Product Overview

The HES Series Ring Main Unit (RMU) adopts a fully enclosed, gas-insulated design, with all live parts sealed inside a stainless-steel gas tank. This structure effectively isolates internal components from environmental influences, ensuring high reliability, enhanced safety, and maintenance-free operation.

The RMU supports top and side expansion and features a modular functional unit design, allowing flexible configuration to meet various project requirements. It can also be equipped with automation and intelligent monitoring solutions, delivering smart operation and value-added lifecycle services.

Compliance Standards

IEC 62271-100 Alternating-Current Circuit-Breakers

IEC 62271-102 Alternating-Current Disconnectors and Earthing Switches

IEC 62271-103 Switches for Rated Voltages above 1 kV and up to and including 52 kV

IEC 62271-200 A.C. Metal-Enclosed Switchgear and Controlgear for Rated Voltages above 1 kV and up to and including 52 kV

IEC 60529 Degrees of Protection Provided by Enclosures (IP Code)

IEC 62271-1 High-Voltage Switchgear and Controlgear - Part 1: Common Specifications

Product Highlights

Proven Global PerformanceOver 20 years of experience, with installations in 65+ countries.

01
Standards ComplianceFully compliant with IEC, ANSI, and IEEE standards.

02
Strong Renewable Track RecordTotal installed capacity in renewables exceeds 70 GW.

03
Enhanced Safety DesignViewing windows enable visual verification of contact position, meeting IEEE requirements.

04
Intelligent O&MSmart components support condition monitoring and efficient operation.

05
High Manufacturing CapacityAnnual output exceeds 20,000 RMU units.

06

Product Structure

Case scenarios

Technical Specifications

Item	Unit	Vacuum CB Panel	Load Switch Panel
Rated Voltage	kV	38
Rated Frequency	Hz	50 / 60
Rated Power-Frequency Withstand Voltage (1min)	kV	80 / 90
Rated Lightning Impulse Withstand Voltage	kV	185 / 215
Rated Continuous Current	A	630
Rated Short-Time Withstand Current (3s)	kA	20 / 25
Rated Peak Withstand Current	kA	52 / 65
Internal Arc Classification (IAC)	kA/s	20/1, 25/1
Leakage Rates	V / V (% / year)	≤ 0.01%
Filling Level for Insulation and/or Switching Minimum Functional Gas Level for Insulation and/or Switching	MPa (rel.)	0.04 0.03
Degree of Protection for Gas Tank	IP Code	IP67
Degree of Protection for Switchgear Enclosure (Indoor/Outdoor)	IP Code	IP4X / IP54
Rated Short-Circuit Breaking Current	kA	20 / 25	/
Mechanical Endurance	Times	10000	5000
Electrical Endurance	Grade	E2	E2
Dimension of Indoor Product in Inches (mm)	Width	19.7 (500)	17.7 (450)
	Depth	38.2 (970)	38.2 (970)
	Height	86.6 (2200)	86.6 (2200)