A 24 kV KYN28 switchgear enquiry is not complete when the model name is on the datasheet. The buyer must define the 24 kV system and insulation basis, continuous and fault duties, the exact circuit-breaker and protection scheme, the four compartment interfaces, and the room and cable conditions. CANGO’s KYN28-24 page publishes a range of values; it does not establish that every combination is a valid or tested configuration.
This guide is for project buyers, EPC teams, electrical contractors and consulting engineers who need to turn a family name into a reviewable package. It is a buyer-side coordination aid, not project engineering, protection-setting, switching, commissioning or approval authority. Final selection remains with the responsible engineers and the accepted project documents.
What KYN28-24 identifies
CANGO’s model explanation gives KYN28-24 the following code:
| Code element | Published meaning | What remains open |
|---|---|---|
| K | Armored switchgear | Exact enclosure construction, partitions and applicable classifications |
| Y | Removable type | Breaker truck, handling arrangement and interface compatibility |
| N | Indoor type | Room layout, environmental conditions and access provisions |
| 28 | Design serial number | The detailed general arrangement and ordered circuit configuration |
| 24 | Rated-voltage class | Maximum system voltage, insulation basis and project standards |
The model-meaning graphic also shows (Z) for a vacuum circuit breaker, but the product page explicitly asks the buyer to confirm the selected vacuum circuit breaker and ordered circuit configuration. The family code is therefore an entry point, not a substitute for the single-line diagram and equipment schedule.
CANGO describes KYN28-24 as armored removable AC metal-enclosed switchgear for receiving, distributing, controlling, protecting and monitoring three-phase AC circuits. The page presents it for indoor medium-voltage distribution systems and distribution rooms that require removable switchgear, with final selection based on rated data, drawings and site conditions. Those are useful first-party application statements, not a project-specific certification or a guarantee of suitability. CANGO KYN28-24 product information
Start with the 24 kV system and insulation basis
The equipment rated voltage and the nominal system voltage are not the same entry. A project may use a nominal voltage below 24 kV and still require a 24 kV-class assembly, or it may have operating, earthing and insulation conditions that require a different review. The project specification must establish:
- Nominal and maximum system voltage.
- Rated frequency and the applicable operating states.
- Earthing arrangement and insulation-coordination basis.
- The project’s required standard editions and national deviations.
- Altitude, ambient temperature, humidity, condensation, contamination and any other declared service conditions.
- The room location and the expected access, maintenance and replacement approach.
CANGO’s KYN28-24 page lists 24 kV and 50 Hz. It does not state a 60 Hz offering on the checked page. Do not assume that a 60 Hz project can use the same configuration without written confirmation.
IEC 62271-200:2021 is the official publication for prefabricated AC metal-enclosed switchgear and controlgear assemblies above 1 kV through 52 kV, at service frequencies up to 60 Hz and for indoor or outdoor installation. Its public scope page identifies the consolidated 2021 version with the 2024 amendment. That scope helps frame the equipment class; it does not prove that a particular CANGO arrangement, rating combination or project installation complies with every applicable requirement. IEC 62271-200 publication information
Read the KYN28-24 rating schedule as a linked set
The CANGO page publishes a useful screening table. Use it to ask better questions, not to approve a combination by matching one row.
| Published entry | CANGO KYN28-24 page | Buyer check |
|---|---|---|
| Rated voltage | 24 kV | Maximum system voltage, insulation basis, earthing and project standard |
| Rated frequency | 50 Hz | Confirm the project frequency; no 60 Hz claim is made on the checked page |
| Rated current of circuit breaker and switchgear | 630, 1250, 1600, 2000, 2500, 3150 and 4000 A | Normal and contingency load, ambient conditions, busbar arrangement and exact circuit schedule |
| Row labeled “Rated dynamic stability current (4s)” | 16, 20, 25, 31.5, 40 and 50 kA | Fault-current magnitude, duration and the exact assembly evidence; ask for the controlled rating schedule |
| Rated stability current, peak value | 40, 50, 63, 80, 100 and 125 kA | Peak fault duty and the offered assembly configuration |
| Rated short-circuit breaking current | 16, 20, 25, 31.5, 40 and 50 kA | Exact breaker model, breaking duty and coordination with the upstream and downstream protection |
| Rated short-circuit closing current, peak value | 40, 50, 63, 80, 100 and 125 kA | Breaker making duty and the project fault study |
| One-minute power-frequency withstand | 65 kV between poles/pole to ground; 79 kV between breaks | The exact insulation schedule, system earthing and applicable project standard |
| Lightning impulse withstand, peak | 125 kV between poles, pole to ground and break; 145 kV between breaks | The exact pairing and evidence for the ordered configuration |
| Protection level | Housing IP4X; isolation room and circuit-breaker room door open IP2X | The actual operating/access state and any additional environmental requirement |
The page labels one row “rated dynamic stability current (4s)” and a separate row “rated stability current (peak value).” Do not silently translate those labels into a different assembly rating or treat the four-second row as a peak-withstand value. Ask the supplier to provide the controlled schedule that identifies the basis, duration, units and exact configuration for the proposed offer. The page also notes that the short-circuit capacity of the current transformer is considered separately; that is another reason not to reduce the whole offer to one fault number.
