High-voltage ring main units (HV RMUs) are commonly seen on streets, marked with "High Voltage – Danger", but most people do not know their exact name. With the development of the cable-based transformation of power distribution networks, HV RMUs can be used for multi-branch cable connections when small-capacity independent loads are relatively concentrated. Since individual branches cannot be directly operated, they are only used as cable branching devices.

The selection of HV RMUs is quite important. Air-insulated HV RMUs with heat-shrinkable materials as the main component are older products and have been phased out. Protective HV RMUs with rubber sleeves as the main material are prone to terminal cracking during long-term use, thus restricting their development. There are various types of HV RMUs available, including European-style HV RMUs, American-style HV RMUs, and HV RMUs with switches, among others. The 10 kV HV RMU is the most common type. With the modernization of the power industry, HV RMUs play an increasingly significant role.

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