SH Power possesses a well-established R&D and engineering team capable of tailoring exclusive solutions for various project requirements. From system design to on-site application, we provide comprehensive technical support, helping customers achieve safe, intelligent, and highly efficient power distribution systems.
SH-40.5 gas-insulated ring-main unit (RMU) is designed for power transmission and distribution in new-energy generation parks, compact secondary substations, commercial buildings, rail-transit systems, underground substations and remote-area substations—especially where installation space is extremely limited.
Built on the concepts of high performance and miniaturization, the unit employs full SF₆ gas insulation, so its operation is completely independent of ambient conditions such as high altitude, salt mist, condensation, dust or humidity. The result is a truly maintenance-free, highly reliable solution that meets the requirements of every kind of power user.
| Item | Load switch panel | Load switch-fuse combination panel | Three-position switch-vacuum circuit breaker panel | |
| Rated voltage | 40.5 | 4.05 | 40.5 | |
| Rated frequency | 50 | 50 | 50 | |
| Rated current | 630 | 43 | 630 | |
| Rated power-frequency withstand voltage | phase-to-phase and phase-to-earth | 95 | 95 | 95 |
| Across open contacts | 118 | 118 | 118 | |
| Rated lightning-impulse voltage | phase-to-phase and phase-to-earth | 200 | 200 | 200 |
| Across open contacts | 200 | 220 | 220 | |
| Rated short-circuit breaking current | – | 31.5 | 25 | |
| Rated short-circuit making current | 50 | – | 63 | |
| Rated short-circuit duration | 3 | – | 4 | |
| Rated short-time withstand current | 20 | – | 25 | |
| Rated peak withstand current | 50 | – | 63 | |
| Rated cable-charging breaking current | 50 | – | 50 | |
| Rated closed-loop breaking current | 630 | – | – | |
| Rated active-load breaking current | 630 | 630 | / | |
| Mechanical endurance | Load switch / earthing switch | 5000/3000 | 5000/3000 | / |
| Vacuum circuit-breaker / three-position switch | / | / | 10000/3000 | |
| Degree of protection | Low-voltage compartment | IP4X | IP4X | IP4X |
| Gas tank | IP65 | IP65 | IP65 | |
| Fuse compartment | IP65 | IP65 | IP65 | |
| SF₆ gas rated pressure | 0.02(rel.) | 0.02(rel.) | 0.02(rel.) | |
| SF₆ gas leakage rate | ≤0.1% | ≤0.1% | ≤0.1% | |
Our switchgear, including C-GIS and ring main units, features a compact and modular design, saving valuable installation space and allowing for flexible expansion and easy on-site assembly.
With all high-voltage components sealed in a stainless-steel gas tank, our equipment is protected from environmental factors. It features reliable mechanical and electrical interlocks to ensure the safety of operators.
Committed to sustainability, we offer eco-friendly switchgear that uses dry air as the insulating medium, completely eliminating SF₆ gas and minimizing environmental impact.
The fully sealed and insulated design ensures our switchgear is virtually maintenance-free throughout its service life, significantly reducing operational costs and downtime.
Our products can be integrated with intelligent solutions, supporting remote monitoring, control, and automated distribution systems, which is crucial for building modern smart grids.
Ideal for secondary distribution substations, industrial parks, commercial buildings, and residential communities, providing reliable power control and protection.
Perfectly suited for renewable energy applications such as wind farms and solar power plants, where compact and reliable switchgear is essential for power collection and grid connection.
Deployed in critical infrastructure like subways, railways, airports, and tunnels, where space is limited and high reliability is non-negotiable.
Used in demanding environments such as mining, petrochemical plants, and data centers that require robust, safe, and uninterrupted power management.
