General
Application
Environmental
Standards
MV cubicle-type air-insulated switchgear (C-AIS) is a metal-enclosed, compartmentalized assembly for medium-voltage power distribution, using air as the primary insulation medium. It typically integrates a withdrawable vacuum circuit breaker, segregated busbar and cable chambers, and a low-voltage control compartment for protection, metering, and communications. Mechanical and electrical interlocks, shutters, and earthing provisions support safe operation and maintenance. Optional arc pressure relief and standardized interfaces simplify testing, retrofits, and lifecycle service.
MV Cubicle-type Air Insulated Switchgear (C-AIS) is widely applied in utility substations, industrial plants, renewable power collection, commercial campuses, and critical facilities such as data centers. It supports feeder, transformer, motor, and capacitor-bank switching with reliable protection, metering, and interlocking. Typical duties include sectionalizing ring main networks, integrating distributed generation, and coordinating with SCADA for remote operation. Flexible metering and communications integration helps operators optimize loading, improve power-quality management, and enhance operational safety.
Application:indoor installation.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (at 25°C); ambient air RH <93%.
Altitude: ≤1000m above sea level.
Max wind speed: ≤35 m/s.
Seismic withstand: Horizontal ≤0.3 g; Vertical ≤0.15 g.
Special conditions: Custom-built solutions available fo·r project-specific requirements.
Ambient temperature: -50°C to +40°C
Relative humidity: ≤90% (at 25°C); ambient air RH <93%.
Altitude: ≤1000m above sea level.
Max wind speed: ≤35 m/s.
Seismic withstand: Horizontal ≤0.3 g; Vertical ≤0.15 g.
Special conditions: Custom-built solutions available fo·r project-specific requirements.
IEC 62271-200 — AC metal-enclosed switchgear and controlgear (1 kV–52 kV)
IEC 62271-1 — Common specifications
IEC 62271-100 — Alternating current circuit-breakers
IEC 62271-102 — Disconnectors and earthing switches
IEC 62271-103 — Alternating current switches / switch-disconnectors
IEC 62271-105 — Alternating current switch-fuse combinations
IEC 62271-1 — Common specifications
IEC 62271-100 — Alternating current circuit-breakers
IEC 62271-102 — Disconnectors and earthing switches
IEC 62271-103 — Alternating current switches / switch-disconnectors
IEC 62271-105 — Alternating current switch-fuse combinations
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Why Choose Kerun Intelec
Choose us for precision-engineered transformers—superior efficiency, global certifications, 24/7 support, and tailored solutions. Trusted durability, energy-saving innovation, ensuring optimal performance and longevity worldwide.
Fast Lead Times
Our made-to-order production timelines are highly competitive and as low as 8 weeks from order to delivery.
Design Conformance
We maintain rigorous oversight to ensure every transformer adheres precisely to your exact specifications.
Comprehensive Warranty
We stand behind the longevity and reliability of our products with a robust warranty that covers both materials and workmanship.
Competitive Pricing
We deliver exceptional value so you receive top-tier, reliable, high-quality products without the premium price tag
Exceptional Quality
We implement strict quality control measures at every stage of production to ensure our products meet or exceed industry standards.
Dedicated Support
Our support team is always at your service.Offering expert guidance from initial inquiry through post-installation support.
Switchgear (C-AIS) Features
Cubicle-type Gas Insulated Switchgear delivers compact, sealed insulation stability, enabling high functional density, improved operational safety, and predictable maintenance performance for demanding indoor switchrooms.
Flexible Design - Well-matched To A Range Of Applications.
Modular C-AIS panels accept withdrawable vacuum circuit breakers, contactors, metering, and bus-section options, with configurable low-voltage compartments and plug-in wiring to match different single-line schemes and protection philosophies.
Space Saving – Effective, Flexible Layout
Compact metal-enclosed construction with an optimized compartment layout and flexible cable entry reduces switchgear room footprint and clearance requirements, while maintaining front-access operation and service paths for safe handling.
Laborsaving – Reduction of Manpower
Withdrawable devices, clear position indication, shutters, and logical mechanical interlocks streamline racking, isolation, and testing steps, cutting switching time and reducing the manpower needed for routine operations and outages.
