HCM-12 Gas Insulated Metal Enclosed Ring Main Unit

The HCM-12 SF6 Ring Main Unit (RMU) is a compact, fully sealed, and highly reliable solution designed for medium-voltage power distribution systems ranging from 3.6kV to 12kV. Engineered for both ring and radial networks, this switchgear provides excellent safety, durability, and minimal maintenance, making it ideal for demanding applications and space-constrained environments.

All high-voltage components—including the load break switch, vacuum circuit breaker, earthing switch, and main busbar—are fully sealed within an epoxy resin enclosure, ensuring exceptional protection against moisture, dust, corrosive agents, and mechanical damage. The elbow-type cable connectors simplify the termination of incoming and outgoing cables, offering secure and user-friendly cable access.

Thanks to its robust construction and modular architecture, the HCM-12 RMU excels in harsh service conditions such as underground substations, prefabricated substations, industrial facilities, mining operations, and coastal or high-humidity environments.

Key Features

✅ Fully Sealed & Insulated Construction

• All live parts are hermetically sealed inside an epoxy resin tank, ensuring IP67-level protection against dust, water, chemicals, and corrosive gases.

• Ideal for deployment in environments such as salt-laden air, mining dust, flooding risk, or heavy industrial contamination, without any need for additional housing or barriers.

✅ Modular & Space-Saving Design

• The unit features a compact, modular structure that enables flexible configuration of various functions (switch, breaker, metering).

• Reduces floor space requirements, simplifying integration into RMUs, kiosks, and compact substations.

✅ Maintenance-Free Operation

• Designed for long-term reliability, the sealed tank eliminates routine maintenance on high-voltage components.

• No risk of SF6 leakage under normal operating conditions, ensuring environmentally responsible operation.

✅ Scalable & Easy to Expand

• Supports plug-and-play expansion for future load growth or changing grid requirements.

• Easily configurable for ring, radial, or dual-feeder systems.

✅ Optimized for Prefabricated Substations & Cable Branch Boxes

• Its compact footprint and robust design make it the preferred choice for urban power grids, residential developments, and industrial zones where space and reliability are critical.

Applications

• Urban power distribution networks

• Underground and prefabricated substations

• Mining and heavy industrial facilities

• Coastal or high-humidity zones

• Smart grid and automation-ready projects

For more details or custom configurations, feel free to contact our engineering team.

Main parameter