The RLS Series High-Performance Indoor SF6 Load Break Switch is a compact, three-position medium-voltage switching device engineered for 12kV and 24kV power distribution networks. This unit utilizes SF6 gas as both the primary insulating and arc-extinguishing medium.
Encased in a robust epoxy resin tank, the switch integrates Closing (On), Opening (Off), and Earthing (Ground) functions into a single sealed module. This design ensures superior dielectric strength, rapid arc suppression, and "maintenance-free" operation throughout its service life. It is the ideal core component for Ring Main Units (RMUs), cable branch boxes, and prefabricated substations.
Product Showcase Video
Two Configurable Models
RLS Standard Type: Pure SF6 load switch designed for loop switching, sectionalizing, and circuit isolation.
RLS Fuse-Combination Type: Integrated with high-voltage current-limiting fuses to provide comprehensive overload and short-circuit protection for distribution transformers
Key Technical Advantages
Premium SF₆ Insulation & Arc Extinguishing：The hermetically sealed gas chamber provides outstanding dielectric performance and fast arc quenching. This significantly reduces contact erosion, ensuring the switch meets the rigorous mechanical and electrical endurance tests defined in IEC 62271-103.
Integrated 3-Position Mechanical Interlock：Safety is paramount. The unit features a built-in mechanical interlock preventing operation between the Closing, Opening, and Earthing positions unless the sequence is correct. This eliminates misoperation risks and ensures operator safety during maintenance.
Compact Monoblock Epoxy Housing：“The lightweight, integrated epoxy structure saves valuable cabinet space. It is fully compatible with standard international RMU dimensions, allowing for easy retrofitting or new installation without extra cabinet modification.
Robust Environmental Adaptability：The fully sealed gas chamber eliminates the need for frequent gas refilling. The epoxy shell resists moisture, dust, and mild corrosive atmospheres, ensuring stable operation at altitudes up to 2500m and in varying humidity conditions.
Technical data
Rated voltage kV
12
24
Rated frequency Hz
50/60
50/60
Rated normal current A
630/800
630/800
1min power frequency withstand voltage (Dry/Wet) kV
42/48
65/79
Lightning impulse withstand voltage kV
75/85
125/145
Rated peak short-circuit breaking current kA
80
63
Rated active load & close-loop breaking current A
630/800
630/800
Rated transfer current A
1700
1200
Rated peak short-circuit making current kA
80
63
Cable charge breaking current under earthing fault A
20
20
Rated peak withstand current kA
80
63
2s short-time withstand current kA
31.5
25
Total mechanical operation life times
5000
2000
Typical Application Scenarios
Ring Main Units (RMUs): Core switching component for urban underground ring power distribution networks.
Cable Branch Cabinets: Reliable power distribution switching for residential communities and industrial parks.
Compact Medium Voltage Substations: Mini secondary substation load control & isolation.
Transformer Protection: RLS Fuse-Combination version dedicated for distribution transformer fault protection (overload & short-circuit).
Industrial Power Rooms: Medium voltage load switching for factories and data center power supply systems.
Matching dimension of SF6 load break switch-fuse combination Fig 1) SF6 load break switch without upper cubicle
Compact & Efficient, Flexible Deployment: Modular Load Break Switch Solution Breaks Substation Space BottlenecksFacing increasing urban power demands and limited construction space, traditional substations are encountering severe space bottlenecks: difficulties in siting new sites, constrained space for retrofit projects, and challenges in equipment capacity expansion and functional upgrades. Particularly in urban center renovations, old station upgrades, and packaged substation applications
Life Cycle-Optimized Solution: The Value Proposition of Load Break Switches for Reducing CAPEX and OPEXCore Proposition: By significantly lowering initial capital expenditure (CAPEX) and subsequent operating and maintenance expenses (OPEX), our Load Break Switch solution delivers the highest Return on Investment (ROI) throughout the equipment’s lifecycle. It stands as your ultimate choice for superior economics and efficient operational experience.Ⅰ. Initial Cost Optimization: Lower Investment T
Main Categories: Medium and High Voltage Switchgear/Power and Distribution Transformers/Instrument Transformers and Sensors/Lightning Protection and Electrical Insulation/Substations and E-Houses/Electrical Panel and Controlgear
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