KYN28A-12 MV Switchgear Selection Guide for EPC and Industrial Projects

What should be confirmed before selecting KYN28A-12 switchgear?

KYN28A-12 is a project-configured medium-voltage switchgear platform. The model name alone does not define the final panel rating, internal-arc classification, service-continuity category, breaker duty, relay functions, or cable interface. EPC contractors and industrial buyers should confirm the system study and panel schedule before treating a catalogue value as an order requirement.

Minimum RFQ inputs

Input	Why it matters
System voltage and frequency	Defines insulation coordination and component selection.
Continuous current and bus arrangement	Defines incomer, bus-section and feeder ratings.
Maximum short-circuit current and duration	Defines breaker interruption duty and assembly withstand requirements.
Single-line diagram and feeder list	Defines panel functions, interlocking, metering and protection.
CT, VT and relay requirements	Defines ratios, classes, burdens, protection functions and communications.
Cable or busduct interface	Defines termination direction, compartment layout and phase spacing.
Service conditions	Altitude, ambient temperature, humidity, pollution and indoor/outdoor duty can change the design.
Required standards and evidence	Separates project requirements from evidence already available for a tested configuration.

International standard framework

IEC 62271-200:2021+AMD1:2024 covers prefabricated AC metal-enclosed switchgear above 1 kV and up to 52 kV. IEC 62271-1:2017+AMD1:2021 provides common specifications for AC switchgear above 1 kV. A project that calls for these standards still needs an agreed technical schedule stating the required ratings, classifications, tests, and document package.

The KYN28A designation is widely used in China, but it is not a substitute for an IEC classification or a project-specific compliance schedule. Ask the supplier to map every tender requirement to a drawing, datasheet, routine test, type-test report, or declared exception.

Verified report scope: 2025XHT04078

ZY POWER publishes test report 2025XHT04078 for the submitted KYN28A-12/1250-31.5 sample. The report identifies Zhejiang Zhongyong Electrical Equipment Co., Ltd. as the client, manufacturer, and production unit.

The report states that testing was performed to GB/T 11022-2020 and GB/T 3906-2020. Its conclusion covers four items:

1. Power-frequency voltage test.
2. Lightning impulse voltage test.
3. Insulation test of auxiliary and control circuits.
4. Insulation test of non-metallic partitions and shutters.

Evidence boundary: this report must not be used as proof of temperature-rise, short-circuit withstand, internal-arc classification, mechanical endurance, IP degree, or full IEC 62271-200 compliance. Those claims require separate applicable evidence for the offered configuration.

Documents to request before approval

• Approved general arrangement and foundation drawing.
• Single-line diagram, schematic and terminal plan.
• Breaker, CT, VT, relay and auxiliary-component datasheets.
• Interlocking matrix and operating sequence.
• Routine test plan and final routine test report.
• Applicable type-test evidence with a written assessment of configuration relevance.
• English nameplate, packing list, manuals and project document index.

Selection workflow

1. Freeze the system study inputs and panel schedule.
2. Issue the required standards, ratings and classifications in the RFQ.
3. Review the proposed configuration and deviations line by line.
4. Confirm whether each evidence document applies to the offered panel.
5. Approve drawings before production.
6. Review routine test records and shipping documents before release.

Related product and downloads

• KYN28A-12 product series
• KYN28A-12 English datasheet
• Test report 2025XHT04078

FAQ

Does report 2025XHT04078 prove a 31.5 kA short-circuit test?

No. The model string includes 31.5, but the published report conclusion covers four insulation-related tests. Short-circuit withstand must be supported by separate applicable evidence.

Can an IEC requirement be met with a GB/T report?

Do not assume equivalence. The buyer or appointed engineer should compare the specified IEC clauses, the cited GB/T edition, the test scope, and the offered configuration before accepting the evidence.

What is the fastest way to obtain a reviewable quotation?

Send the single-line diagram, panel schedule, system voltage, fault level, protection philosophy, CT/VT requirements, destination, quantity, and required document list.