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Medium-Voltage Components
Powering safety and efficiency with our high-performance MV components. Engineered for the 7.2kV to 40.5kV range, our comprehensive portfolio—including Vacuum Circuit Breakers, SF6 Load Switches, and Isolation Trucks—forms the heart of Ring Main Units (RMU) and Switchgear.
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Medium-Voltage Components: The Core of Reliable & Intelligent Power Distribution
Medium-voltage components ensure safe, continuous, and controllable power transmission from substations to end users. Their advantages include high reliability and extreme safety, which reduces power outage time, ensures personnel safety, lowers maintenance costs, and extends equipment lifespan.
Medium-voltage components are key functional modules in medium-voltage switchgear such as RMUs and switchgear cabinets. They mainly include SF6 load switches, vacuum circuit breakers, PT trucks, and isolating trucks, realizing four core functions: switching, protection, detection, and isolation. Their rated voltage range is from 7.2kV to 40.5kV.
Handcart
SF6 Load Break Switch
CATALOGUE
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All the information related to our products at your disposal:
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Why Choose TOONICE’s Medium-Voltage Components?
Fast Fault Clearance
Disconnection <60ms, short circuit reduction 100%
Safe Operation
Visual isolation, accident reduction 90%
Maintenance without Power Disconnection
Quick Handcart Replacement, downtime reduced 70%
Status Visible
Precise PT Sampling, error ≤0.5%
Low Lifespan Cost
30,000 cycles lifespan, LCC reduced 25%
FAQs
Why is it called a “ring” main unit?
Because it’s used in a ring (loop) network, where power can flow from two directions. If one side fails, supply continues from the other side, better reliability.
What voltage levels do RMUs operate at?
Typically:
- 6 kV
- 11 kV
- 22 kV
- 33 kV
What is SF₆ in RMUs, and is it safe?
SF₆is a gas with excellent insulation properties
Safe when sealed, but it’s a greenhouse gas
Many manufacturers now offer SF₆-free RMUs due to environmental regulations
How often do RMUs require maintenance?
Gas-insulated RMUs: Very low (often 10–20 years)
Solid insulated RMUs: Minimal
Routine inspections still recommended per utility standards
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