure at the moment of closing and opening, resulting in a small size and light weight. FZN25 and FZRN25 can achieve one-time operation of the isolation break and the arc-extinguishing chamber break.
The FNZ25 and FZRN25 have a grounding valve between the stationary contact and the conductive cylinder of the moving contact, which is linked to the grounding switch, ensuring both safety and convenient maintenance.
Model Meaning
Main technical parameters
| Project | Unit | Parameter | ||
| FZN25-12D/T630-20 | FZRN25-12D/T125-31.5 | |||
| Rated voltage | kV | 12 | ||
| Rated frequency | HZ | 50 | ||
| Rated current | A | 630 | 125 | |
| Rated insulation level | 1-minute power frequency withstand voltage | kV | Arc-extinguishing chamber fracture 30; to ground, phase-to-phase 42; isolation fracture 48 | |
| Lightning impulse withstand voltage | kV | Ground-to-ground, phase-to-phase 75: isolation break 85 | ||
| Rated dynamic current (peak) | KA | 50 | – | |
| 4S thermally stable current | KA | 20 | – | |
| Rated active load breaking current | A | 630 | 125 | |
| Rated closed-loop breaking current | A | 630 | 125 | |
| Rated cable charging breaking current | A | 10 | 10 | |
| Breaking off no-load transformer capacity | kVA | 1250 | 1250 | |
| Rated short-circuit breaking current | KA | – | 31.5 | |
| Rated transfer current, rated handover current | A | – | 2000 | |
| Fuse model | – | SDLAJ-12 SFLAJ-12 | ||
| Impactor output energy | J | – | 2-5(中等) | |
| Rated short-circuit making current | KA | 50 | ||
| Rated dynamic stability current of grounding switch | KA | 50 | ||
| Grounding switch 2S thermal stability current | KA | 20 | ||
| Auxiliary circuit rated voltage | V | AC/CD :220/110 | ||
| Mechanical life | 次 | 10000 | ||
FZRN25-12D/125-31.5 Vacuum Load Switch-Fuse Combination Appliance Outline and Installation Dimensions (mm)
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