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High Voltage AC Vacuum Load Switch-Fuse Combination Apparatus FTD9-12RD from China Suppliers and Factory
Detail introduction
This product is suitable for three-phase AC 50/60HZ, 12KV power systems, used in conjunction with complete distribution equipment, ring main unit, modular substations, etc. The layout, technical characteristics, appearance, and dimensions of this combination electrical appliance are basically the same as those of the FTD9-12D vacuum load switch, and it is particularly suitable for installation in small and limited spaces.
Quality standard
This product is complied with the following standards:
- GB/T16926 High voltage AC load switch- fuse combination device
- NB/T10283 Guidelines for Testing High Voltage AC Load Switch Fuse Combination Electrical Appliances
- IEC62271-105 High voltage switchgear and control equipment - Part 105: 1KV~52KV AC load switch fuse combination
Service Conditions
a Environmental temperature
- 25℃ ~ +40℃
b Altitude
≤ 1000m
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 ≤1.8x10-3MPa
Monthly average relative humidity ≤ 90%
Daily average vapor pressure ≤ 2.2x10-3 MPa
Monthly average vapor pressure ≤1.8x10-3MPa
d Seismic grade
seismic intensity ≤ 8
e Applicable location
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 Date
| Item | Unit | Parameter | |
| Combination device | |||
| 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 | Depends on the fuse | |
| Rated short-circuit breaking current (r.m.s) | kA | Depends on the fuse | |
| Rated short-time withstand current and time | kA/s | / | |
| Rated peak withstand current | kA | / | |
| Rated short-circuit making current (peak) | kA | Depends on the fuse | |
| Rated breaking current of single/back-to-back capacitor group | A | / | |
| Rated capacitor bank making current | kA | / | |
| Rated handover (transfer) current | A | 3150 | |
| Mechanical life | Times | 5000 | |
| Main circuit resistance of each phase | mΩ | ≤250 | |
| Clearance between open contacts | mm | 9±1 | |
| Contacting travel | mm | 5.5±1 | |
| Contact closing bounce time | mm | / | |
| Three-phase asynchronous closing and opening | ms | ≤2 | |
| Average opening speed (contact just opened -6mm) | m/s | 0.9-1.3 | |
| Average closing speed (contact just opened -6mm) | m/s | / | |
| Rated contact pressure | N | 1000±100 | |
| Opening time (at rated voltage) | ms | / | |
| Closing time (at rated voltage) | ms | / | |
| Rated operating sequence | / | ||
Typical outline dimensions (fit) and structural diagram
FTD9-12R (inter-phase distance P=210) outline dimension diagram of vacuum load switch-fuse combination apparatus
(this diagram shows the product in the upright position, and the product can also be installed in an inverted position.)
FTD9-12RD (inter-phase distance P=210) outline dimension diagram of vacuum load switch-fuse combination apparatus
(this diagram shows the product in the upright position, and the product can also be installed in an inverted position.)
Frequently Asked Questions
What power systems and equipment is this product suitable for?
This product is designed for three-phase AC 50/60HZ, 12KV power systems. It is commonly used in conjunction with complete distribution equipment, ring main units (RMU), and modular substations.
Is this combination electrical appliance suitable for limited spaces?
Yes. The layout, technical characteristics, appearance, and dimensions of this combination electrical appliance are basically identical to the FTD9-12D vacuum load switch, making it particularly ideal for installation in small and limited spaces.
Which quality standards does the device comply with?
The product fully complies with GB/T16926 (High voltage AC load switch-fuse combination device), NB/T10283 (Guidelines for Testing High Voltage AC Load Switch Fuse Combination Electrical Appliances), and IEC62271-105 standards.
What are the standard environmental conditions required for operation?
The normal operating conditions include an ambient temperature range of -25℃ to +40℃, an altitude of ≤ 1000m, daily average relative humidity ≤ 95%, monthly average relative humidity ≤ 90%, and a seismic intensity level of ≤ 8. The installation site should also be free from dripping water, fire hazards, chemical corrosive gases, and severe vibrations.
Can the vacuum load switch-fuse combination apparatus be installed upside down?
Yes. Both the FTD9-12R and FTD9-12RD models are shown in their upright positions in the structural diagrams, but they are fully designed to support installation in an inverted position as well.