KYN28 Medium Voltage Switchgear: Combining Superior Safety, Modular Flexibility

With industrial land costs rising and maintenance teams under increasing pressure to minimize downtime, BeiKe has introduced its KYN28 medium voltage switchgear—a solution engineered to tackle two of the most persistent challenges in power distribution: space constraints and operational efficiency.

The KYN28-12 series is a metal-clad, withdrawable AC metal-enclosed switchgear designed for 3.6–12kV three-phase AC 50Hz systems, widely used in power plants, industrial facilities, commercial buildings, and secondary substations for power receiving, distribution, control, protection, and monitoring of circuits. The unit complies with international standards including GB3906, GB/T 11022, DL/T404, and IEC62271-200.

Uncompromising Safety: Protecting Both Equipment and Personnel

Safety remains the foremost concern in medium voltage power distribution. The KYN28 series incorporates a comprehensive "five-prevention" interlock system that reliably prevents five critical types of misoperation: closing the circuit breaker with a load, pushing or pulling the truck under load, closing the grounding switch with live parts, energizing with the grounding switch closed, and inadvertently entering live compartments. This interlock mechanism, combined with a fast-closing grounding switch for reliable protection grounding, ensures both operational safety and personnel protection.

The board employs a fully metal-armored and completely enclosed structure, with internal compartments—including the busbar chamber, circuit breaker chamber, cable chamber, and relay instrument chamber—each isolated from one another. In the event of an internal arc fault, pressure relief devices installed above each compartment automatically activate to release pressure, protecting operators and equipment. The cabinet achieves an IP4X protection rating for the enclosure, with IP2X protection when the circuit breaker compartment door is open. All operations are performed with the cabinet door closed, ensuring operator safety throughout the process.

Modular Design: Simplifying Maintenance and Enhancing Flexibility

The KYN28 series features a modular, withdrawable circuit breaker design that significantly reduces maintenance complexity and downtime. The medium voltage circuit breaker is mounted on a withdrawable truck that moves smoothly along guide rails between test and working positions. The rear wall of the truck compartment is fitted with a shutter mechanism that automatically closes the static contact isolation plate when the truck is withdrawn, preventing operators from accidentally contacting live parts.

A key advantage of this modular approach is the excellent interchangeability of trucks of the same specification. When a circuit breaker requires maintenance or replacement, a spare truck can be swiftly inserted, restoring power distribution in minutes rather than hours. For maintenance personnel, the breaker compartment and cable compartment can both be equipped with lighting devices upon request, facilitating inspection and repair work. The cabinet is designed for full front access—all installation, commissioning, and maintenance can be performed from the front, eliminating the need to access the rear of the unit.

Compact Footprint: Saving Valuable Floor Space

In markets where industrial land is at a premium, the physical footprint of power distribution equipment directly impacts project costs. The KYN28 series employs a mid-position truck structure that saves approximately 50 percent of the circuit breaker compartment space compared to conventional designs, enabling more efficient cable installation. The cabinet can be installed against a wall or arranged back-to-back to form dual rows, significantly reducing the overall footprint.

For customers seeking even greater space efficiency, the KYN28Z variant takes compact design a step further through combinatorial optimization. By integrating two standard units into a single cabinet while maintaining the same external dimensions, this solution reduces floor space consumption by half, lowers raw material usage, and delivers substantial cost savings—making it particularly attractive for smaller industrial facilities where every square meter matters.

The reduced footprint translates directly into lower civil construction costs for power distribution rooms and substations. Customers can either downsize their planned facility or free up valuable space for other operational needs.

A Proven Solution Across Diverse Applications

The KYN28 series is available with rated currents ranging from 630A to 4000A and rated short-circuit withstand currents from 20kA to 50kA, with external dimensions of 800 (650 or 1000) mm in width × 1500 (or 1800) mm in depth × 2365 mm in height. It supports a wide range of functional configurations, including incoming/feeder boards, bus-tie boards, isolation boards, PT boards, metering boards, and auxiliary transformer boards, which can be flexibly combined to suit different application scenarios and power distribution requirements.

Typical applications include power plants, industrial and mining facilities, commercial high-rises, municipal infrastructure projects, and renewable energy installations. The switchgear complies with LSC2B operational continuity category requirements, ensuring reliable performance even under demanding conditions.

For more information about Beike's KYN28 medium voltage switchgear or to request a quotation, please contact the sales team at the information provided on our website.

About BeiKe

BeiKe (Shanxi Beike Electric Co., Ltd.) is a professional manufacturer specializing in medium and low voltage power distribution equipment, including medium voltage switchgear, ring main units, and prefabricated substations. With a commitment to quality, safety, and customer-focused innovation, BeiKe delivers reliable power distribution solutions to clients worldwide.