At Mingri Electric Co., Ltd., our journey is anchored to a simple yet profound vision statement articulated by our founder, Mr. Fu: "To safeguard every circuit." This baseline commitment to absolute safety, operational reliability, and environmental compatibility drives us to redesign power distribution from the engineering level upwards.
We manufacture a broad range of medium voltage air-insulated switchgear (AIS), gas-insulated switchgear (GIS), solid insulated ring main units (RMU), and premium low-voltage control assemblies. Every circuit breaker, busbar, vacuum interrupter, and metal enclosure is subjected to exhaustive cycle testing, conforming with strict international engineering benchmarks.
Quality is not an afterthought; it is built into the metallurgy. We don't merely assemble switchgear; we customize its electrical and mechanical interfaces from raw materials.
We work closely with selected precision stamping partners to design custom tooling, forging robust contact points and structural parts. Because we manufacture our own line of low- and high-voltage vacuum circuit breakers (VCBs), we eliminate component mismatch. This guarantees that when a breaker is installed in our hermetically-sealed gas compartments, the physical alignment, mechanical clearance, and electrical insulation match up perfectly.
This level of quality control allows Mingri Electric to ensure that every Medium Voltage Gas Insulated Switchgear (GIS) meets high standards of electrical endurance and thermal performance, even under heavy duty cycle profiles.
As power distribution grids evolve to support renewable resources, smart controls, and localized microgrids, medium voltage gas-insulated switchgear (GIS) plays a critical role in system safety.
The industry is transitioning from standard SF6 gas to eco-friendlier alternatives. Innovations in fluoronitrile-based gas mixtures and technical clean air offer a low global warming potential (GWP) while maintaining excellent dielectric and arc-extinguishing performance.
By using thermal sensors, mechanical wear counters, and gas pressure monitors, operators can track switchgear health in real-time. This dynamic telemetry helps transition maintenance from fixed schedules to a predictive framework.
Hermetically sealed stainless steel gas tanks protect primary high-voltage components from humidity, dust, and corrosive vapors. The smaller footprint also simplifies installation in wind turbines, offshore platforms, and crowded urban hubs.
| Performance Specification Parameter | Standard Range (12-24kV GIS) | High Voltage Range (40.5kV GIS) | Design Advantage |
|---|---|---|---|
| Rated Dielectric Power Frequency Withstand | 28 kV / 42 kV / 50 kV | 95 kV | Robust insulation margin prevents internal dielectric breakdown |
| Lightning Impulse Withstand Voltage (BIL) | 75 kV / 95 kV / 125 kV | 185 kV | Protects downstream systems from severe atmospheric surges |
| Annual Leakage Rate of Sealed Tank | < 0.1% per annum | < 0.1% per annum | Welded stainless steel chamber ensures a long gas service life |
| Internal Arc Classification (IAC) | AFLR 25kA / 1s | AFLR 31.5kA / 1s | Vented channels protect personnel from blast hazards |
| Mechanical Endurance Class | M2 Class (10,000 cycles) | M2 Class (10,000 cycles) | Low-maintenance actuator and linkage system |
Withdrawable armored metal-enclosed switchgear engineered for indoor distribution. Ideal for power plant substations and primary commercial grids.
High-voltage/low-voltage prefabricated outdoor transformer substation designed for commercial centers, public utility grids, and residential energy hubs.
Fully insulated, gas-insulated ring main unit. Provides high ingress protection (IP67) for tight urban spaces and challenging outdoor environments.
Withdrawable low voltage switchgear panel optimized for high-capacity motor control centers and distribution loads in large industrial plants.
Designed for three-phase power systems up to 500V. Protects control circuitry, aux relays, and automation modules from dust and moisture ingress.
Different industries face unique distribution challenges. Mingri Electric designs customized switchgear systems tailored to specific environments.
Ensures continuous operation for shopping centers, high-rise office towers, and hospital facilities where power failures are not an option.
Heavy machinery, chemical plants, and automotive lines demand high reliability. Our designs handle frequent load switching and electrical stress.
Solar PV plants and wind farms require compact designs capable of handling varying generation inputs and challenging outdoor climates.
Supplying integrated compact ring main units and low-voltage switches to deliver reliable power distribution in high-density commercial developments.
Providing heavy-duty withdrawable vacuum breakers and protective switchgear units that stand up to dusty, high-vibration manufacturing sites.
Integrating step-up substations with eco-efficient switchgear systems to manage fluctuating power loads in utility-scale solar installations.
Heavy-duty, high-interrupting-capacity switchgear panels engineered to protect generator buses and step-up stations against severe fault currents.
Installing space-saving, low-maintenance switchgear systems inside residential building basements to ensure safe, quiet power routing.
Installing gas-insulated switchgear inside narrow wind turbine towers to withstand salt spray, humidity, and wide ambient temperature swings.
At Mingri Electric, we follow rigorous testing procedures to ensure that every medium voltage gas-insulated switchgear unit functions reliably for its entire service life.
We perform strict audits and checks on component parts suppliers to maintain consistent quality and design tolerances from the very start.
Each switchgear panel undergoes helium leak testing, partial discharge measurement, power-frequency withstand testing, and mechanical loop tests before dispatch.
Our switchgear is designed and certified according to GB and IEC standards (including IEC 62271-1, IEC 62271-100, and IEC 62271-200).
Our switchgear products and production lines are fully certified, ensuring compliance with global electrical safety standards.
Metal-Enclosed Switchgear Standard
Quality Management Systems
Evaluating OEM vendors requires assessing engineering capacity, lead times, and post-sale technical support.
Look for robotically laser-welded stainless steel gas tanks. Precise, uniform welds prevent gas leakage and maintain enclosure pressure, which is critical for long-term dielectric performance.
Verify that the OEM offers step-by-step remote installation support, video inspections, and compatible upgrade options for existing low-voltage bays.
Ensure the switchgear's gas tanks are rated IP67 or better. Sealed primary circuits protect components from dust, humidity, salt spray, and insect infestation.
Through a reliable distribution network, our medium-voltage switchgear and protective breakers supply power to networks in Europe, Southeast Asia, South America, and the Middle East.
"Voltage is the starting point. Value is the destination. We are the catalyst in between."
Answering the common engineering, maintenance, and compliance questions about Gas Insulated Switchgear (GIS).
Connect with our technical support team to receive CAD drawings, complete electrical data sheets, and custom pricing estimates tailored to your project requirements.
Mingri Electric
