KYN28A‑12 Indoor Draw‑out Armored AC Metal‑Enclosed High‑Voltage Switchgear, 12kV

Features :
Indoor removable / draw‑out vacuum circuit‑breaker cabinet
Complete 5‑interlock anti‑misoperation safety protection system
Compact cabinet layout, space‑saving design
Optional VS1, VN2 mid‑mounted vacuum circuit breaker
Heat‑shrinkable / epoxy‑coated bus‑bar insulation
Wide rated‑current range: 630A‑3150A
High short‑circuit withstand performance
Custom‑built cabinet configuration available
Compliant with IEC & GB international standards

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Product Overview：

KYN28A‑12 indoor AC armored removable metal‑enclosed switchgear is suitable for three‑phase AC power systems with rated voltage of 12kV and rated frequency of 50Hz, for receiving and distributing electrical energy, as well as for controlling, protecting and monitoring circuits.

This product complies with the requirements of GB3906 "AC Metal‑enclosed Switchgear for Rated Voltages of 3.6kV to 40.5kV", GB/T11022 "Common Technical Requirements for High‑voltage Switchgear and Control Equipment", IEC60298 "AC Metal‑enclosed Switchgear and Controlgear for Rated Voltages Above 1kV and Up to 52kV", and DL/T404 "Technical Specification for Indoor AC High‑voltage Switchgear".

Full anti‑misoperation interlock functions are equipped: preventing moving‑cart operation under load, forbidding breaker closing while earthing switch is on, avoiding earthing‑switch closing on live circuits and blocking unauthorized access to live compartments. With compact layout, easy‑operation design and stable performance, it delivers high‑safety indoor power‑distribution.

Meaning of Model Number

Meaning of Model Number	K	Y	N	28	‑	12	Z
Explanation	Armored metal‑clad cabinet	Removable / draw‑out type	Indoor installation	Design serial number	Separator	Rated voltage(kV)	Vacuum circuit‑breaker

Service Conditions

Ambient air temperature: Max 40℃, Min ‑15℃
Relative humidity: Daily average ≤95%, daily average water‑vapour pressure ≤2.2kPa; Monthly average ≤90%, monthly average water‑vapour pressure ≤1.8kPa
Altitude: ≤1000m above sea‑level
Earthquake intensity: ≤Grade 8
Surrounding air: No obvious pollution by corrosive or flammable gas, water vapour etc.
No violent vibration at installation site
For operation environments exceeding GB3906 standard conditions, special technical solutions can be negotiated between our factory and buyers

Main Technical Parameters

Item	Unit	Parameter
Rated Voltage	kV	3.6, 7.2, 12
Rated Frequency	Hz	50
Rated Current of Circuit Breaker	A	630, 1250, 1600, 2000, 2500, 3150
Rated Current of Switchgear	A	630, 1250, 1600, 2000, 2500, 3150
Rated Short‑time Withstand Current (4s)	kA	20, 25, 31.5, 40
Rated Peak Withstand Current	kA	50, 63, 80, 100
Rated Short‑circuit Breaking Current	kA	20, 25, 31.5, 40
Rated Short‑circuit Making Current (peak)	kA	50, 63, 80, 100
1min Power‑frequency Withstand Voltage (phase‑to‑earth / between phases)	kV	24, 32, 42
1min Power‑frequency Withstand Voltage (across isolating gap)	kV	28, 32, 42
Lightning‑impulse Withstand Voltage (phase‑to‑earth / between phases)	kV	40, 60, 75
Lightning‑impulse Withstand Voltage (across isolating gap)	kV	46, 70, 85
Protection Degree		Shell IP4X; Between compartments & when breaker‑compartment door open: IP2X

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