Mid-mounted cabinet: KYN28A-12

The 10kV mid-mounted cabinet, officially termed Armored Enclosed Switchgear (AEI), is a core power distribution device in electrical systems responsible for energy reception and distribution. Its name derives from the central placement of the circuit breaker trolley within the cabinet. Widely deployed in industrial and mining facilities, infrastructure projects, and 10kV substations, this equipment performs critical functions including control, protection, monitoring, and isolation.

Model KYN28A-12

product description

The product features a highly modular design. Key components such as the circuit breaker and isolation carriage are mounted on a removable cart, enabling flexible operation and easy maintenance through multiple positioning states including working, testing, isolation, and removal. The cabinet is constructed from high-quality aluminum-zinc coated steel plates through multiple bending processes, forming a fully enclosed metal armor structure. It is divided into isolated compartments: busbar room, circuit breaker cart room, cable room, and instrument relay room, ensuring operational safety and preventing fault escalation.
The mid-mounted cabinet features a comprehensive "five-prevention" locking mechanism to prevent accidental operation. Its core specifications typically include a rated current of 1250A to 3150A and a short-circuit breaking capacity of 25kA to 40kA. Optional integrated protection devices enable intelligent measurement and protection. Designed in strict compliance with domestic and international standards such as GB and IEC, this product stands out with high reliability, compact structure, user-friendly operation, and safe maintenance, making it the preferred equipment for modern distribution network construction.

Key technical parameters

Project‌	Unit‌	numerical value ‌
Rated Voltage	KV	24
Rated Frequency	Hz	50/60
Lightning Impulse Withstand Voltage (Peak)	KV	Phase-to-phase: 60;
Lightning Impulse Withstand Voltage (Peak)	KV	Isolation break: 79
1min Power Frequency Withstand Voltage（effective value ）	KV	Phase-to-phase:125;
1min Power Frequency Withstand Voltage（effective value ）	KV	Isolation break: 145
Auxiliary control circuit withstand voltage at power frequency	V	200
Rated Current	A	63,012,501,600,200,000,000,000
Rated Short-Circuit Interrupting Current	KA	20/31.5
Rated Short-Circuit Closing Current (Peak)	KA	50/80
Rated Short-Time Withstand Current	KA	20/31.5
Rated Peak Withstand Current	KA	50/80
Auxiliary Control Circuit Rated Voltage	V	DC or AC 110/220
Protection Degree	-	IP4X（The circuit breaker room door is open or the compartment is IP2X.）IP4X
External Dimensions (Width×Depth×Height)	MM	800×1810×2380/1000×1810×2380
Weight	Kg	840-1440

Operating Conditions

Ambient temperature

Maximum +40°C, minimum-15°C (under special processes, may reach-45°C).

Ambient humidity

Daily average <95%, monthly average ≤90%.

Altitude

Below 1000m.

Seismic resistance

Earthquake intensity not exceeding magnitude 8.

Surrounding air should be free from corrosive or flammable gases, water vapor, and other significant pollutants.
No severe contamination or frequent violent vibrations; In harsh conditions, the severity design must meet Class 1 requirements.
For use under normal environmental conditions exceeding GB3906 standards, the user and manufacturer shall negotiate.
Note:
① When the relative humidity exceeds 70%, the electric heater should be activated.
② For locations above 1000 meters in altitude, follow the procedures specified in JB/Z102-71.

Based in Guangzhou Economic and Technological Development Zone, the company operates a 20,000-square-meter factory equipped with cutting-edge equipment imported from Switzerland, the United States, and Taiwan. For over two decades, Keming has earned industry-wide acclaim for its premium products and services. Its solutions are widely adopted in power distribution, real estate, manufacturing, battery swapping, energy storage, photovoltaic systems, and EV charging infrastructure.

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