Indoor High-Voltage Load Switch-Fuse Combo (FZN25/FZRN25-12D)
The FZN25-12D indoor AC medium-voltage vacuum load switch (hereinafter referred to as load switch) and the FZRN25-12D indoor AC medium-voltage vacuum load switch-fuse combination device (hereinafter referred to as combination device) are used for control and protection in three-phase AC 50Hz, 10kv(12kv) distribution systems. They are widely applied in industrial and mining enterprises as well as in urban and rural building substations. The combination device consists of a load switch and a fuse, providing protection for electrical equipment such as transformers.
The vacuum arc extinguishing chamber provides stable and reliable performance with a long electrical lifespan, high number of operations, and strong switching capability.
The switch integrates with the operating mechanism, combining the functions of an isolating switch, load switch, and grounding switch into one compact and small structure.
The direct-action isolating distance and the vacuum arc extinguishing chamber are connected in series, with a unique operation sequence linkage that completes the operation in one step.
The load switch, grounding switch, and active door are mechanically interlocked to prevent misoperation, ensuring safety and reliability.
The spring energy storage operating mechanism allows for both electric and manual operation, which is convenient for remote control requirements. The power source for switching operations can be either AC or DC
| serial number | Tech. parameters | unit | data | ||
| FZN25-12D/T630-20 | FZN25-12D/T125-31.5 | ||||
| 1 | Rated voltage | kW | 12 | ||
| 2 | Rated current | A | 630 | ≤200 | |
| 3 | Rated frequency | Hz | 50 | ||
| 4 | Rated insulation level | 1min power frequency withstand voltage | kV | Interrupter 30: to the ground, 75 between phases: isolation fracture 48 | |
| Lightning impulse withstand voltage (peak) | 75 to the ground and phase, and 85 to isolate the fracture | ||||
| 5 | Rated short-time withstand current(thermal stability) | kA | 20 | 31.5 | |
| 6 | Rated duration of short-circuit | s | 4 | 4 | |
| 7 | Rated peak withstand current (dynamic stability) | kA | 50 | 80 | |
| 8 | Rated active load breaking current | A | 630 | 125 | |
| 9 | Rated closed-loop breaking current | A | 630 | 125 | |
| 10 | Rated cable-charging breaking current | A | 10 | ||
| 11 | Rated capacity of no-load transformer for breaking | kVA | 1600 | ||
| 12 | Rated short-circuit breaking current | kA | 20 | 31.5 | |
| 13 | Rated transfer current | A | 2000 | ||
| 14 | Fusible cutout model | SDLAJ-12/SFLAJ-12 | |||
| 15 | Impactor output | J | 2024-2-5 | ||
| 16 | Rated short-circuit making current (peak value) | kA | 50 | 80 | |
| 17 | Earth switch rated short-time withstand current(thermal stability) | kA | 20 | ||
| 18 | Earth switch Rated short-circuit duration | s | 2 | ||
| 19 | Rated peak withstand current of earth switch (dynamic stability) | kA | 50 | ||
| 20 | Auxiliary loop rated voltage | V | 220 | 110 | |
| 21 | Mechanical life | times | 10000 | ||
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Email：lycnelectric@163.com
Add：No. 9 Duyu Street, Luolong District, Luoyang City, Henan Province