The current and fault ranges are not a recommendation. A high current option does not automatically suit a high-load feeder, and a high breaking rating does not prove that the complete assembly, CT/VT arrangement, cable termination or protection scheme is coordinated. Use the project load flow and fault study to define the duty, then obtain the matching configuration evidence.
Map the four documented compartment interfaces
CANGO’s structure drawing identifies four functional rooms. The drawing is useful because it turns the family name into interfaces that can be discussed with the civil, cable, protection and operations teams.
| Documented room | Interface to define | Evidence to request |
|---|---|---|
| Busbar room | Lineup current, busbar arrangement, section continuity, future extension and the interface between adjacent panels | Busbar schedule, joint/connection details, partition arrangement and applicable ratings for the offered lineup |
| Breaker trolley room | Exact breaker, withdrawable unit, primary and secondary contacts, position indication, interlocks and handling method | Breaker model, truck compatibility, mechanism data, interlock schedule and operating/access information |
| Cable room | Cable entry direction, number and type of cables, terminations, supports, earthing and any specified surge-arresting provision | Cable-entry and termination drawing, available termination envelope, earthing interface and installation requirements |
| Relay instrument room | CT/VT interfaces, protection and metering devices, terminal blocks, control power and communications | Device schedule, CT/VT data, terminal and wiring schedule, auxiliary supply requirements and communication interface |
The room names do not prove that every illustrated component is included in a particular offer. The exact configuration drawing, bill of materials and component schedules decide that. A withdrawable breaker from another KYN28 family or rating is not automatically interchangeable: the mechanical fit, primary contacts, secondary connections, earthing and interlocks all require a compatibility review.
Specify the breaker, CT/VT, protection and earthing together
The breaker is one component inside the assembly, not a substitute for the assembly specification. Obtain the exact circuit-breaker model, its making and breaking duties, operating mechanism, trip and closing circuits, auxiliary contacts, mechanical endurance information and the requirements for the withdrawable unit. Confirm that the selected breaker is compatible with the KYN28-24 truck, primary contacts, secondary plug and interlocks.
IEC 62271-100:2021 covers three-phase AC circuit-breakers for indoor or outdoor installation at 50 Hz and/or 60 Hz on systems above 1,000 V. The publication page identifies the consolidated 2021 version with the 2024 amendment. This is a scope reference, not a statement that a CANGO breaker has a particular rating or test result. IEC 62271-100 publication information
Current and voltage transformers need their own schedule. Define the ratio, accuracy class, burden, short-time current capability, location, polarity and wiring requirements. The assembly’s current rating does not automatically establish the CT duty, and the breaker’s breaking rating does not establish the VT or protection performance. Our guides to current-transformer selection and voltage-transformer selection explain the inputs that belong in those separate reviews.
Protection settings remain a project-engineering responsibility. The switchgear supplier may provide relays, test terminals, wiring, CT/VT interfaces and a requested communication protocol, but the protection functions and settings must follow the approved protection study and operating philosophy. Ask for the device schedule, terminal schedule and the boundary between supplier-configured and project-configured functions.
Earthing and interlocks must be described as a scheme, not implied by the word “withdrawable.” Confirm the earthing-switch arrangement, cable-test and earthing points, operating sequence, lock and key provisions, position indications and the responsibility for proving dead before work. The earthing-switch functions and interlocks guide covers the review questions; it does not authorize a switching procedure.
Control power and communications belong on the same interface schedule. Identify the auxiliary supply, trip and closing supplies, battery or charger boundary, changeover behavior, relay and meter protocols, event recording, time synchronization and the signals that must reach the plant control system. If these items are left to the end of the order, the power equipment may be mechanically complete while the operating scheme remains unresolved.
Plan the room, cable and service access before freezing the lineup
KYN28-24 is described by CANGO as an indoor type. The room review therefore needs the actual KYN28-24 general arrangement, not a dimension copied from a 12 kV panel or another supplier’s KYN28 drawing. Check:
- Front operating and inspection space, plus any rear access required by the selected design.
- Movement and lifting of the withdrawable breaker unit.
- Door swing, panel removal, cable entry and termination access.
- Transport, delivery and replacement routes into the room.
- Pressure-relief or exhaust provisions where the selected design requires them.
- Cable bending, support, sealing and earthing arrangements.
- Space for future panels and the busbar interface at the extension end.
- Environmental protection, condensation control and maintenance access for the actual site.
