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KYN28A-12 Medium-voltage Switchgear


KYN28-12 indoor metal-clad withdrawable medium Voltage switchgear is a complete power distribution device for 7.2-12kV, 3-phase AC 50Hz, single busbar and single busbar segmented system. 

It is mainly applicable in power plant, substation, mineral enterprise to receive and distribute power with the functions of controlling,protecting and monitoring circuits; and can also be used at the sites with frequent operations. 

Highlight Features

  • Complies with IEC60289, GB3906 and DL404 standard.

  • Metal-clad and partition completely, effectively prevent faults spreading.

  • The low voltage and high voltage section is completely separated.

  • Enclosure protection degree of IP4X, protect against electric shock and ingress of solid foreign bodies.

  • Simple but effective interlocking prevents misoperation.

  • Space is provided for multiple cable connections.

  • Front-face and double-face maintenance. 

  • Withdrawable part of the same design are mutually interchangeable, exchanging VCB is very simple. 

  • The enclosure is made of Aluminium-zinc plated steel with high precise dimension, short production cycle, excellent mechanical strength and nice appearance. 

  • The switchboard door is sprayed with plastic, also has strong capacity of impact resistance and corrosion protection. 

  • Various vacuum circuit breakers can be used, i.e VD4 from ABB, 3Ah% from Siemens, VB2 from GE, many other domestic breakers (VS1, VH1, VK, ZN28) and etc.


The basic structure of the switchgear panel is comprised with the panel itself and draw-able part.

The panel is consisted by four separated compartments: truck, busbar, cable and low-voltage compartment. 

And the draw-able units can be divided into the following units according to its own functions.

  • VCB truck

  • PT truck

  • Disconnect truck

  • Metering truck

  • HV fuse truck

  • Lightning arrester truck etc.

Technical Specifications

VCB SwitchgearF-C Switchgear
Rated Voltage                                                            kV7.2   127.2    12
Rated Power-frequency Withstand Voltage (1min)  kV32    4232     42
Rated Lightning Impulse Withstand Voltage            kV60    7560     75
Rated Frequency                                                       Hz5050
Main Busbar Rated Current                                       A...4000...4000
Branch Busbar Rated Current                                    A...4000...400
Rated Short-time Withstand Current (rms)               kA...404kA/4s
Rated Peak Withstand Current                                  kA...10010
Enclosure Protection LevelIP4XIP4X

Dimension (for VD4 breaker)

Height (mm)2200
Width (mm)Rated Current 1250A&below800, 650
Rated Current 1600A&above1000
Depth (mm)Front Maintenance1350
Double-face Maintenance1500/1560
F-C Switchgear    (mm)2200 x 650 x 1560
(Height, Width, Depth)

Operating Condition

  • Ambient temperature: -10℃ to +40℃.

  • Altitude: ≤ 1000m.

  • Relative humidity:daily average ≤ 95% ,monthly ≤ 90%.

  • Shock of earthquake:less than 8 magnitude.

  • Should not be used in fire, explosion, earthquake and chemical corrosion environments. 

Note: Please consult with manufacture for special condition and requirements. 

Product Inquiry


  +8618874901949



Widely used in the national grid, subway, petrochemical, automotive, telecommunications and other fields...

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