Energy Saving – Reduced Operating Costs
Low-resistance copper busbars and stable vacuum interruption limit temperature rise and associated I²R losses; the smaller room volume also reduces ventilation and air-conditioning demand, lowering ongoing operating costs.
High Reliability – Long-term, Trouble-free Operation
Type-tested metal-enclosed assemblies with proven vacuum switching elements and controlled access to cable and breaker compartments support predictable performance, high availability, and repeatable protection coordination over long service intervals.
Safe Design – Ensures Operator’s Safety
Metal partitions, interlock-controlled access, closed shutters over live contacts, and internal-arc pressure relief paths help contain arc energy and direct gases away from the operator, improving safety during abnormal conditions.
Minimal Maintenance – Reduced Maintenance Costs
Maintenance-free vacuum interrupters, no insulating-gas handling or pressure monitoring, and plug-in secondary connections minimize periodic servicing and shorten planned shutdowns, reducing lifecycle maintenance effort and cost.
High Voltage Compartment
Engineered for reliable insulation and arc-containment performance, the high-voltage compartment supports safe switching, clear access for maintenance, and stable operation in demanding medium-voltage networks.
Circuit Breaker Compartment
Circuit breaker compartment in Medium Voltage Cubicle-type Air Insulated Switchgear houses a withdrawable circuit breaker on racking rails, with primary disconnects, shutters, and mechanical interlocks. Segregated metal barriers and arc pressure relief guide fault gases safely, enabling rapid maintenance, status indication, and dependable protection coordination.
Main Components
Vacuum Circuit Breaker (Withdrawable)
Shutter Mechanism
Contact System
Truck Chassis & Rails
Busbar Compartment
Segregated busbar compartment ensures stable current distribution and reduced thermal hotspots, enhancing reliability under continuous load, improving short-circuit withstand performance.
Busbar Compartment
The busbar compartment in Medium Voltage Cubicle-type Air Insulated Switchgear encloses the main copper busbars in a segregated, metal-partitioned space with insulated supports and controlled clearances.his design ensures reliable phase segregation and superior insulation, protecting the power integrity of the entire system.
Main Components
Main Components
Branch Busbars
Insulating Supports
Cable Compartment
Dedicated cable compartment provides generous bending space and clear separation, reducing installation errors, easing heat dissipation, and supporting safe inspection, testing, and rapid feeder modifications.
Cable Compartment
The cable compartment in Medium Voltage Cubicle-type Air Insulated Switchgear provides dedicated space for power cable terminations, stress-control accessories, and current transformers, with a continuous earthing bar and optional earthing switch. Flexible bottom entry, secure cleating, and clear routing simplify installation, testing, and maintenance.
Main Components
Cable Terminations
Earthing Switch
CT / PT
Surge Arrester
Low-Voltage Compartment (Secondary)
Isolated LV compartment houses secondary circuits away from primary conductors, enhancing safety, reducing electromagnetic interference, and simplifying configuration, testing of medium-voltage cubicles.
Low-Voltage Compartment
The Low-Voltage Compartment in MV Cubicle-type Air Insulated Switchgear centrally houses all protection, control, and monitoring devices. Electrically isolated from high-voltage sections, it ensures secure operation of relays, meters, and communication modules.
Main Components
Protection Relay / IED
Terminal Blocks
Meters, Indicator Lamps000
Communication Module
Critical Auxiliary Systems
Coordinated auxiliary systems safeguard internal conditions and operating sequences, enhancing safety margins, supporting accurate status monitoring, and helping maintain reliable, continuous service for medium-voltage distribution networks.
Critical Auxiliary Systems
Critical auxiliary systems in Medium Voltage Cubicle-type Air Insulated Switchgear include anti-condensation heaters, ventilation, temperature or humidity monitoring, door switches, interlocks, trip circuits, and trip/close power supply supervision, stabilizing insulation, protecting secondary electronics, and ensuring dependable operation under standby or cycling loads.
Main Components
Pressure Relief Ducts/Vents
Mechanical Interlocking System
Air Insulated Switchgear Design Drawings
Design drawings clearly present switchgear arrangement, panel dimensions, compartment layout, busbar position, cable entry direction, grounding system, and installation clearance for accurate project planning.
