Switchgear is the backbone of any distribution system, performing switching, isolation, control and protection functions. A clear understanding of the technical characteristics and applicable standards of each switchgear type is the foundation for correct engineering selection.
For high-voltage switchgear, the KYN28A-12 (withdrawable metal-clad switchgear, 12 kV) is one of the most widely used types in 10 kV distribution. The circuit-breaker truck can be withdrawn for maintenance, improving safety; functionally separated compartments limit fault propagation. It is suitable for power plants, industrial and mining enterprises, and high-rise building substations. The KYN61-40.5 covers the 35 kV level with the same architecture and greater insulation clearances.
For low-voltage distribution, the GCS withdrawable panel and the MNS low-voltage switchgear dominate the market. GCS features modular drawer units for easy maintenance; MNS offers greater configuration flexibility and is widely used in metallurgy and petrochemical applications with large currents. The GGD fixed-type AC low-voltage panel is valued for its simple construction and cost-effectiveness in small-to-medium substations.
Applicable standards: HV switchgear must comply with GB/T 3906 and IEC 62271-200; LV switchgear must comply with GB 7251.1 and IEC 61439-1. Verify type-test reports and CCC certificates at procurement.
Key selection parameters include rated voltage, rated current, short-circuit breaking capacity, IP rating and main busbar cross-section. For smart-grid projects, check whether the switchgear supports intelligent circuit breakers, remote I/O interfaces (RS-485, Ethernet) and pre-wired power quality monitoring units.
SAD (Zhejiang Shidian Complete Electrical Equipment) supplies complete solutions from 10 kV HV switchgear to 0.4 kV LV distribution panels, including non-standard customisation. Contact us at 21b.cn for technical datasheets or samples.