KYN28A-12 Armored Removable AC Metal Enclosed Switchgear

KYN28A-12 is a widely used indoor armored removable metal-enclosed switchgear for 12kV medium-voltage AC distribution systems. It adopts a fully metal-clad compartmental structure, separating busbar, breaker, cable and control rooms independently to enhance operational safety. Equipped with a withdrawable vacuum circuit breaker trolley and complete mechanical interlock system, it eliminates incorrect switching operations. Featuring compact structure, high reliability and low maintenance cost, this switchgear is extensively used in residential districts, commercial buildings, industrial plants, substations and municipal power supply projects.

Customize from Our Standard Product Line

If you spot a near-match in our catalog, we can quickly modify our standard transformers for your application. Adjustments cover capacity, voltage class, cooling type and installation structure.

Build per Your Technical Documents

Send us your specifications or drawings. Our engineering team reviews the design, validates all key parameters with you, and manufactures strictly in accordance with international standards.

Full Custom Design from Concept to Completion

Without formal detailed specs? Share your ideas and functional requirements. We partner with you to develop fully customized transformer solutions, from electrical design and structural layout through to insulation system.

Overview
Product Overview
Applications and Use Cases
Application
FAQ

Overview

Product Overview & Design Highlights

Product Overview and Key Features

The KYN28A‑12 armored removable AC metal enclosed switchgear is a metal‑clad, armor switchgear assembly designed for 12kV medium‑voltage systems. With a modular structure and removable components, the KYN28A‑12 switchgear balances the need for compact installation, seamless renewable grid integration, and simplified maintenance across modular substation solutions. Each unit integrates armor switchgear compartments, vacuum circuit breakers, busbar systems, protection relays, and auxiliary circuits within a rugged metal enclosure, making the KYN28A‑12 switchgear an essential choice for modern modular substation solutions and renewable grid integration projects

Product Overview

Design Highlights

Modular Architecture: The KYN28A‑12 switchgear adopts a modular configuration to support scalable deployments. Individual armor switchgear cells are removable and interchangeable, enabling rapid replacement and system expansion without major downtime while advancing modular substation solutions
Removable Components: Each armor switchgear bay includes removable vacuum circuit breaker units and withdrawable running gear, facilitating safe isolation and fast maintenance cycles
Metal Enclosure and Armor Protection: The robust metal‑enclosed design safeguards internal components against mechanical damage and environmental stressors. Encapsulated armor switchgear designs enhance reliability for installations in harsh environments, including coastal, mining, and heavy industrial sites
Safety and Compliance: Manufactured according to international standards, the KYN28A‑12 switchgear emphasizes operator safety with interlocking mechanisms, clear grounding procedures, and arc‑resistant features

Technical Advantages and Innovation

Ease of Maintenance: Removable components, withdrawable breakers, and clear access panels allow technicians to perform inspections and repairs quickly and safely on the KYN28A‑12 switchgear. This design reduces downtime and operational costs
Scalability: The modular nature of the KYN28A‑12 switchgear allows operators to expand capacity incrementally, supporting phased growth and adaptive network planning. Customers adopting modular substation solutions benefit from lower initial capital expenditure and flexible expansion paths
Integration for Renewables: The KYN28A‑12 switchgear supports modern power electronics and distributed energy resources through adaptive protection settings and communication protocols

Core Merits
1. High Safety Performance: Independent compartment structure and reliable five‑prevention interlock mechanism completely prevent mis‑operation, ensuring personnel and equipment safety
2. Compact & Space‑saving: Optimized cabinet layout reduces overall floor space, suitable for various compact distribution rooms
3. Flexible Maintenance: Standard withdrawable VCB trolley supports fast replacement and convenient daily inspection, greatly lowering maintenance downtime
4. Stable & Durable: Adopts high‑quality vacuum interrupter and insulating materials, featuring strong short‑circuit resistance and long service life

Applications and Use Cases

Utility Substations: As a core element of medium‑voltage distribution, the armor switchgear provides reliable switching, protection, and Sectionalizing functions
Modular Substation Solutions: The KYN28A‑12 switchgear is ideal for modular substation solutions where rapid deployment, transportation, and plug‑and‑play installation are priorities
Renewable Grid Integration: For renewable grid integration projects, such as wind farms and solar parks, the KYN28A‑12 switchgear supports the distributed connection of array feeders, inverters, and energy storage systems to accelerate renewable grid integration goals
Industrial Plants and Mining: Facilities with heavy‑duty operational conditions benefit from armor switchgear durability. The KYN28A‑12 switchgear resists dust, moisture, and mechanical abrasion, reducing the risk of unexpected outages in demanding industrial environments utilizing compact modular substation solutions

