Ring Main Unit substations are integrated units in electrical distribution systems modernized and enhanced for reliable and efficient power distribution. They incorporate connect and disconnect functions for multiple circuits for safe and manageable power distribution systems. Designed by Zhejiang Greenpower Ring Main Unit substations offer sustained seamless operation in a variety of conditions with the most advanced and modern features. Our customers have confidence in us as a valued electrical infrastructure partner for our sustained commitment to quality and willingness to offer modified designs.