HXGN Metal-enclosed Ring Main Unit (RMU)
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HXGN Metal-enclosed Ring Main Unit (RMU)

The HXGN-12 type box-type fixed metal-enclosed switchgear (referred to as ring main unit) is suitable for AC 50Hz power distribution systems with a rated voltage of 12kV. It is mainly used for breaking load current, short-circuit current, and closing short-circuit current. The load switch can be equipped with electric, manual, and spring operating mechanisms, while the grounding switch and disconnecting switch adopt manual operating mechanisms, ensuring stable operation and convenient operation.

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Technical parameter name Numerical values
Rated voltage 12kV
Rated current 630
Main bus rated current 630A
Branch circuit rated current 125A
Rated short-time withstand current 20kA
Rated short-circuit duration 4s
Rated peak withstand current 50kA
Rated active load breaking current 630A
Closed-loop interrupting current 630A
Grounding switch rated short-time withstand current 20kA
Grounding switch rated short circuit duration 4(2)s
Grounding switch rated peak withstand current 50kA
Grounding switch rated short-circuit making current 50kA
1-minute power frequency withstand voltage (phase-to-phase, phase-to-ground, vacuum load switch break) 42kV
1-minute power frequency withstand voltage (isolating switch contact) 48kV
Rated lightning impulse withstand voltage (phase-to-phase, phase-to-ground, vacuum load switch contacts) 75kV
Rated lightning impulse withstand voltage (disconnector break) 85kV
Mechanical life of vacuum load switch 10,000 times
Mechanical lifespan of grounding switches and disconnecting switches 20,000 times
AC current 3150A
Jiangsu Hengyuan Transformer Co., Ltd. is dedicated to providing safe, efficient, and reliable power equipment solutions for power systems, industrial sectors, and infrastructure construction.
We are a professional enterprise specializing in the research, development, and manufacturing of power equipment. Our main products include oil-immersed power transformers, dry-type transformers, combined transformers, high/low-voltage prefabricated substations, switchgear, cable branch boxes, power distribution boxes, and complete electrical equipment systems.
With strong technical capabilities and strict quality management, Hengyuan is committed to delivering stable and high-performance power solutions to customers worldwide.
About
Jiangsu Hengyuan Transformer Co., Ltd.
Jiangsu Hengyuan Transformer Co., Ltd. is dedicated to providing safe, efficient, and reliable power equipment solutions for power systems, industrial sectors, and infrastructure projects.
We specialize in the R&D and manufacturing of power equipment, with main products including oil-immersed power transformers, dry-type transformers, combined transformers, high/low-voltage prefabricated substations, switchgear, cable branch boxes, power distribution boxes, and complete electrical equipment systems.
The company is among the first group of recommended manufacturers for urban and rural power grid construction and upgrading by the National Economic and Trade Commission of China.
Over the years, our products have been widely used in power systems across Jiangsu, Anhui, Shanghai, Jiangxi, Fujian, Zhejiang, Guangxi, Hebei, and other regions in China.
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