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KYN28-12 Series
Metal-clad Ring Main Unit Switchgear

KYN28-12 Series Metal-clad Ring Main Unit Switchgear


KYN28-12 Series Metal-clad Ring Main Unit Switchgear is suitable for receiving and distributing electric energy from a 12kV (50Hz) power grid. KYN28-12 series can adopt single bus, single bus segmented system or double bus system. KYN28-12 series can control, monitor and protect the circuit. KYN28-12 series is composed of a fixed cabinet body and withdrawable parts (referred to as a handcart or trolley). The shell of the KYN28-12 series cabinet and the partitions of each functional unit are connected by bolts. KYN28-12 series switch cabinet can be equipped with a vacuum circuit breaker handcart or a fixed load switch. KYN28-12 series switchgear can be installed in double rows (back-to-back or face-to-face).

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Basic Parameters

Rated voltage: 3.6/7.2/12KV

Rated frequency: 50Hz

Rated normal current(Circuit Breaker) (A): 630, 1250, 1600, 2000, 2500, 3150

Rated normal current(Cabinet) (A): 630, 1250, 1600, 2000, 2500, 3150

Rated short-time withstand current (in 4 sec) (KA): 16, 20, 25, 31.5, 40, 50

Rated dynamic stability current (peak) (KA): 40, 50, 63, 80, 100, 125

Rated short-circuit breaking current (KA):  16, 20, 25, 31.6, 40, 50

Rated making current (peak) (KA): 40, 50, 63, 80, 100, 125

1min power frequency withstand voltage(KA): 24, 32, 42

Rated lightning impulse withstand voltage(KA): 40, 60, 75

Ingress protection ratings: the cabinet shell is IP4X; when the door of the isolation room and circuit breaker room is opened, it is IP2X

Applied standard: IEC298,IEC694,GB3906,DIA04,DIN.VDE0670


The switch cabinet shell is completely assembled by bolts, with high mechanical strength, which effectively ensures the neatness and beauty of the product.

The cabinet door is spray-coated, which has strong impact resistance and corrosion resistance.

No matter what kind of circuit breaker is selected, the air insulation distance of the bare conductor can be guaranteed to be greater than 125mm, and the composite insulation is greater than 60mm.

The circuit breakers in the switch cabinet have the advantages of long life, low maintenance and small size.

Application Environment

Ambient temperature: -10℃~+40℃, the average value of 24h does not exceed +35℃

Altitude: ≤1000m

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

Water vapor pressure: daily average ≤2.2kPa, monthly average ≤1.8kPa

Seismic fortification intensity: Ⅷ

Installation site: no severe vibration and impact, and no fire, chemical corrosion, explosion and other dangers.

* If you need to customize according to your special needs, please contact us.

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