40.5KV Remote Control High Voltage AC Indoor Vacuum Load Break Switch
FZ(R)N21-40.5D 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 oilfree, maintenance-free, frequently-operated and ring network power supply units and terminal power supply transformers.
The combination is characterized by large breaking capacity, high safety and stability, long electrical life, support for frequent operation, less maintenance, etc. It has an apparent isolating gap, an earthing switch with making capability, an electric spring actuator and remote control capability.
1.1 Technical parameters
| ltem | Unit | Reference value |
| 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/Δ-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 |
1.2 Technical parameters of the vacuum load switch
| Item | Unit | Reference value |
| Gap of contacts | mm | 17±1 |
| Compression travel of the contact spring | mm | 4±1 |
| Average making speed | m/s | 0.6±0.2 |
| Average breaking speed(gap: 6mm) | m/s | 1.5±0.2 |
| Breaking time | ms | ≤60 |
| Non-synchronous making/breaking of contacts of the three phases | ms | ≤2 |
| Bounce time in contact making | ms | ≤3 |
| Distance between live parts and phase-to-ground distance | mm | ≥300 |
| Circuit resistance between the upper and lower brackets | μΩ | ≤80 |
| Product standards | 1. GB 16926- 1997 High-voltage alternatingcurrent load switch-fuse combinations 2. IEC 60420 High-voltage alteratingcurrent load switch-fuse combinations |
| Ambient condition | 1. The altitude: under 1000M. 2. The ambient temperature: -40℃-+40℃. 3. The relative humidity of air: monthly≤90%, daily≤95%. |
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