KYN28A-12(GZS1) Armored Withdrawable Type AC Metal-Enclosed Switchgear

Q: What is KYN28A‑12 (GZS1) switchgear?

KYN28A‑12 (GZS1) is a type of medium‑voltage armored withdrawable AC metal‑enclosed switchgear used in 3.6–12 kV three‑phase AC power systems for receiving, distributing, controlling, protecting, and monitoring electric circuits.

Q: Where is this switchgear typically used?

It is commonly installed in indoor power distribution systems such as substations, power plants, industrial facilities, commercial buildings, and utility distribution centers where reliable medium‑voltage control and distribution are required.

Q: What are the rated technical parameters?

Typical ratings include 3.6–12 kV system voltage , rated current up to 3150A–4000A , and design for AC 50/60 Hz three‑phase networks. It supports various circuit configurations like single‑bus or sectionalized bus systems.

Q: What are the main components inside the cabinet?

Key components include a withdrawable circuit breaker car , busbar compartments , cable compartments , low‑voltage control section , current/voltage transformers , and safety interlocks. The withdrawable unit design allows easier maintenance and testing.

Q: What safety and interlock features are included?

Switchgear of this type usually incorporates a “five‑prevention” interlock system to prevent dangerous operations such as closing the breaker under load during grounding, or mis‑insertion/removal of the breaker car under unsafe conditions.

KYN28A-12(GZS1) Armored Withdrawable Type AC Metal-Enclosed Switchgear (hereinafter referred to as “switchgear”) is designed for three-phase 50Hz or 60Hz power systems, primarily used for receiving and distributing electrical energy, as well as for controlling, protecting, and monitoring electrical circuits. This switchgear complies with various international standards, including GB3906 “3~35kV Metal-Enclosed Switchgear,” GB/T11022 “Common Technical Requirements for High Voltage Switchgear and Control Equipment,” and IEC60298 “Metal-Enclosed Switchgear and Controlgear for Rated Voltage Above 1kV and Up to 50kV.”

Key Features:

The KYN28A-12 is a 12kV indoor armored withdrawable metal-enclosed switchgear with a compact structure and strong versatility. It adopts a modular design for the handcart, featuring a complete five-prevention interlock system, ensuring safety and reliability. It is equipped with vacuum circuit breakers, which have excellent breaking performance and long electrical life. The layout of the busbar and cable compartments is reasonable, providing excellent heat dissipation and convenient maintenance. It is widely applicable to power distribution systems in industries, mines, and power grids, and operates stably.

Why Choose the KYN28A-12(GZS1) Armored Withdrawable Type AC Metal-Enclosed Switchgear?

KYN28A-12(GZS1) Switchgear features an all-metal modular assembly structure, with a cabinet made from high-strength materials that are lightweight yet robust. The switchgear can accommodate up to 9 single-core cables, with pressure relief channels in each compartment to ensure operational safety. Additionally, each position is equipped with positioning and display devices to enhance operational safety and reliability.

Product Advantages

Safe and Reliable: The armored metal-enclosed structure with a complete five-prevention interlock system effectively prevents misoperation.

Excellent Performance: Compatible with vacuum circuit breakers, offering strong breaking capacity, long electrical life, and stable operation.

Easy Maintenance: The withdrawable truck design allows quick inspection and maintenance without affecting the power supply of other circuits.

Compact Structure: Small size and well-organized layout help save installation space and suit various indoor environments.

High Versatility: With a high degree of standardization, the cabinet can be flexibly configured to meet different power distribution system requirements.

Operating Conditions

Environmental Temperature: Maximum +40℃, minimum -15℃.

Relative Humidity: Daily average relative humidity ≤ 95%; monthly average relative humidity ≤ 90%.

Altitude: ≤ 1000m.

Seismic Intensity: Not exceeding 8 degrees.

Air Quality: The surrounding air should be free from significant contamination by corrosive or flammable gases.

Vibration: The operating environment should be free from severe vibrations.

Application

The KYN28A-12(GZS1) Switchgear is mainly used in indoor substations, industrial and mining enterprises, commercial buildings, and industrial parks with voltages ranging from 3.6 to 12 kV. It is designed to achieve the reception, distribution, and protection of electrical energy.

