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FLN36-3.3
FLN36-3.3 SF6 Load Break Switch
FLN36-3.3KV SF6 load switch is an indoor AC high voltage switchgear designed specifically for low voltage distribution network terminal scenarios. It uses high-purity SF6 gas as the insulation and arc extinguishing medium, and is strictly developed and manufactured in accordance with GB3804-2004 and IEC 60265-1 standards. The rated voltage is 3.3KV, the rated frequency is 50Hz, the rated current can reach 630A, and the mechanical life is ≥ 1000 cycles. This product adopts an inflatable cavity structure injection molded with epoxy resin, and the common moving contact can achieve a three position rotation operation of “closing opening grounding”. The output end is equipped with a touchable cable front connector, which is suitable for installation in the cable branch box. It is mainly used for breaking and closing the normal load current of the distribution network terminal, and plays a reliable control and protection role for the line and small distribution equipment. It is widely suitable for the use needs of low voltage level and small capacity distribution scenarios, balancing safety and economy.
Features
1. Strong adaptability, suitable for low voltage terminal scenarios:
Optimized for the characteristics of 3.3KV low voltage level, it has a more compact size, occupies less installation space, and can be flexibly embedded in small cable branch boxes and terminal distribution boxes without additional expansion and modification, adapting to the narrow installation environment of various low voltage distribution network terminals.
2. Reliable insulation arc extinguishing and high operational stability:
SF6 gas is used as the insulation and arc extinguishing medium, with fast arc extinguishing speed, no open flame, and no dust pollution. The rated pressure of SF6 is controlled at 0.04-0.05MPa at 20 ℃, and the insulation performance is not affected by environmental humidity, which can effectively avoid insulation aging problems in low voltage scenarios and ensure long-term stable operation.
3. Easy and safe operation, excellent protective performance:
equipped with a simple manual spring operating mechanism, with low operating force and simple steps, and can be remotely controlled by adding an electric operating device according to needs; The rear of the body is equipped with a safety diaphragm, which can release gas when the internal pressure is too high. At the same time, there is a reliable mechanical interlock between the load switch, grounding switch, and cabinet door to prevent the risk of misoperation and ensure the personal safety of operators.
4. Extremely low maintenance cost and long service life:
adopting a fully sealed inflation structure, SF6 gas leakage is minimal, and there is no need to frequently replenish gas. Only regular checks of gas pressure and operating mechanism status are required for daily use; The components are made of high-strength and corrosion-resistant materials, with minimal mechanical wear and suitable for long-term continuous operation, significantly reducing maintenance labor and material costs in the later stage.
5. Outstanding cost-effectiveness, suitable for batch applications:
Optimizing production costs for the batch deployment needs of low-voltage distribution network terminals, while ensuring core performance standards, significantly improving cost-effectiveness, and standardizing production processes to ensure product consistency, suitable for batch installation and use of low-voltage distribution networks in industrial parks and residential areas.
This product is suitable for environments with temperatures ranging from -15 ℃ to+40 ℃, an altitude not exceeding 1000m, an average daily relative humidity not exceeding 95%, and an average monthly relative humidity not exceeding 90%. It is suitable for places without obvious dust, corrosive gases, flammable vapors, and severe vibrations;
The rated short-time withstand current can reach 20kA/2s, the rated peak withstand current is 50kA, and the cable charging current and no-load transformer current can be disconnected; Supports both manual and electric operation modes, and the operating voltage can be selected as AC220V or DC220V. Special environment (such as high altitude and high humidity) adaptation versions can be customized according to actual needs; The implementation standards include GB3804-2004 “3.6kV~40.5kV High Voltage AC Load Switches” and IEC 62271-105:2002 “High Voltage Switchgear and Control Equipment Part 105: AC Load Switches Fuse Combination Electrical Appliances”. For detailed technical specifications, ordering instructions, installation manuals, or sample requests, please contact the manufacturer’s technical support team for exclusive solutions.
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Specification
| Item | Unit | Data | |
| Rated voltage | kV | 3.3 | |
| Main circuit lightning impulse withstand voltage (Same,relative/between fracture surfaces) (peak value) | kV | 20 | 23 |
| Main circuit 1-minute power frequency withstand voltage (Same,relative/between fracture surfaces) (peak value) | kV | 10 | 12 |
| 1-minute power frequency withstand voltage of auxiliary circuit | kV | 2500 | 2500 |
| Rated current | A | 630 | |
| Transfer current | A | ||
| Rated short-circuit closing current (peak) | kA | 50 | |
| Rated short-time withstand current | kA | 20 | |
| Rated short-circuit duration | S | 3 | |
| Rated peak withstand current (peak) | kA | 50 | |
| Grounding switch closing current (peak) | kA | 20 | |
| Peak withstand current of grounding switch (peak) | kA | 50 | |
| Mechanical lifespan of load switch | times | 3000 | |
| Mechanical lifespan of grounding switch | times | 2000 | |
| Rated pressure of arc extinguishing chamber (20 °C) | bar | 1.45 | |
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FAQs
What are the core differences between FLN36-3.3KV SF6 load switches and other FLN36 series products with higher voltage levels?
