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FLN36-40.5
FLN36-40.5 SF6 Load Break Switch
The FLN36-40.5 SF6 load break switch is a high-performance medium-voltage switchgear designed for reliable switching and protection in 40.5kV distribution networks. Suitable for both indoor and outdoor installation, it is widely used in main distribution lines, industrial power systems, substations, and large-scale energy infrastructure projects.
This SF6 load break switch uses high-purity SF6 gas as the insulating and arc-extinguishing medium, exhibiting excellent dielectric strength, reliable arc-extinguishing performance, and stable operation in harsh electrical environments.
Its design and manufacture comply with international standards including IEC 62271-105, IEC 61850, IEC 60694, IEC 62271-203, GB3804-2004, GB16926-2009, and GB/T 11022-2011.
The FLN36-40.5 load break switch has a rated voltage of 40.5kV, is compatible with dual-frequency (50/60Hz), and is available in rated currents of 5000A, 6300A, and 8000A. It is designed for high-capacity, long-distance power distribution systems. Its mechanical life exceeds 3500 operating cycles, ensuring long-term reliability and low maintenance requirements.
Toonice offers a full range of FLN36 load break switches, with voltage ranges from 12kV to 40.5kV, suitable for power companies, industrial facilities, and modern smart grid applications.
Features
The FLN36-40.5kV SF6 load break switch features high reliability, strong load capacity, and long service life. This switch uses high-purity SF6 gas as the insulation and arc-extinguishing medium, ensuring excellent dielectric properties and rapid arc extinguishing capability, thus achieving safe and efficient switching operation.
Advanced SF6 Gas Insulation: High-purity SF6 gas provides excellent dielectric strength and efficient arc extinguishing capability, ensuring safe operation and long-term reliability.
High Current Capacity: Rated current up to 8000A enables this switch to handle heavy-load power demands in large distribution networks and industrial power systems.
Rugged Sealing Structure: A high-strength epoxy resin cast structure combined with a corrosion-resistant alloy housing provides excellent environmental protection, durability, and a longer service life.
Reliable Operating Mechanism: An advanced spring-loaded operating mechanism ensures smooth and reliable operation of the switch’s closing, opening, grounding, and interlocking functions.
Smart Grid Compatibility: Supports remote control, real-time monitoring, fault diagnosis, and digital operation management, allowing seamless integration with modern smart grids and smart distribution systems.
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Specification
| Item | Unit | Data | |
| Rated voltage | kV | 40.5 | |
| Main circuit lightning impulse withstand voltage (Same,relative/between fracture surfaces) (peak value) | kV | 185 | 215 |
| Main circuit 1-minute power frequency withstand voltage (Same,relative/between fracture surfaces) (peak value) | kV | 70 | 80 |
| 1-minute power frequency withstand voltage of auxiliary circuit | kV | ||
| Rated current | A | 630 | |
| Transfer current | A | 870 | |
| 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 does a load break switch do?
A SF6 load break switch is a medium-voltage device used to safely switch electrical circuits on or off under normal load conditions. It can make, carry, and interrupt load current in power distribution systems. Load break switches are commonly used in substations, ring main units (RMU), and industrial power networks.
How does an SF6 load break switch work?
An SF6 load break switch uses sulfur hexafluoride gas for insulation and arc extinguishing. When the contacts open, an arc forms between them. The SF6 gas quickly cools and extinguishes the arc, allowing the current to be safely interrupted in medium-voltage distribution systems.
What is the FLN36 load break switch used for?
The FLN36 SF6 load break switch is used in medium-voltage switchgear to control and isolate power distribution circuits. It is commonly installed in ring main units, substations, and industrial electrical systems to switch load currents and provide reliable power network operation.
What is the difference between a load break switch and a circuit breaker?
A load break switch interrupts normal load current, while a circuit breaker can interrupt both load current and fault current. Circuit breakers provide full protection against short circuits, whereas load break switches are mainly used for switching and isolation in distribution networks.
Why use a load break switch?
Load break switches are used because they allow safe switching under load conditions. They are compact, reliable, and require low maintenance. These switches are widely used in medium-voltage power distribution systems such as substations, ring main units, and industrial facilities.
What is the lifespan of a load break switch?
A typical medium-voltage load break switch has a mechanical life of more than 3000 operating cycles. With proper installation and maintenance, the equipment can operate reliably for many years in power distribution systems.
Why is SF6 used in load break switches?
SF6 gas is used because it has excellent insulation and arc-extinguishing properties. It allows compact switchgear design and provides stable performance in medium-voltage electrical equipment.
Is SF6 banned in Europe?
SF6 is not completely banned in Europe, but its use is increasingly regulated because it is a greenhouse gas. Many manufacturers are developing alternative technologies such as vacuum or clean-air switchgear.
Related Applications
Ultra-High Voltage Power Distribution
The FLN36 load break switch plays a critical role in the backbone of ultra-high voltage distribution networks. It enables safe switching, sectionalizing, and isolation of medium-voltage feeders, ensuring stable power flow across large-scale grid infrastructure. Its compact design and reliable SF6 insulation make it ideal for modern substations and advanced distribution systems.
Power Distribution for Integrated Energy Bases
In large integrated energy bases that combine renewable energy, storage, and conventional power generation, the FLN36 load break switch provides dependable medium-voltage switching and network protection. It supports efficient power routing between energy sources, substations, and distribution networks, helping maintain stable and continuous energy delivery.
Long-Distance High-Voltage Distribution
For high-capacity and long-distance power transmission and distribution projects, the FLN36 load break switch ensures reliable switching and operational safety. It helps manage power flow across extended distribution lines, reduces operational risks, and improves the stability of medium-voltage networks in demanding industrial and utility applications.
