KYN28-12(GZSI-12Z) Armoured Middle-Mounted Metal Enclosed Switchgear

KYN-12(gzsi-12Z) Armoured middle mounted metal enclosed switchgear is our new designed and developed products which could be configured with VD-4 type vacuum circuit breaker produced by ABB, Schneider HVX, C3 series fixed load switch, meanwhile it also can be assembled with several domestic vacuum circuit breakers(such as VS1, VH1, VK, ZN28).

Product Details


KYN28-12 armoured middle-mounted metal enclosed switchgear (hereinafter referred to as switchgear) is our new designed and developed product on the basis of absorbing advanced technology abroad, which can replace the old metal enclosed switchgears, such as KYN1-10, JYN2-10, GBC-10 series, etc.

The shell whose mechanical strength is high is assembled when coated Al-Zn steel plates are processed, bended and molded by CNC machine tool so that tidy and beautiful product is ensured. The door is plastic sprayed coating therefore, it has the high impact resistance and corrosion resistance ability. The protection grade of shell is IP4X.

The main switch can be configured with VD4-type vacuum circuit breaker produced by ABB, Schneider HVX, C3 series fixed load switch, meanwhile, it also can be assembled with several domestic vacuum circuit breakers (such as VS1, VH1, VK, ZN28) to replace the similar domestic products.

No matter which kind of circuit breaker is chosen, the air insulation distance of bare conductor should be more than 125mm, the compound insulation distance should be more  than 60mm. The circuit breaker has the special advantages : long service life, high parameter, less maintenance and small size.

Model Definition

Operational Environment

a. Ambient Temperature: -10~+45℃
b. Relative Humidity: Daily average
should be less than 95%, monthly average is not more than 90%
Altitude: Not higher than 1000m, if more than 1000, decrease capacity according to the altitude.

d. The seismic intensity should be less than 8-magnitude.
e. It should be operated in the place without danger of fire, explosion, serious dirtiness, chemical corrosion and acute shaking.
If it is planed to operate in the condition out of the above limits, the customers should negotiate with us to decide the allowable operational conditions and technical measures.

Switchgear Schematic Diagram

1  -Cabinet                   11-The control line slot  

2  -Branch bar              12-Cable seal terminal 

3  -Busbar                    13-Grounding switch operating mechanism

4  -Isolated contacts    14-Detachable horizontal clapboard

5  -Contact box            15-Wire rod mechanism  

6  -Earthing switch       16-VCB

7  -Current transformer  17-Secondary plug

8  -Zinc oxide arrester    18-Terminal board

9  -Baseplate                  19-Shutter

10-Main grounding busbar     20-Detachable clapboard  

21-Pressure release

Installation Dimensions

Technical Parameters




Rated voltage



Rated frequency



Rated current of circuit breaker


630, 1250, 1600, 2000, 2500, 3150

Rated current of switchgear


630, 1250, 1600, 2000, 2500, 3150

The short-time withstand current (4s)


20, 25, 31.5, 40, 50

Rated dynamic stability current (peak)


50, 63, 80, 100, 125

Rated short circuit breaking current


20, 25, 31.5, 40, 50

Rated short circuit closed current (peak)


50, 63, 80, 100, 125

Rated insulation level

1 min power frequency withstand voltage


24  3  42

Lighting impulse withstand voltage


40  60  75

Protection level

Shell IP4X, IP2X when the isolation room door and circuit breaker room door opened.

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