Indoor High Voltage Gas-insulated Ring Main Unit (RMU)

1. Fully Sealed and insulated Design: All live parts of the SRM6-40.5 are encapsulated within a single box constructed from welded.
304 stainless steel plates. The box is filled with SF6 gas at a working pressure of 1.4 bar and boasts an IP67 protection rating. It is suitable for installation in areas with high humidity and substantial dust pollution, making it particularly well-suited for mines, box-
type substations, and any locations where air pollution might lead to surface flashovers. The product is fitted with bushings compliant with DIN47636 and connected to the cables via fully insulated, sealed, and shielded cable glands.
2. High Reliability and Personal Safety: All live parts are enclosed in an SF6 gas chamber, which features a reliable pressure relief mechanism and has successfully undergone an internal fault arc test at 25kA/0.5s. The load and ground switches are three-position.
switches, simplifying their interlocking mechanism. A robust mechanical interlock is provided between the cable chamber cover and the load switch, effectively preventing inadvertent access to live compartments.
for the main switch. The annual gas leakage rate is limited to 0.1%.
3. Maintenance-Free and Long Lifespan: The product is designed for a 30-year lifespan, during which no maintenance is required.
4. Compact Structure: Besides air-insulated metering and PT cabinets, the standard module width is 500mm. All units feature cable connection sleeves at the same height, simplifying on-site construction.
5. The SRM6-40.5 can be equipped with optional intelligent control devices, offering effective protection, remote control, and monitoring systems that support the automation of power distribution systems
6. SRM6-40.5 offers two protection strategies for transformers: the load switch-fuse combination and the relay-protected circuit applicable for transformer protection across various capacities.
breaker. Load switch-fuse combinations are suitable for transformers up to 16ookvA, whereas circuit breakers with relays are
7. Environmental Protection: The development of SRM6-40.5 focuses not only on the product itself but also on environmental sustainability throughout the production process and the switch's entire lifespan. All materials are chosen for their environmental compatibility and employ zero-leakage clean technology. The product is designed to be sealed for life, with 90%-95% of materials being recyclable at the end of its lifecycle.

Ambient temperature: -40 ℃-+40 ℃ (if below -30 ℃, to be negotiated between the user and the manufacturer); Altitude: s2500 m (if over 2500m, to be negotiated between the user and the manufacturer); Maximum average relative humidity: 24-hour average s 95%, monthly average s 90%
Seismic intensity: No more than eight degrees; A place free from fire, explosion, chemical corrosion and frequent violent vibration.

Notes: a (Cabinet width): 600mm, 800mm b (Cabinet depth): 12kV depth is 1420; 40.5kV depth is 16201. Small bus room
2. Instrument chamber
3. Main bus compartment
4. Station isolation switch
5. Operating mechanism room
6. Circuit breaker
7. Circuit breaker gas compartment
8. Cable chamber
9. Current transformer
10. Cables
11. CM-35 lightning arrester
12. Pressure relief channel
13. Cable socket14. Cable socket
15. Test socket plug
16. Test socket
17. Branch busbar
18. Pressure relief device
19. Main busbar
20. Bus connector socket
21. Bus connector