MV- Switchgear-C-AIS-Drawings
MV- Switchgear-C-AIS-Drawings
MV- Switchgear-C-AIS-Drawings
Air Insulated Switchgear Accessories Include
Vacuum Circuit Breaker (VCB)
Load Break Switch (LBS)
Disconnector / Isolating Switch
Earthing Switch
Fuse Switch / Fuse Holder
Current Transformer
Voltage Transformer
Multifunction Power Meter
Ammeter
Voltmeter
Energy Meter
Protection Relay
Microprocessor Protection Unit
Control Switch
Auxiliary Relay
Trip Coil
Closing Coil
Shunt Release
Undervoltage Release
Live Line Indicator
Position Indicator
Fault Indicator
Temperature and Humidity Controller
Mechanical Interlock
Electromagnetic Lock
Door Limit Switch
Copper Busbar
Cable Terminal / Cable Lug
Air Insulated Switchgear About Testing
Each C-AIS cubicle-type air insulated switchgear is tested to verify electrical insulation, mechanical operation, protection function, interlocking reliability, and safe operation before delivery.
Routine Tests
Type Tests
Special Tests
Visual & mechanical inspection
Main circuit resistance check
Dielectric withstand (power-frequency)
Control/auxiliary circuit functional tests
Insulation resistance measurement
Mechanical operating test (interlocks, movement)
Temperature-rise (thermal) test
Dielectric tests (incl. impulse where applicable)
Short-circuit withstand & peak current test
Internal arc fault classification/verifications
Mechanical endurance (operations)
Environmental/degree of protection (IP) test
Partial discharge measurement
EMC/EMI tests
Low/high temperature & humidity tests
Seismic qualification
Salt-fog/corrosion exposure test
Wet power-frequency withstand (outdoor AIS)
·All Switchgear undergo strict testing based on the latest IEEE and IEC standards, with detailed reports ensuring traceability. This guarantees each unit meets the highest standards of quality, safety, and performance.
Package & Delivery
Engineered packaging and controlled logistics protect transformers from damage, simplifying site handling, offloading, installation and commissioning project schedules.
Wooden / Steel Skid with Sealing Film
For nearby deliveries, we recommend skid plus sealing film when you need economical protection, forklift handling and quick onsite positioning.
Wooden / Steel Frame
We suggest wooden or steel framing when you require protection for protruding parts, highway transport, repeated loading and open-deck shipping.
Wooden Crate
Preferred for export and long routes; closed crates protect from weather, dirt and impact, allow stacking and minimise accessory loss.
Container Shipment
Ideal for high-value or overseas projects; containers improve weather protection, security and standardised lashing, simplifying sea–rail–road multimodal logistics.
Transportation & Delivery
We propose skid, frame, crate or container options based on route, handling and budget, ensuring safe, efficient transformer delivery.
Review key FAQ before purchasing (C-AIS) Cubicle-type Air Insulated Switchgear, covering lead time, grid standard customization, materials, certified components, factory testing, installation support, and long-term reliable operation.
What Is The Lead Time For C-AIS Cubicle-type Air Insulated Switchgear?
The typical lead time is 4 to 10 weeks, depending on rated voltage, rated current, short-circuit level, panel quantity, protection relay configuration, busbar design, enclosure material, component brands, drawing approval, factory testing, and transportation requirements.
Can The Switchgear Be Customized For Different Grid Standards?
The switchgear can be customized according to IEC, GB, EN, IEEE or local utility standards, including voltage level, frequency, protection scheme, interlock logic, cable entry direction, control voltage, metering requirements, labeling, and documentation for different grid projects.
What Customization Options Are Available?
Customization options include copper or aluminum busbars, galvanized or stainless-steel enclosure, powder-coated panels, IP rating, feeder arrangement, protection relays, CTs, VTs, circuit breakers, meters, surge arresters, heaters, lighting, mechanical interlocks, and communication interfaces based on project requirements.
What Tests Will Be Performed Before Delivery?
Each switchgear panel can be tested with visual inspection, mechanical operation test, wiring check, power-frequency withstand voltage test, insulation resistance test, control circuit test, interlock function test, relay verification, contact resistance test, and final factory acceptance inspection before shipment.
Do You Support Installation And Commissioning?
Installation support is available through technical drawings, wiring diagrams, foundation guidance, installation manuals, remote technical support, and on-site commissioning assistance when required. This helps ensure correct assembly, safe energization, and stable operation after delivery.
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Kerun Intelec
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