Application

Application Scenarios

Utility substations for urban & rural medium‑voltage distribution networks

Modular & container‑type substations for fast‑track projects

Wind & solar power plants and energy storage station switch‑rooms

Heavy‑industry plants, mines and large manufacturing facilities

Commercial complexes and large public building power distribution rooms

FAQ

Frequently Asked Questions

Q1: What is a metal‑clad withdrawable switchgear? What are its main featuresA: A metal‑clad withdrawable switchgear (such as the KYN series) is a fully enclosed, fully compartmentalised power distribution device. Its distinctive feature is that the busbar compartment, circuit breaker compartment, cable compartment, and instrument compartment are independently separated from each other, with each compartment using metal partitions that are grounded and shielded. The core advantages are: the withdrawable circuit breaker trolley can be flexibly pulled out, facilitating online inspection, maintenance, or rapid replacement, which greatly reduces outage time. At the same time, the strict compartmentalised design effectively limits the scope of internal fault arc hazards, enhancing operational safety

Q2: What is the "five‑prevention interlocking" function of a switchgear, and why is it importantA: The "five‑prevention interlocking" is a mandatory mechanical or electrical interlocking device that ensures operator safety and reliable equipment operation. It includes:
Preventing incorrect opening or closing of the circuit breaker;
Preventing opening or closing of the Disconnector (ie., the trolley) under load;
Preventing the closing of the earthing switch when the equipment is live;
Preventing the closing of the circuit breaker when the earthing switch is closed (ie., with an earth connection);
Preventing inadvertent entry into live compartments
This design physically eliminates the possibility of human mis-operation and is a core requirement of electrical safety regulations

Q3: How do I choose between fixed‑type and withdrawable (trolley‑type) switchgear based on project requirementsA: The choice mainly depends on the requirements for power supply reliability and maintenance efficiency
Withdrawable type (eg., KYN series): Recommended for critical loads, applications requiring frequent operation, or scenarios demanding rapid fault recovery (such as large factories and data centres). The circuit breaker trolley can be kept as spare inventory; in case of a fault, it can be directly replaced as a whole, restoring power very quickly
Fixed type (eg., GGD, XGN series): Suitable for applications with stable loads and less stringent outage time requirements (such as general building power distribution). They have a simpler structure and relatively lower cost, but maintenance typically requires an overall busbar outage

Q4: What are the insulation methods for high and low voltage switchgear, and what are their advantagesA: Currently, there are three main insulation methods:
Air insulation (traditional): Uses air as the insulating medium. It has a straightforward structure and is easy to maintain, but the cabinet size is relatively large
Solid insulation (composite insulation): Uses epoxy resin or vulcanised silicone rubber to encapsulate conductors, significantly reducing cabinet size It offers strong anti‑pollution performance and is suitable for high‑humidity or high‑altitude areas
Gas‑insulated (GIS switchgear): Uses SF₆ (sulfur hexafluoride) or environmentally friendly gases for insulation. It has the smallest footprint, is fully sealed and maintenance‑free, but has a higher cost. We can recommend the most suitable solution based on the project environment

Q5: What key tests are performed on the switchgear before deliveryA: To ensure delivery quality, we conduct a complete factory inspection. Core tests include:
Power‑frequency withstand voltage test: Verifies the insulation strength of the main insulation to ground and between phases
Mechanical operation test: Tests the opening and closing operation reliability of circuit breakers, Disconnectors, and interlocking devices - ≥200 operations
Main circuit resistance measurement: Ensures contact resistance is within standard limits to avoid overheating during operation
Auxiliary circuit and control circuit functional test: Ensures proper operation of protection, signalling, and metering circuits
All tests are strictly performed in accordance with IEC 62271‑200 and GB 3906 standards

KYN28A-12 Armored Removable AC Metal Enclosed Switchgear

Customize from Our Standard Product Line

If you spot a near-match in our catalog, we can quickly modify our standard transformers for your application. Adjustments cover capacity, voltage class, cooling type and installation structure.

Build per Your Technical Documents

Send us your specifications or drawings. Our engineering team reviews the design, validates all key parameters with you, and manufactures strictly in accordance with international standards.

Full Custom Design from Concept to Completion