The core difference lies in voltage adaptability and structural design: this product is optimized for 3.3KV low-voltage scenarios, with a more compact size, simpler operating mechanism, and parameters such as rated short-time withstand current that are suitable for low-voltage load requirements, resulting in lower production costs and higher cost-effectiveness; Products with higher voltage levels require strengthened insulation structures, improved arc extinguishing capabilities, larger volumes, and better core parameters, making them suitable for medium and high voltage distribution network scenarios. The two are applicable to different scenarios and core performance parameters, without distinguishing between performance advantages and disadvantages, and are only suitable for different voltage level requirements.
Does the SF6 gas of this product need to be replenished regularly? How long is the replenishment cycle approximately?
No need for frequent supplementation. The product adopts a fully sealed inflatable structure, and the SF6 gas leakage is strictly controlled at the industry’s lowest standard. Under normal operation, the gas replenishment cycle can reach 8-10 years; In daily life, it is only necessary to monitor the gas pressure through the pressure gauge on the front of the mechanism box. When the pressure is lower than the rated value (0.04MPa), it is necessary to promptly contact professional personnel for leak detection and supplement the gas.
Can this product be used for outdoor installation? What conditions must be met for outdoor use?
This product is designed for indoor use and cannot be directly used for outdoor installation. If outdoor use is necessary, outdoor protective cabinets must be installed with a protection level of IP54 or above to ensure effective isolation from external environmental influences such as rainwater, dust, and ultraviolet radiation; At the same time, it is necessary to select a special environment adaptation version, optimize the sealing structure and material weather resistance, and avoid environmental factors causing a decrease in product insulation performance or mechanical failure.
How to troubleshoot and handle product malfunctions?
Firstly, check the status of the mechanical interlock and confirm whether the position of the grounding switch and the closed state of the cabinet door meet the operating requirements. If the interlock is not unlocked, it needs to be adjusted to the correct position before operation; Next, check the energy storage status of the operating mechanism spring. The manual operation version can re store energy and try to operate, while the electric operation version needs to check whether the power supply and wiring are normal; If there are no problems with the above investigation, it may be due to the internal moving contact being stuck or the SF6 gas pressure being too low. The operation should be stopped immediately, and professional technicians should be contacted for on-site inspection and maintenance. It is strictly prohibited to disassemble the equipment by oneself.
Related Applications
Low voltage distribution network terminal in small industrial parks: mainly used for low-voltage distribution terminal control in small processing plants and handicraft parks. In such scenarios, the power load is small and the voltage level requirement is low. This product can achieve load current disconnection and closing of workshop production lines and office area power lines, ensuring stable supply of various small production equipment and office power. At the same time, the compact structure adapts to the installation needs of small distribution rooms and cable branch boxes in the park, reducing the space occupied by distribution equipment.
Low voltage distribution branch in residential areas: Suitable for low voltage distribution branch control in multi story residential areas and small villa areas, installed in the distribution shaft or outdoor cable branch box of each building in the community, responsible for branching the 3.3KV voltage of the total distribution in the community to each unit building, achieving graded control and protection of unit building lighting, elevators, and residential circuits, avoiding single circuit failures that affect the electrical safety of the entire community, and the low maintenance feature can reduce property management costs in the later stage.
Small public building power distribution system: used for power distribution control in small public buildings such as community service centers, small supermarkets, and village level health centers. These buildings have concentrated electricity demand and small capacity. This product can be used as the core switch equipment for power distribution terminals to control the electricity consumption of air conditioning, lighting, office equipment, and medical auxiliary equipment, ensuring safe and stable electricity use. At the same time, the simple operation method is convenient for daily management and emergency operations of staff.
Distribution of auxiliary areas in mines: Adapt to the low-voltage distribution needs of ground auxiliary areas in mines (such as mine office areas, maintenance workshops, and material warehouses). The electrical load in this area is mainly for auxiliary equipment, with a voltage level requirement of 3.3KV. The high safety and anti-interference ability of the product can adapt to the complex environment of the mine ground, effectively avoiding the impact of dust and slight vibration on equipment operation, ensuring stable power supply in auxiliary areas, and providing supporting power support for normal production in mines.
