TRANSFORMERS & ELECTRICAL COMPONENTS
APPLICATION / 01
Substation incoming and outgoing circuits
For power receiving and feeder distribution with a defined bus arrangement and protection scheme.
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Product illustration. Actual configuration varies by specification.
Open product image ↗Medium-voltage Switchgear
KYN28A-12 · Metal-clad withdrawable switchgear
Indoor metal-clad withdrawable switchgear for 12 kV-class distribution.
- Voltage designation
- 3.6 / 7.2 / 12 kV
- Selection
- Rated current, fault duty and circuit arrangement
- Rated current options
- 630 / 1,250 / 1,600 / 2,000 / 2,500 / 3,150 A
- Frequency
- 50 Hz
- Breaking current options
- 16 / 20 / 25 / 31.5 / 40 / 50 kA
Price on enquiry · Configuration, quantity & destination
Supply scope, manufacturer information, applicable documents and warranty arrangements are confirmed in the quotation and order.
APPLICATION & DUTY
Where KYN28A-12 fits
KYN28A-12 is indoor metal-clad withdrawable switchgear for distribution, protection and monitoring. The compartmented design separates busbars, breaker truck, cables and secondary instruments. Main-circuit rating and the actual load-switching duty are selected together.
APPLICATION / 02
Industrial motor and distribution feeders
For plant circuits where the load type and switching frequency form part of the selection, including motor duties requiring a specific review.
PRODUCT ENGINEERING
Construction & operating functions
DETAIL / 01
Four functional compartments
The arrangement separates the busbar, breaker-truck, cable and relay/instrument sections. This organisation helps identify the space and interfaces required for each part of the feeder.
DETAIL / 02
Truck and secondary connection
The breaker truck, shutter and secondary-plug arrangement are part of the withdrawable design. Matching these interfaces is essential for a replacement truck or breaker enquiry.
DETAIL / 03
Earthing and cable equipment
The construction drawing includes the earthing switch, cable terminations, current transformers and surge-protection location. The actual equipment list depends on the selected circuit.
DETAIL / 04
Pressure relief and heating
Pressure-relief and heating provisions are shown in the design. Room layout and auxiliary-supply requirements should accommodate the selected arrangement.
DETAIL / 05
Motor and capacitor duties
Motor and capacitor switching are duty-specific applications. Provide the load characteristics and required operating duty so the appropriate breaker and protective arrangement can be reviewed.
DEFINE THE SELECTED ASSEMBLY
Configuration & installation interfaces
Match the installation drawing, cable routes, clearances and electrical duty for the selected equipment.
Illustrative working scene- Electrical rating
- Select the voltage class, current, short-circuit breaking duty and withstand duty as a matched combination.
- Secondary scheme
- Provide CT/PT ratios, relay functions, trip/close voltage and remote-control requirements.
- Installation
- State cable-entry direction, cabinet-lineup and environmental requirements.
Installation & connection checklist
- Include cable termination sizes and required cable-room space.
- Provide extension-bus details for additions to an existing lineup.
- For repairs, send the full breaker reference, truck dimensions and secondary plug photos.
- Request the selected feeder’s primary and secondary diagrams.
Operating conditions for the listed configuration
- Indoor installation; altitude up to 1,000 m.
- Normal ambient range −15 to +40 °C. Special cold-climate configurations require separate agreement.
- Keep the installation free of significant corrosive or combustible contamination and severe vibration.
State any different ambient temperature, altitude, humidity, dust, salt or corrosive exposure when requesting the installation-specific configuration.
RATING DATA
Technical parameters
9Parameter / configuration entries
Units shownCompare values with their units
Selected variantConfirm the matching configuration
Review the listed configuration and applicable units. On a small screen, scroll the table sideways.
| Parameter | Catalogue value |
|---|---|
| Rated voltage options | 3.6 / 7.2 / 12 kV |
| Rated frequency | 50 Hz |
| Breaker and cabinet current options | 630 / 1,250 / 1,600 / 2,000 / 2,500 / 3,150 A |
| Short-circuit breaking current options | 16 / 20 / 25 / 31.5 / 40 / 50 kA |
| Short-time withstand (4 s) options | 16 / 20 / 25 / 31.5 / 40 / 50 kA |
| Peak withstand/making current options | 40 / 50 / 63 / 80 / 100 / 125 kA |
| 1 min power-frequency withstand by voltage class | 24 / 32 / 42 kV |
| Lightning impulse withstand by voltage class | 40 / 60 / 75 kV |
| Enclosure protection | IP4X; IP2X at compartments with the breaker door open |
Checked against original distribution catalogue PDF page 15. Insulation values correspond respectively to 3.6, 7.2 and 12 kV classes; select one complete rating combination. Ratings describe catalogue options, not every possible combination; select the complete configuration in the technical schedule.
Drawings & configuration documents
Send your selected rating and installation requirements to request the matching dimensional drawing, connection details and technical schedule.
DOCUMENTS · DELIVERY · SUPPORT
Technical coordination & after-sales enquiries
Confirm the order documents
Agree the selected specifications, applicable drawings, inspection records and identification requirements in the quotation and order.
Coordinate delivery
Include quantity, destination, packing requirements and preferred trade terms. Confirm transport scope and the requested delivery schedule with the quotation.
Request technical support
For an existing unit, provide its model, nameplate or order reference and a description of the issue. Include relevant photos or records already available. Warranty and service scope follow the agreed order terms.
Contact about this model ↗START WITH WHAT YOU HAVE
Prepare a quotation for this equipment.
Choose your enquiry type. Start with the information you have.
Price on enquiry
Quotations are prepared for the selected configuration, quantity and destination. Currency, validity, delivery terms, freight and any applicable duties or taxes are specified in the quotation.
Project procurement
New installations & project tenders
Discuss a project ↗What to prepare
Provide voltage, fault duty, circuit schedule and required protection scheme.
Distributor procurement
Model lists & repeat orders
Discuss supply requirements ↗What to prepare
List circuit configurations, ratings, preferred components and destination documentation needs.
Panel & equipment builders
Equipment integration & matching
Discuss an assembly ↗What to prepare
Send the line-up layout, bus interfaces, breaker specification and secondary wiring requirements.
Repair & replacement
Identify an existing unit or part
Identify a replacement ↗What to prepare
Provide the existing panel and breaker details, dimensions, plug connections and interlocks.
Illustrative enquiry scenarios.
Selection checklist for KYN28A-12
- System voltage, frequency, rated current and prospective fault level
- Bus arrangement and incoming/outgoing circuit schedule
- Breaker or load-switch duty, protection and control supply
- Cable terminations, room layout, access and expansion requirements
- Include cable termination sizes and required cable-room space.
- Provide extension-bus details for additions to an existing lineup.
- For repairs, send the full breaker reference, truck dimensions and secondary plug photos.
- Request the selected feeder’s primary and secondary diagrams.
From enquiry to an agreed supply
- Share the requirementModel, duty, quantity and destination.
- Review the configurationResolve ratings, interfaces and site conditions.
- Agree the technical scheduleScope, drawings, tests, price and delivery terms.
- Confirm delivery documentsAgree packing, identification and the applicable inspection records.
Testing, warranty terms and after-sales scope are to be agreed in the quotation and order documents for the selected configuration.
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Mingkong High & Low Voltage Switchgear Selection Guide · Updated 24 October 2026 · Chinese / English
For a quotation, include your required model, rating, quantity and operating conditions.