Medium Voltage Switchgear & Distribution Panels
When it comes to primary power distribution, absolute reliability and operator safety are non-negotiable. Our Fixed-Type Air Insulated Switchgear (AIS) is a heavy-duty, metal-enclosed switchboard designed to handle high currents and massive short-circuit faults in substations and heavy industrial plants.
Unlike withdrawable switchgear, this fixed-type design mounts the Vacuum Circuit Breaker (VCB) directly within the cubicle. This eliminates the moving parts of a withdrawable chassis, resulting in a simpler, highly robust, and incredibly durable structure. Built to strictly comply with IEC 62271-200, it provides a cost-effective yet rugged solution for main incoming feeds, large motor starting, and heavy-load distribution.
Core Engineering Advantages
• Heavy-Duty Performance: Engineered for primary networks. It easily handles rated currents up to 3150A and extreme short-circuit breaking capacities up to 40kA, making it ideal for the backbone of your power grid.
• Fail-Safe Mechanical Interlocking: We take safety seriously. The switchgear features a comprehensive, forced mechanical interlocking system. This prevents operational errors, such as closing the earthing switch while the circuit breaker is live, or opening the cabinet door when the busbar is energized.
• Visible Isolation Gap: Equipped with top and bottom rotary disconnectors (isolating switches). When maintenance is required, operators can visually confirm the physical break in the circuit through the inspection window, guaranteeing 100% safety before starting work.
• Robust & Low Maintenance: The fixed-type architecture means fewer moving contact alignments and no truck-racking mechanisms to maintain. Once it is installed and bolted down, it delivers decades of stable operation even in vibrating or dusty industrial environments.
• Compartmentalized Design: The metal-enclosed structure is divided into separate compartments (Busbar, VCB, Cable, and Low Voltage) with grounded metallic partitions (PM class), effectively localizing any potential internal faults.
Technical Specifications
Applicable Standards | IEC 62271-200, IEC 62271-100, IEC 62271-102 |
Rated Voltage | 12kV / 24kV |
Rated Frequency | 50Hz / 60Hz |
Insulation Medium | Dry Air |
Rated Current (Busbar & VCB) | 630A / 1250A / 2000A / 2500A / 3150A |
Short-Circuit Breaking Capacity | 25kA / 31.5kA / 40kA |
Short-Time Withstand Current | Up to 40kA for 3s / 4s |
Internal Arc Classification (IAC) | IAC A-FLR up to 40kA / 1s |
Partition Class | PM (Metallic Partition) |
Main Applications
• Utility Substations: Main incoming and feeder panels for primary distribution grids.
• Heavy Industry: Steel mills, cement plants, and petrochemical refineries requiring large motor control and high-current distribution.
• Mining & Minerals: Rugged environments where equipment must withstand dust, vibration, and continuous heavy-duty cycles.
• Power Generation: Auxiliary power distribution systems in conventional and large-scale renewable power plants.
