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China FTD9-12D Indoor High Voltage AC Vacuum Load Switch - Reliable Suppliers & Factory for 12KV Power Systems
Quality standard
Product quality assurance is based on continuous improvement of research, development, design, and production processes that meet all aspects of the quality system requirements. It fully complies with the latest versions or modified versions of the following standards, specifications, and guidelines, and is not limited to them.
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IEC62271-103 High voltage switchgear and control equipment - Part 103: 1KV~52KV AC load switches
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IEC62271-105 High voltage switchgear and control equipment - Part 105: 1KV~52KV AC load switch fuse combination
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GB/T3804 3.6kV~40.5kV High Voltage AC Load Switch
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GB/T16926 High voltage AC load switch- fuse combination device
Service Conditions
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a. Environmental temperature: -25℃ ~ +40℃;
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b. Altitude: ≤ 1000m;
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c. Relative humidity:
Daily average relative humidity ≤ 95%
Monthly average relative humidity ≤ 90%
Daily average vapor pressure ≤ 2.2x10-3 MPa
Monthly average vapor pressure ≤ 1.8x10-3 MPa; -
d. Seismic grade: seismic intensity ≤ 8;
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e. The applicable location is free from dripping water, flammable and explosive hazards, chemical corrosive gases, and severe vibrations.
※Note: When the usage environment deviates from normal usage conditions, please consult with our company to determine.
Technical Data
| Item | Unit | Parameter | |
| Rated frequency | Hz | 50/60 | |
| Rated voltage | kV | 12 | |
| Rated power frequency withstand voltage (1 minute, r.m.s) | Phase to phase and phase to ground | KV | 42 |
| Isolation fracture | 48 | ||
| Control and auxiliary circuits | 2 | ||
| Rated lightning impulse withstand voltage (peak) | Phase to phase and phase to ground | kV | 75 |
| Isolation fracture | 85 | ||
| Rated current | A | 630 | |
| Rated short-circuit breaking current (r.m.s) | kA | / | |
| Rated short-time withstand current and time | kA/s | 20/4 | |
| Rated peak withstand current | kA | 50 | |
| Rated short-circuit making current (peak) | kA | / | |
| Rated breaking current of single/back-to-back capacitor group | A | / | |
| Rated capacitor bank making current | kA | / | |
| Rated handover (transfer) current | A | 1 | |
| Mechanical life | Times | 5000 | |
| Main circuit resistance of each phase | mΩ | ≤ 100 | |
| Clearance between open contacts | mm | 9 ± 1 | |
| Contacting travel | mm | 5.5 ± 1 | |
| Contact closing bounce time | mm | ≤ 2 | |
| Three-phase asynchronous closing and opening | ms | ≤ 2 | |
| Average opening speed (contact just opened - 6mm) | m/s | 0.9 -1.3 | |
| Average closing speed (6mm - contact just opened) | m/s | 0.4 ~ 0.8 | |
| Rated contact pressure | N | 1000 ± 100 | |
| Opening time (at rated voltage) | ms | / | |
| Closing time (at rated voltage) | ms | / | |
| Rated operating sequence | / | ||
Technical characteristics
Reasonable design and novel structure
The operating mechanism is integrated with the "five-prevention" interlocking mechanism, and modular design is adopted for components such as the (load switch) solid-sealed pole and the earthing switch. These components are combined into a single unit through a common mounting frame.
The operating panel indicators are integrated with the primary circuit indicators, providing clear, simple, and easy-to-understand indications. The interlocking design is rationally integrated to form a "foolproof" operating procedure, making incorrect operations "impossible".
The operating panel indicators are integrated with the primary circuit indicators, providing clear, simple, and easy-to-understand indications. The interlocking design is rationally integrated to form a "foolproof" operating procedure, making incorrect operations "impossible".
Miniaturization
Compared with air-insulated switches of the same model and specification, the device has a smaller volume, with a cabinet width of only 500 mm. It is a paragon of the new generation of miniaturized air-insulated switchgear.
Less maintenance
The device uses maintenance-free vacuum (arc extinguishing chamber) switch (poles), which are virtually maintenance-free, have a long service life, and offer low operating costs.
Visual Consistency
VTD9 circuit breaker, FTD9 load switch, and GTD isolating switch have identical external dimensions, facilitating the expansion and combination of switchgear cabinets.
Typical outline dimensions (fit) and structural diagram
FTD9 - 12/630 (inter-phase distance P=210)
Outline dimension drawing of vacuum load switch (this drawing is for normal installation, but it can also be reversed)
FTD9 - 12D/630 (inter-phase distance P=210)
Outline dimension drawing of vacuum load switch (this drawing is for normal installation, but it can also be reversed)
Frequently Asked Questions
Which international and national standards do these load switches comply with?
The product fully complies with IEC62271-103 and IEC62271-105 international standards, as well as GB/T3804 and GB/T16926 national standards, ensuring reliable quality and safety.
What are the environmental temperature limits for normal operation?
The switch is designed to operate normally within an environmental temperature range of -25℃ to +40℃.
What is the maximum altitude suitable for this equipment?
The standard rated altitude for this equipment is ≤ 1000m. If your installation location exceeds this altitude, please consult with our company for custom parameters.
What are the main advantages of the miniaturized design?
Compared to standard air-insulated switches, this device features a smaller volume with a cabinet width of only 500 mm. This makes it ideal for compact spaces while maintaining high performance.
Can the FTD9 vacuum load switch be installed in a reversed position?
Yes, although the provided outline drawings show normal installation, the structural design allows the vacuum load switch to be installed in a reversed configuration.
What is the mechanical life span of this switch?
The switch is built for high durability with a tested mechanical life of up to 5000 operations (times).