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High Voltage Switchgear
9 Series · 82 Models
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High Voltage Switchgear Overview
High-voltage switchgear performs switching, protection, and control at the distribution level of power systems. QDTB offers metal-clad air-insulated switchgear, gas-insulated switchgear (GIS), and outdoor circuit breakers covering 12-40.5 kV, engineered to IEC 62271 and GB 3906. Key selection factors include rated short-circuit breaking capacity, busbar current, and the protection scheme. QDTB panels support overcurrent, earth fault, differential, and distance protection, with IEC 61850 communication for SCADA integration.
Available Series
SRM16 Series
The SRM16 series metal-clad withdrawable switchgear provides reliable medium voltage power distribution with withdrawable circuit breaker compartments. Features compartmentalized design for enhanced safety and easy maintenance access.
KYN28A Series
The KYN28A series is an improved variant of the KYN28 metal-clad withdrawable switchgear. Features enhanced compartmentalization, advanced interlocking systems, and VCB/VBI vacuum breaker integration for reliable 12kV power distribution.
KYN61 Series
The KYN61 series 40.5kV metal-clad withdrawable switchgear is designed for medium voltage power distribution at the 40.5kV level. Equipped with VBI/VCB vacuum breakers, suitable for power generation, mining, and petrochemical plant applications.
HXGN15 Series
The HXGN15 series fixed-type SF6 insulated switchgear provides an economical solution for ring main and terminal distribution applications. Type-tested to IEC 62271-200, features SF6 gas insulation for reliable indoor switching performance.
HXGN Series
The HXGN series fixed-type air-insulated switchgear provides a cost-effective solution for secondary distribution applications. Features air insulation for easy maintenance access and reliable indoor switching performance.
XGN2 Series
The XGN2 series fixed-type HV switchgear provides an economical alternative to withdrawable type switchgear for industrial power distribution and substation applications. Features robust fixed installation design with reliable circuit breaker integration.
KYN28 Series
The KYN28 series 40.5kV withdrawable switchgear features compact design with integrated vacuum circuit breakers. Suitable for mining, petrochemical, and power plant auxiliary power distribution applications requiring reliable medium voltage switching.
GCS-12(Z) Series
The GCS series medium-position withdrawable switchgear features compact design for restricted space installations. Equipped with VCB and drawout carriage mechanism, provides reliable medium voltage switching with efficient space utilization.
XGN66 Series
The XGN66 series air-insulated fixed switchgear provides economical medium voltage switching for indoor distribution applications. Features SF6 load break switch with metal-enclosed busbar design for reliable and cost-effective distribution network operation.
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Certification
The values below are computed from what you selected above. Anything that cannot be computed yet is shown as an em dash — never as zero.
Iₙ = S / (√3·U) · I_sc = 100·Iₙ / uₖ · S_sc = √3·U·I_sc · I_p = k·Iₖ
Still required to complete the calculation: rated capacity S, impedance voltage uₖ, short-time or peak withstand current.
Per-model values (P0 / Pk / uₖ declared by the factory, losses, noise, temperature rise, dimensions, weight) are not in the product library: those rows stay at an em dash until the factory parameter sheet is supplied. An em dash means the value is unavailable — it is never rendered as zero.
Reference prices are for estimation only and do not constitute a formal offer.
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Application Scenarios
Utility Substations
10-35 kV distribution with feeder protection.
Industrial
Motor control centers for heavy industry.
Power Generation
Generator output switchgear.
Commercial High-Rise
MV incoming up to 35 kV.
Data Centers
High-reliability with rapid fault isolation.
Mining
Ruggedized for harsh environments.
Technical Advantages
Arc-Proof
IEC 62271-200 Class A personnel safety.
Intelligent
IEC 61850 relay compatible.
Flexible
Fixed, withdrawable, GIS designs.
Seismic
Zone 4 compliance.
FAQ - High Voltage Switchgear
What is the difference between AIS and GIS switchgear?
How do I choose the short-circuit rating for switchgear?
What protection functions are available?
What is the typical operating voltage range?
What is the minimum order quantity (MOQ) for High Voltage Switchgear?
What is the delivery time for High Voltage Switchgear?
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All specifications and dimensions can be customized upon request
Metal-Clad AIS vs GIS vs Outdoor Circuit Breaker: How to Choose
| Metal-Clad AIS | Gas-Insulated (GIS) | Outdoor Circuit Breaker | |
|---|---|---|---|
| Insulation | Air clearance between phases in a metal-clad enclosure | SF6 compartment sealed against the atmosphere | Air-insulated structure on a steel frame outdoors |
| Footprint | Wide, because air clearances set the panel width | Smallest of the three at the same voltage | Largest, but installed outdoors where space is cheap |
| Environment | Needs a clean, dry switch room | Suited to humid, coastal and polluted sites | Exposed to weather, so specified with creepage margin |
| Maintenance | Busbars and contacts inspectable in service | Sealed compartments, few routine interventions | Mechanism and insulator checks on a schedule |
| Protection | Relays in a dedicated LV compartment | Relays with IEC 61850 process connections | Relay panel in a separate kiosk or building |
| Extension | Panels added to the same line-up | Modular bays added as new gas compartments | A new bay needs a new structure |
| Typical application | Substations and MV rooms with room to spare | Compact or harsh-environment substations | Utility and industrial outdoor yards |
Where QDTB® High-Voltage Switchgear Is Specified
High-voltage switchgear is specified at the point where a distribution network is switched, protected and metered: utility substations, industrial incoming rooms and generation auxiliary boards. Overcurrent, earth fault, differential and distance protection schemes are configured against the network study, and the panel is then built around the relays rather than the other way round.
Commercial high-rise buildings and data centres choose metal-clad or gas-insulated panels because switch-room floor area is expensive and the protection scheme has to coordinate with the building management and SCADA systems. IEC 61850 communication is what lets the panels report into that single interface.
Mining, coastal and heavily polluted sites select gas-insulated gear, since sealed compartments are unaffected by humidity and airborne contamination that would erode air clearances. Outdoor circuit breakers remain the practical choice where a yard is available and the bays are few.
Panels are engineered to IEC 62271 and GB 3906 across 12 kV to 40.5 kV. Breaking capacity, busbar current and the protection scheme are agreed against the prospective fault level at the installation point before the single-line diagram is frozen.
Frequently Asked Questions
What is the difference between AIS and GIS switchgear?
AIS (air-insulated switchgear) is simpler and lower-cost but larger. GIS (gas-insulated switchgear) uses SF6 to achieve a 70-80% space reduction and is sealed for harsh or space-constrained sites.
How do I choose the short-circuit rating for switchgear?
Match the panel's breaking capacity (in kA) to the prospective fault level at the installation point, with a safety margin. A site fault study determines the correct value.
What protection functions are available?
Overcurrent, earth fault, differential, distance, and under/over-voltage protection are supported, with IEC 61850 communication for SCADA and remote monitoring.
What is the typical operating voltage range?
QDTB high-voltage switchgear covers 12 kV to 40.5 kV, spanning the common medium-voltage distribution levels of 10 kV, 20 kV, and 35 kV.
What is the minimum order quantity (MOQ) for High Voltage Switchgear?
One unit for standard products. Custom-designed equipment is quoted on specifications — send your parameters or drawings and our sales team will confirm the MOQ for your configuration.
What is the delivery time for High Voltage Switchgear?
Standard units are delivered in 30-45 days. Custom or large-capacity units follow a project-specific schedule confirmed at quotation. Rush orders can be accommodated for urgent projects.