Top Ring Main Unit Manufacturers in China Offer High Quality Medium Voltage Switchgear for Global Markets

RAYDAFON Dis Sub-12 SF6 Gas-Insulated RMU delivers 12kV distribution switching with SF6 gas sealed in a stainless steel tank at 0.04 MPa — annual leakage ≤0.01%, IP67-rated. Load switch, vacuum circuit breaker, and electrified busbar are all encapsulated for 30-year maintenance-free operation. Supports up to 5 modules per tank with busbar extension. Suitable for 12kV ring network or terminal power supply systems in flood-prone, coastal, and contaminated environments.

RAYDAFON Dis Sub-12 Compact Air-Insulated RMU delivers 12kV distribution in a 500mm-wide cabinet — the most compact fixed air-insulated switchgear for box substations and ring networks. Uses air insulation with no gas filling and no harmful emissions. Integrated three-station isolating switch + fixed vacuum circuit breaker, pressure relief channels on top and rear, and modular C/F/V/PT/M/D configurations. Rated 1250A, 31.5kA/4s withstand, IP4X enclosure.

RAYDAFON Dis Sub-12 SF6-Free Gas-Insulated RMU delivers 12kV distribution switching with zero SF6 emissions — using dry air and eco-friendly mixed gas sealed in an IP67 stainless steel tank. Rated 630A (1250A optional) with 20kA short-circuit withstand. Modular design supports up to 5 modules per tank with busbar extension. Vacuum interrupter and three-station isolating switch ensure safe, maintenance-free operation for 30 years. Ideal for utility distribution networks, industrial parks, and renewable substations.