There is a SF6 Ring Main Unit offered by us that is used to ensure the power supply that when the main source of power shutdown, the second source could be feed immediately. It is one of the safest types of ring main unit in the market. RMU (Ring Main Unit) cabinet or medium voltage cabinet is integrated electrical equipment to connect, measure, and integrate fixed type breaker with transformer protection function. They are small in size, highly reliable, safe, easy to maintain, easy to replace, and expand. The SF6 Ring Main Unit is made for use in the various industries.ï