IEC 61936-1:2021 provides requirements for the design and erection of electrical power installations above 1 kV AC, while its public scope states that it does not apply to the design of prefabricated, type-tested switchgear or high-voltage/low-voltage prefabricated substations. The practical implication is that the assembly documentation and the installation design are separate deliverables that must be coordinated. IEC 61936-1 publication information
The UK Health and Safety Executive’s HSG230, second edition, is aimed at owners and operators of industrial and commercial switchgear and covers selection, use, operation, maintenance, assessment of aged equipment and replacement or refurbishment. Its scope is three-phase AC switchgear from 1 kV through 33 kV and it is written for Great Britain. It is useful evidence for treating room access, maintenance and replacement as part of the buying decision; it is not a global clearance rule or a substitute for the project’s standards. HSE HSG230
Do not treat 24 kV as a simple step-up from 12 kV
The existing CANGO article on 12 kV KYN28 switchgear owns the KYN28-12 rating and compartment task. This article does not repeat its 12 kV schedule or its worked 11 kV example. For a 24 kV project, use the KYN28-24 product page, the 24 kV drawings and the project’s own system study.
Do not copy the following from a 12 kV package:
- Insulation values or the equipment voltage designation.
- Busbar, breaker, CT/VT or fault-duty combinations.
- Cabinet dimensions, truck interchangeability or room spacing.
- Cable termination arrangements and cable-entry assumptions.
- Protection functions, settings or operating interlocks.
- Test evidence, classification or certification statements.
The equipment class and the project design must be checked together. A model name with a “24” in it is not evidence that the exact assembly meets the maximum system voltage, insulation coordination, fault duration, environmental conditions or installation requirements of a particular project. Use the medium-voltage switchgear selection guide for family orientation and the metal-clad versus metal-enclosed comparison for construction terminology, then return to the exact 24 kV offer for the decision.
Where KYN28-24 can fit
The live CANGO product page supports a conditional fit: KYN28-24 can be considered for indoor medium-voltage distribution rooms that require removable switchgear, where the project needs a 24 kV-class metal-enclosed assembly and the published data can be matched to the actual system and site conditions.
That statement is deliberately narrow. It does not establish that the model is suitable for every 24 kV system, every utility network, every protection scheme or every environment. The medium-voltage switchgear category shows the wider CANGO range, and the KYN28-24 product page is the first-party source for the published model data. The final offer must identify the exact breaker, current and fault schedule, compartment arrangement, CT/VT devices, protection and control interfaces, cable terminations and installation drawings.
Build the 24 kV RFQ package
A comparable quotation starts with a coordinated input package. Use the table below as a checklist and mark unresolved items rather than filling them with assumptions.
| RFQ input | What to provide | What to request in return |
|---|---|---|
| Project basis | Site location, indoor room conditions, project stage, applicable standards and approval process | Applicable standard editions, assumptions and exclusions |
| Single-line diagram | Incoming, outgoing, bus-section, transformer and spare circuits, with CT/VT and protective devices | Panel-by-panel primary scheme and offered component schedule |
| System data | Nominal and maximum voltage, frequency, earthing and insulation basis | Configuration-specific rated voltage, frequency and insulation values |
| Load and fault study | Normal and contingency current, prospective fault current, duration and peak duty | Continuous, short-time, peak and breaker-duty evidence for the offered configuration |
| Breaker data | Required breaking, making, operating mechanism, control voltage and interlocks | Exact breaker model, ratings, accessories and compatibility with the KYN28-24 truck |
| CT/VT and protection | Ratios, classes, burdens, short-time duty, relay functions, metering and communication | Instrument schedules, terminal schedules, device list and responsibility matrix |
| Cable and termination data | Cable type, number, size, entry direction, termination, support and earthing requirements | Cable-room arrangement, termination envelope and installation requirements |
| Room and access | General arrangement, front and rear access, handling route, future extension and replacement plan | KYN28-24 general arrangement, loading data, door swing and installation requirements |
| Environment | Ambient, altitude, humidity, condensation, contamination, seismic or other site conditions | Applicable environmental provisions and evidence for the offered configuration |
| Documentation and commercial scope | Required drawings, test documents, instructions, spares, inspection and commissioning support | Drawing/document list, supply boundary, exclusions and inspection plan |
Use the single-line-diagram guide to make the circuit functions legible before the enquiry, and the medium-voltage switchgear quotation checklist to keep the commercial and technical scopes aligned. Neither replaces the KYN28-24 configuration drawing or the project protection study.
Send the single-line diagram, panel schedule, system and fault data, breaker and protection requirements, cable and room drawings, environmental conditions and required standards to CANGO for a KYN28-24 configuration review. State which items are confirmed, which are provisional and who owns each open interface. That is the difference between a useful equipment quotation and a price for a family name.
References
- CANGO – KYN28-24 24kV Metal-Clad Switchgear, first-party product information and structure drawing; checked 2026-11-03.
- IEC – IEC 62271-200:2021, official publication and scope information; the page identifies the consolidated 2021+AMD1:2024 version.
- IEC – IEC 62271-100:2021, official publication and scope information; the page identifies the consolidated 2021+AMD1:2024 version.
- IEC – IEC 61936-1:2021, official publication and scope information.
- UK Health and Safety Executive – Keeping electrical switchgear safe, HSG230, second edition, 2015; Great Britain guidance.