Model meaning

Technical Parameters

Overall and mounting dimensions(mm)（Reference）

Model meaning

KYN28A-12(GZS1) Armored Withdrawable Type AC Metal-Enclosed Switchgear	K:	Armored metal-enclosed switchgear
	Y:	Withdrawable (draw-out type)
	N:	Indoor installation
	28A:	Design series number
	12:	Rated voltage 12kV (10kV system)

Technical Parameters

Item	Parameter
Rated Voltage	12kV
Rated Frequency	50Hz
Rated Current	630A / 1250A / 1600A / 2000A
Rated Short-Circuit Breaking Current	20kA / 25kA / 31.5kA
Rated Short-Time Withstand Current (4s)	20kA / 25kA / 31.5kA
Rated Peak Withstand Current	50kA / 63kA / 80kA
1-Minute Power Frequency Withstand Voltage	42kV (phase-to-phase / phase-to-ground)
Lightning Impulse Withstand Voltage	75kV
Degree of Protection	IP4X (enclosure), IP2X (with breaker compartment door open)
Operating Mechanism	Spring operating mechanism
Installation Method	Indoor floor-mounted installation

Overall and mounting dimensions(mm)（Reference）

KYN28A-12 Dimension Drawing

Custom KYN28A‑12(GZS1) Armored Withdrawable AC Metal‑Enclosed Switchgear Solutions for Your Project

(The values can be customized according to local project requirements.)

If you have specific requirements for the parameters, structure, or configuration of the KYN28A‑12(GZS1) armored withdrawable AC metal‑enclosed switchgear, please contact us. Our team of account managers, technical engineers, and product consultants will assess your electrical distribution design, rated parameters, control needs, installation environment, and project timeline to deliver a tailored solution that aligns with your system requirements.

We can customize the rated voltage (typically up to 12 kV), rated current capacity, short‑circuit withstand levels, vacuum circuit breaker type (such as domestic VS1 or imported VD4 series), compartment layout, busbar scheme (single, sectionalized, or dual), interlocking systems, enclosure protection grade, monitoring modules, and other key design details to ensure dependable performance in your medium‑voltage power distribution network. This switchgear is suitable for receiving and distributing electric energy and for controlling, protecting, and monitoring circuits in power plants, substations, industrial and mining facilities, and other critical applications where reliable medium‑voltage distribution is essential.

FAQ

What is KYN28A‑12 (GZS1) switchgear?

KYN28A‑12 (GZS1) is a type of medium‑voltage armored withdrawable AC metal‑enclosed switchgear used in 3.6–12 kV three‑phase AC power systems for receiving, distributing, controlling, protecting, and monitoring electric circuits.

Where is this switchgear typically used?

It is commonly installed in indoor power distribution systems such as substations, power plants, industrial facilities, commercial buildings, and utility distribution centers where reliable medium‑voltage control and distribution are required.

What are the rated technical parameters?

Typical ratings include 3.6–12 kV system voltage, rated current up to 3150A–4000A, and design for AC 50/60 Hz three‑phase networks. It supports various circuit configurations like single‑bus or sectionalized bus systems.

What standards does this switchgear comply with?

This type of switchgear is designed to meet industry standards such as GB3906 (AC metal‑enclosed switchgear), GB/T11022 (common technical requirements) and IEC62271‑200 for medium‑voltage switchgear safety and performance.

What are the main components inside the cabinet?

Key components include a withdrawable circuit breaker car, busbar compartments, cable compartments, low‑voltage control section, current/voltage transformers, and safety interlocks. The withdrawable unit design allows easier maintenance and testing.

What safety and interlock features are included?

Switchgear of this type usually incorporates a “five‑prevention” interlock system to prevent dangerous operations such as closing the breaker under load during grounding, or mis‑insertion/removal of the breaker car under unsafe conditions.

What protection level and insulation features are typical?

The metal‑enclosed structure is fully shielded with high mechanical strength. It typically achieves IP4X protection level for the enclosure and maintains adequate electrical clearances to prevent flashovers and ensure operator safety.

Can the switchgear support different types of vacuum circuit breakers?

Yes. Such switchgear is compatible with various vacuum circuit breakers, including VS1, ZN28 (domestic) or VD4 (imported) series, depending on project needs for breaking capacity or operation frequency.

What environmental and installation conditions should be considered?

Typical normal use conditions include ambient temperatures from about ‑15 °C to +40 °C, relative humidity limits, installation altitudes under ~1000 m, and locations free from corrosive gases, excessive dust, and severe vibration.

Can this type of switchgear be customized for specific projects?

Yes. Medium‑voltage metal‑enclosed switchgear can be tailored with different circuit schemes (single bus, double bus), insulation and protection options, instrumentation, control relays, and other features based on specific electrical distribution requirements.

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