Ring Main Unit Manufacturer | 10kV SF6 Withdrawable Switchgear

HXGN-15 10kV SF6 Gas Insulated Withdrawable Ring Main Unit

What is a Ring Main Unit (RMU)?

A Ring Main Unit (RMU) is a compact, sealed, high-voltage switchgear used for medium-voltage power distribution in 10kV to 40.5kV systems. The HXGN-15 Gas Insulated RMU adopts SF6 gas insulation technology combined with air insulation, ensuring high safety, compact structure, low maintenance, and long service life.

This model integrates advanced three-station SF6 load switches with full interlocking protection and modular design, making it ideal for modern power distribution automation systems. Its withdrawable switchgear structure simplifies operation, enhances safety, and reduces downtime during maintenance.

Key Features & Advantages

Compact & Space-Saving Design – Optimized for urban power distribution with minimal installation footprint.
SF6 Gas Insulation – Provides excellent arc extinguishing performance and insulation reliability.
High Safety Standards – Built-in “Five-Proof” interlock system:
- Prevents switching the main circuit with load
- Prevents accidental access to live parts
- Prevents misoperation of grounding switch
- Prevents grounding when the system is live
- Prevents live earthing wire disconnection
High Reliability – Sealed design with excellent pressure resistance, ensuring stable performance even under harsh environmental conditions.
Withdrawable Switchgear – Simplifies maintenance, minimizes downtime, and improves operational flexibility.
Low Maintenance – SF6 insulation and sealed chamber minimize routine servicing.

Product Parameters

Project	Company	Load switch cabinet	Combination cabinet	Circuit breaker cabinet
Rated voltage	kV	12	12	12
Rated frequency	Hz	50/60	50/60	50/60
Rated current	A
Main busbar	A	630	630	630
Branch bus	A	630	125()	630

()		42	42	42
()		48	48	48
()		2	2	2
()		75	75	75
()		85	85	85
	kA	20/3	–	25/2
	kA	20/3	–	25/2
	kA	50	–	63
()	kA	50	80	63
	kA	–	31.5	25
		–	1700	–
		630	–	–
		630	–	630
		10	–	15
		IP3X	IP3X	IP3X

Applications

The HXGN-15 SF6 Gas Insulated Ring Main Unit is widely used in:

Urban power grids – residential communities, shopping malls, commercial complexes
Industrial facilities – factories, manufacturing plants, mining enterprises
Infrastructure projects – airports, railway systems, tunnels, bridges, stadiums
Renewable energy systems – wind farms, solar power stations
Healthcare & data centers – hospitals, laboratories, and IT facilities requiring high reliability

Why Choose HXGN-15 SF6 Ring Main Unit?

Compared with traditional oil-insulated switchgear or conventional air-insulated switchgear, the HXGN-15 offers:

Higher safety → SF6 gas insulation provides superior arc protection
Better reliability → Fully sealed and maintenance-free
Smaller footprint → Compact modular design saves space
Automation-ready → Easily integrates with smart grid and SCADA systems

Selection Guide

When selecting the right Ring Main Unit (RMU) for your application, consider the following:

Rated Voltage & Current – Ensure compatibility with your power distribution system (commonly 10kV/12kV).
Load Capacity – Choose the correct rated current based on system demand and future expansion.
Installation Environment – For humid, dusty, or confined spaces, SF6 gas-insulated RMUs provide better protection and longevity.
Automation Requirements – If remote monitoring and control are needed, select models compatible with SCADA integration.

FAQ

Q1: What is SF6 gas and why is it used in RMUs?
A: SF6 (sulfur hexafluoride) is a highly effective insulating and arc-extinguishing gas, providing excellent electrical insulation and safety in compact switchgear designs.

Q2: How long does an SF6 Gas Insulated RMU last?
A: The HXGN-15 RMU typically has a service life of 20–30 years with minimal maintenance, thanks to its sealed chamber and stable insulation properties.

Q3: Can the HXGN-15 RMU be integrated into smart grid systems?
A: Yes. The HXGN-15 supports automation upgrades and can be integrated with SCADA systems for remote monitoring, fault detection, and load management.