| Customization: | Available |
|---|---|
| Breaking Capacity: | Low Voltage Circuit Breakers |
| Operation: | Electric Type |
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Indoor high-voltage AC vacuum load switch-fuse combination("combination" for short) is used in power systems with an AC frequency of 50 Hz and a rated voltage of 40.5 kV to break load currents, overload currents and short-circuit currents. It particularly applies to the places needing control, protection for oil-free, maintenance-free, frequently-operated and ring network power supply units and terminal power supply transformers.
Ambient temperature:-40ºC-+40ºC (below 35ºC within 24 hours)
Relative humidity:≤95% (daily average) or ≤90% (monthly average)
Altitude:≤1000m
The combined electric apparatus is a three-pole linkage structure
The operation mode of the vacuum arc extinguishing chamber of the combined electric apparatus adopts the electric spring operating mechanism for closing, and the tripping electromagnet for opening, and can also be used for manual closing and opening
A reliable mechanical interlock device is installed between the vacuum interrupter, the isolation switch and the ground switch of the combined electric appliance, and the isolation switch and the ground switch are operated by the same shaft
| Name | Unit | Data | |
| Rated voltage | kV | 40.5 | |
| Rated frequency | Hz | 50 | |
| Rated maximum current of the fuse | A | 63 | |
| Insulation level | 1min power-frequency withstand voltage | kV | Vacuum gap, interpole, pole-to-ground: 95; isolating gap: 110 |
| Lightning impulse withstand voltage | kV | Vacuum gap, interpole, pole-to-ground: 185; isolating gap:215 | |
| Rated peak withstand current | kA | 50 | |
| 4s rated short-time withstand current | kA | 20 | |
| Rated breaking current of the active load | A | 1250 | |
| Rated closed-loop breaking current | A | 1250 | |
| Rated breaking current of cable during charge | A | 21 | |
| Rated short-circuit breaking current | kA | 31.5 | |
| Rated transfer current | A | 1200 | |
| Fuse model | XRNT3A-40.5/-31.5 | ||
| Output energy of the fuse striker | J | 2-5 | |
| Rated short-circuit making current | kA | 80(expected peak value) | |
| Rated peak withstand current of the earthing switch | kA | 50 | |
| 4s rated short-time withstand current of the earthing switch | kA | 20 | |
| Rated voltage (DC or AC) of the auxiliary circuit | V | 220;110 | |
| Mechanical life | Cycles | 10000 | |
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