Claire
Mr.Fu
Claire
High-Voltage Vacuum Load Switch FZ(R)N21C-40.5D for Renewable Energy | China Suppliers & Factory
| 1 | Vacuum load switch |
| 2 | R: With fuse base |
| 3 | Indoor |
| 4 | Design serial number |
| 5 | Rated voltage (kV) |
| 6 | D: With grounding switch |
| 7 | T: Spring operating mechanism |
| 8 | Maximum rated current of fuse (A) |
| 9 | Rated short-circuit breaking current of fuse (kA) |
a) Ambient temperature: maximum +65°C, minimum -40°C;
b) Ambient humidity:
Daily average relative humidity ≤ 95%, monthly average relative humidity ≤ 90%;
Daily average vapor pressure ≤ 2.2 kPa, monthly average vapor pressure ≤ 1.8 kPa;
c) Altitude: not exceeding 4000 meters;
d) Seismic intensity: not exceeding 8 degrees;
e) Installation site free from fire and explosion hazards;
f) Ambient air not significantly polluted by dust, corrosive or flammable gases, vapors, or salt mist.
Note: Requirements beyond normal service conditions shall be negotiated with the manufacturer.
4.1 The main technical parameters of the load switch are shown in Table 1.
| No. | Parameter | Unit | Load Switch | Combination Apparatus | |
|---|---|---|---|---|---|
| 1 | Rated Frequency | Hz | 50 | ||
| 2 | Rated Voltage | kV | 40.5 | ||
| 3 | Power Frequency Withstand Voltage (1 min) | Phase & Earth / Vacuum Gap | kV | 95 Note * | |
| Isolation Gap | kV | 118 Note * | |||
| 4 | Rated Lightning Impulse Withstand Voltage (Peak) | Phase & Earth / Vacuum Gap | kV | 185 Note * | |
| Isolation Gap | kV | 215 Note * | |||
| 5 | Auxiliary & Control Circuit Power Frequency Withstand Voltage (1 min) | kV | 2 | ||
| 6 | Rated Current | A | 630, 1250 | Max. Rated Current of Fuse: 63, 80, 100 | |
| 7 | Rated Short-Circuit Breaking Current | kA | — | 31.5, 40, 50 | |
| 8 | Rated Active Load Breaking Current | A | 630, 1250 | — | |
| 9 | Rated No-Load Transformer Breaking Current | — | 63, 125 | — | |
| 10 | Rated Closed-Loop Breaking Current | A | 630, 1250 | — | |
| 11 | Rated Short-Time Withstand Current (4s) | kA | 25 | — | |
| 12 | Rated Peak Withstand Current | kA | 63 | — | |
| 13 | Rated Short-Circuit Making Current (Peak) | kA | 63 | — | |
| 14 | Rated Transfer Current | A | — | 2000 | |
| 15 | Rated Cable Charging Current | A | 21 | ||
| 16 | Rated Line Charging Current | A | 2.1 | ||
| 17 | Rated Earth Fault Breaking Current | A | 100 | ||
| 18 | Mechanical Life (Load Switch / Disconnector / Earthing Switch) | times | 10000 / 2000 / 2000 | ||
| 19 | Rated Operating Voltage | V | ≈ 220 / 110 | ||
| 20 | Permissible Cumulative Wear of Moving & Fixed Contacts | mm | 3 | ||
| 21 | Contact Gap | mm | 18 ± 1 | ||
| 22 | Over-Travel | mm | 4 ± 1 | ||
| 23 | Contact Bounce Time at Closing | ms | ≤ 5 | ||
| 24 | Three-Phase Closing/Opening Asynchronism | ms | ≤ 2 | ||
| 25 | Average Opening Speed | m/s | 1.5 ± 0.3 | ||
| 26 | Average Closing Speed | m/s | 0.8 ± 0.2 | ||
| 27 | Main Circuit Resistance (incl. Isolator) | μΩ | ≤ 200 | ≤ 300 (excluding fuse) | |
| 28 | Contact Pressure | N | 1600 ± 200 | ||
| 29 | Phase-to-Phase Center Distance | mm | 440 ± 3 (High-Altitude Type: 500 ± 3) | ||
Note *: Relevant parameters are adjusted according to altitude.
This three-phase load switch/combination unit consists of a frame, solid-insulated poles, a spring operating mechanism, isolation/earthing blades, sensors, and transmission parts. The isolating blades and vacuum interrupters are mounted on the frame. The earthing blades are at the bottom, and the operating mechanism (manual/electrical) is on the left side.
Working Principle
● Vacuum Switch: Uses a spring mechanism for closing and a solenoid/manual knob for opening. AC/DC power is supported. Status is visible through a window.
● Isolation/Earthing Blades: Mechanically interlocked; vacuum switch must be open first. Operated via handle with clear status indication.
● Fuse Trip: Uses striker-type fuses. Any phase fuse operation triggers a mechanical release to open the vacuum interrupter reliably (1–3J trip energy).
