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FLN36-6
FLN36-6 SF6 Load Break Switch
The FLN36-6 SF6 6kV load break switch is a compact indoor switchgear designed specifically for 6kV medium-voltage distribution networks. It utilizes SF6 gas insulation and arc-extinguishing technology, enabling safe switching of load current, circuit isolation, and protection of distribution equipment.
Manufactured according to relevant international and national standards, the FLN36-6 ensures reliable and stable performance. It has a rated voltage of 6kV, a frequency of 50Hz, a rated current of 630A, and a mechanical life exceeding 1000 operations, making it suitable for long-term use in medium-voltage distribution systems.
The switch features a modular structure with an internal epoxy resin-encapsulated sealed cavity filled with SF6 gas, providing strong insulation and safe operation. A K-type single-spring operating mechanism allows for reliable switching between closed, open, and grounded positions.
The FLN36-6 SF6 6kV load break switch is widely used in ring main units (RMUs), cable distribution boxes, and industrial power distribution systems. It can safely interrupt normal load current, cable charging current, and transformer no-load current in medium-voltage distribution networks.
Key Specifications
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Rated Voltage: 6kV
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Rated Current: 630A
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Frequency: 50Hz
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Mechanical Life: ≥1000 operations
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Application: RMU, cable branch boxes, medium-voltage distribution networks
Features
1. Modular Design for Easy Installation and Maintenance
The FLN36-6 SF6 6kV load break switch features a standardized modular design that allows each component to be independently removed and replaced. This structure simplifies installation and enables quick integration into ring main units (RMU) and cable branch boxes. During maintenance, individual parts can be serviced without dismantling the entire unit, reducing downtime and maintenance costs.
2. Reliable SF6 Insulation and Arc-Quenching Performance
The FLN36-6 SF6 6kV load break switch uses SF6 gas as the insulation and arc-extinguishing medium, providing strong dielectric performance and safe interruption of load currents at the 6kV voltage level. The mechanism box includes an SF6 gas pressure gauge that monitors internal pressure in real time, ensuring stable insulation performance and preventing operational failures caused by gas leakage.
3. Reliable Operating Mechanism with Flexible Control
The FLN36-6 SF6 6kV load break switch is equipped with a K-type single-spring operating mechanism, which automatically stores energy for the opening spring after the closing operation. This design ensures smooth operation, reliable switching, and long mechanical life. The switch supports both manual and electric operation, allowing remote control in automated distribution systems while maintaining manual backup for emergency situations.
4. Advanced Interlocking Protection
A complete mechanical interlocking system prevents unsafe operations such as switching under grounding conditions or incorrect switching sequences. The interlocking mechanism ensures coordination between the load switch, grounding switch, and cabinet door. A built-in position indicator clearly displays the three operating states: closed, open, and grounded, improving operational safety.
5. Strong Environmental Adaptability
The FLN36-6 SF6 6kV load break switch is designed to operate reliably in a wide range of environments. It supports ambient temperatures from −15°C to +40°C and installation altitudes up to 2000 meters. The sealed structure provides resistance to dust and humidity, making the switch suitable for industrial facilities, urban distribution networks, and commercial buildings.
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Specification
| Item | Unit | Data | |
| Rated voltage | kV | 6 | |
| Main circuit lightning impulse withstand voltage (Same,relative/between fracture surfaces) (peak value) | kV | 40 | 46 |
| Main circuit 1-minute power frequency withstand voltage (Same,relative/between fracture surfaces) (peak value) | kV | 20 | 23 |
| 1-minute power frequency withstand voltage of auxiliary circuit | kV | 2500 | 23 |
| 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
Can the FLN36-6 SF6 6kV load break switch be used with fuses? What are the advantages?
Yes. The FLN36-6 SF6 6kV load break switch can be combined with current-limiting fuses to form a switch-fuse protection unit. The load switch handles normal load switching, while the fuse interrupts fault or short-circuit currents. This combination improves system protection and is widely used in ring main units (RMU) and transformer protection circuits.
Can the product support both manual and electric operation?
Yes. The FLN36-6 SF6 6kV load break switch supports manual and motorized operation modes. Electric operation allows remote control and automation in modern distribution systems, while manual operation serves as a backup for maintenance or emergency situations. The two modes are designed with interlocking mechanisms to prevent interference.
The mechanical life is about 1000 cycles. Does the whole switch need replacement afterward?
No. The mechanical life rating indicates the tested endurance of the operating mechanism. After reaching this number of operations, the switch does not necessarily need replacement. Regular inspection and maintenance can extend service life if the switch remains in good working condition.
What happens if the SF6 gas pressure becomes too low?
Low SF6 gas pressure may reduce the insulation strength and arc-quenching capability of the switch. This could increase the risk of switching failure or insulation breakdown. Operators should monitor the gas pressure gauge and refill or service the unit if the pressure drops below the recommended range.
What are the installation differences between FLN36-6 and FLN36-3.3 load switches?
The overall installation structure is similar, but the rated voltage level and insulation requirements are different. The FLN36-6 SF6 6kV load break switch is designed for 6kV distribution networks, which may require slightly larger insulation spacing and different system configurations compared with 3.3kV models.
What applications are suitable for the FLN36-6 load switch?
The FLN36-6 SF6 6kV load break switch is mainly used in medium-voltage distribution networks, including ring main units (RMU), cable branch boxes, industrial power systems, and urban distribution grids. It can safely interrupt normal load current, cable charging current, and no-load transformer current, ensuring reliable power distribution.
Related Applications
Industrial Medium-Voltage Distribution Networks
The FLN36-6 SF6 6kV load break switch is widely used in medium-voltage distribution systems for industrial facilities, including mechanical manufacturing plants, chemical processing support facilities, and building material factories.
Installed in ring main units (RMU) within plant substations, it distributes 10kV (reduced to 6kV) power to workshops, warehouses, and auxiliary equipment. The switch enables reliable load switching and equipment protection for production machinery, ventilation systems, and lighting networks.
Urban Ring Main Distribution Networks
The FLN36-6 SF6 6kV load break switch is well suited for urban ring main distribution systems. It is typically installed in outdoor ring main cabinets or cable branch boxes located along urban streets or near residential and commercial areas.
The switch performs feeder control and load distribution within the city’s medium-voltage network. In the event of a line fault, it allows rapid switching and sectionalizing, preventing fault propagation and ensuring a stable power supply for residential communities, commercial buildings, and public infrastructure.
High-Rise Building Power Distribution
For high-rise residential complexes, office towers, and hotels, the FLN36-6 SF6 6kV load break switch supports reliable medium-voltage distribution within building substations. Installed in basement or underground distribution rooms, it helps manage the conversion and distribution of high-voltage power to internal building distribution systems.
The switch provides stable electricity for critical equipment such as elevators, central air-conditioning systems, water supply pumps, and lighting networks. Its compact design fits limited installation spaces, while optional remote operation enables efficient facility management.
Power Distribution for Large Public Facilities
The FLN36-6 SF6 6kV load break switch is also suitable for auxiliary power distribution in large public facilities, including shopping malls, sports arenas, and exhibition centers. It supports power distribution for key systems such as HVAC equipment, backup generator rooms, and fire protection systems.
With its reliable switching capability and stable 6kV operation, the switch helps maintain electrical safety and operational stability during high-traffic events or peak occupancy periods.
