"Vacuum" Ring Main Unit: High-Reliability Power Distribution Equipment with Vacuum Arc Extinguishing Technology at Its Core

The so-called "vacuum insulated ring main unit" has its core technology in the switch unit (load switch or circuit breaker) using a vacuum interrupter to break current, while the phase-to-phase and phase-to-ground insulation of the entire cabinet is handled by other media. This combined technology achieves long life and high reliability for the switch unit, making it a typical feature of high-end ring main units.

"Vacuum Arc Extinguishing + Air Insulation" (Traditional Combination)

The switch uses a vacuum interrupter, but insulation for other live parts inside the cabinet relies on traditional air gaps and creepage distances.

Advantages: Relatively low cost, intuitive maintenance.

Disadvantages: Larger cabinet volume, susceptible to environmental factors (humidity, pollution), lower safety compared to fully insulated cabinets.

Outstanding Product Features

1.Extremely High Electrical Life and Breaking Reliability: The vacuum interrupter is sealed inside a vacuum bubble, unaffected by external environment, with minimal contact wear. It can withstand tens of thousands of load current interruptions and dozens of fault current interruptions, far superior to other arc extinguishing methods.

2.Extremely Low Maintenance: The vacuum interrupter is a fully sealed structure, requiring no overhaul or medium replacement throughout the equipment's lifecycle, truly achieving "maintenance-free" operation.

3.Safe and Environmentally Friendly: The breaking process occurs inside the sealed vacuum bubble, producing no high-temperature arc spray. Unlike SF₆ gas, it poses no greenhouse effect issues (especially when combined with environmentally friendly gas insulation), making it very safe for operators and the environment.

4.Wide Application Range: Particularly suitable for frequent operation scenarios with extremely high power supply reliability requirements, such as data centers, large commercial centers, industrial and mining enterprises, etc.

Practical Applications and Selection Tips

Overall insulation method selection:

Option 1: "Vacuum Arc Extinguishing + Environmentally Friendly Gas Insulation" – a top-tier fully insulated, fully sealed, maintenance-free product suitable for various harsh indoor and outdoor environments.

Option 2: "Vacuum Arc Extinguishing + Air Insulation" – still a semi-insulated device that must be installed in clean, dry indoor distribution rooms.