KYN61-40.5 Armored Withdrawable Switchgear
The KYN61-40.5 armored withdrawable switchgear is manufactured by LYE Technology for indoor 40.5 kV distribution, rated 42 kV power-frequency withstand, 75 kV lightning impulse withstand and 40.5 kA short-circuit breaking current. The withdrawable truck lets a faulted breaker be replaced while the busbar stays live.
- Rated voltage and frequency: 40.5 kV, 50 Hz
- Rated current: Up to 4000 A
- Lightning impulse withstand: 75 kV peak
- Short-circuit breaking current: 40.5 kA, making current 100 kA
- Degree of protection: IP4X enclosure, IP2X between compartments
Armored Withdrawable Switchgear: Key Features & Typical Use
Withdrawable Protection at 40.5 kV
At medium voltage the consequences of a long outage are larger and the cost of a spare breaker is proportionally smaller, which is exactly why a withdrawable architecture pays for itself here. The KYN61-40.5 allows the circuit-breaker to be racked out and replaced without de-energising the busbar, so the rest of the substation continues to supply load.Specified Insulation Margins
The cabinet is rated 40.5 kV at 50 Hz with a 42 kV one-minute power-frequency withstand and a 75 kV peak lightning impulse withstand. Creepage distances are at least 216 mm for porcelain and 240 mm for organic insulation, phase clearances are at least 125 mm, and partial discharge is not more than 3 pC per insulation component for a measurable condition baseline.Fault Containment by Construction
Short-circuit breaking current is 40.5 kA with 100 kA making current and 40 kA for four seconds short-time withstand, and internal arc duration is limited to one second. Enclosure protection is IP4X with IP2X between compartments, so a fault inside one compartment is prevented from propagating through the board.Precise Sheet Metal, Rigid Frame
The main frame side panels are produced by CNC multiple-bending and bolted into the assembly, giving high component accuracy and strength which translates into overall switchgear precision and stability. The cabinet occupies a 600–1000 mm width, 1450–1750 mm depth and 2240 mm height envelope for indoor installation at altitudes up to 1000 m.Armored Withdrawable Switchgear Specifications & Technical Data
| Parameter | Details |
|---|---|
| Product | KYN61-40.5 armored withdrawable AC metal-enclosed switchgear |
| Structure type | Armored, withdrawable indoor AC metal-enclosed switchgear |
| Rated voltage | 40.5 kV |
| Rated frequency | 50 Hz |
| Rated current | Up to 4000 A |
| Rated power-frequency withstand voltage (1 min) | 42 kV |
| Rated lightning impulse withstand voltage (peak) | 75 kV |
| Rated short-circuit breaking current | 40.5 kA |
| Rated short-circuit making current | 100 kA |
| Rated short-time withstand current and duration | 40 kA / 4 s |
| Rated peak withstand current | 100 kA |
| Auxiliary and control circuit withstand voltage | 2 kV |
| Enclosure degree of protection | IP4X |
| Protection between compartments | IP2X |
| Creepage distance, porcelain (to earth) | At least 216 mm |
| Creepage distance, organic material (to earth) | At least 240 mm |
| Air clearance, phase-to-phase and phase-to-earth | At least 125 mm |
| Partial discharge, per insulation component | Not more than 3 pC |
| Loss of service continuity category | LSC2 |
| Cooling method | Self-cooling; forced air cooling above 3150 A |
| Internal arc allowable duration | 1 s |
| Cabinet dimensions | Width 600–1000 mm, depth 1450–1750 mm, height 2240 mm |
| Installation environment | Indoor, altitude not above 1000 m |
KYN61-40.5 — Withdrawable Medium-Voltage Switchgear for 40.5 kV Networks
At 40.5 kV, the cost of an unplanned outage is usually measured in hours of lost production or lost supply rather than in repair parts. The KYN61-40.5 is designed around that reality: an armored withdrawable cabinet where the breaker truck can be removed and replaced while the busbar stays live and the rest of the board keeps working.Specifications usually call this equipment 40.5 kV armored withdrawable switchgear, a KYN61 medium-voltage panel or a 35 kV metal-clad switchgear cubicle, and it is compared with gas-insulated switchgear on the same shortlist. At this voltage class the cost of an unplanned outage is what drives the decision, so the questions worth putting to any manufacturer are the arc duration, the separation form and the spare truck availability.Electrically the cabinet is rated 40.5 kV at 50 Hz with currents up to 4000 A, a 42 kV one-minute power-frequency withstand, a 75 kV peak lightning impulse withstand, 40.5 kA short-circuit breaking current and 100 kA making current. Partial discharge is not more than 3 pC per insulation component, and internal arc duration is limited to one second.The frame is built from CNC multiple-folded side panels bolted into a rigid assembly, which keeps a long cubicle run aligned and the busbar joints consistent. The cabinet fits a 600–1000 mm width, 1450–1750 mm depth and 2240 mm height envelope and is supplied for indoor installation at altitudes up to 1000 m.Factory-Direct Armored Withdrawable Switchgear Manufacturer & OEM / ODM
We Manufacture, You Brand
LYE Technology (Zhejiang) Co., Ltd. is a national high-tech enterprise and manufacturer in Wenzhou, China: sheet-metal fabrication, welding, powder coating, busbar machining and final assembly run on our own factory lines, and every unit is function-tested before it leaves the works. A KYN61-40.5 Armored Withdrawable Switchgear that reaches your site carries the routine test behind it, not just the rating on the nameplate.We are one of the Top 10 Brands of China's small power distribution boxes and a drafter of national standards in this category, and we hold ISO9001, ISO14001, ISO45001, CCC, CE and TUV certification. Because we are the manufacturer rather than a trading company, our sales engineers quote from your drawing in factory-direct terms, and OEM or ODM work is produced on the same lines as our standard products.For the KYN61-40.5 we build the main frame from CNC folded panels in our own works, so a project-specific busbar or protection arrangement is resolved on the drawing rather than on site.- OEM branding — custom colours, laser marking and your own project or retail packaging, applied at the factory.
- ODM options — ratings, configurations and internal layouts built around your drawings or single-line diagram.
- Certification — ISO9001, ISO14001, ISO45001, CCC, CE and TUV, with test documents supplied per project.
- MOQ — flexible quantities for a project or a trial order, with mixed types welcome in one shipment.
KYN61-40.5 withdrawable truck with the door open
Armored compartment barrier between busbar and cable rooms
Armored Withdrawable Switchgear Buying Guide from the Manufacturer
Medium-voltage switchboards are specified against the network study and the substation layout. These are the points we confirm before drawings are released.
- Confirm the rated voltage of 40.5 kV, frequency, rated current and the short-circuit level from your network study.
- Set the busbar arrangement and the number of incoming, outgoing and bus-tie cubicles required.
- Check the room against the 600–1000 mm width, 1450–1750 mm depth and 2240 mm height envelope.
- Confirm cable termination method, cable entry direction and the protection and metering scheme.
- Send the single-line diagram, room drawing and site altitude and ambient conditions.
- Approve drawings, then production with routine and partial-discharge testing before shipment.
Manufacturer & Sales Support for Wholesale Buyers
OEM / ODM
Learn more →Factory colours · Logo marking · Custom layout
Wholesale
Learn more →Factory pricing · Flexible MOQ · Global shipping
Distributor Support
Learn more →Account manager · Drawing support · Priority lead times
Specifying a 40.5 kV Withdrawable Switchboard?
OEM/ODM, wholesale pricing and distributor support straight from the manufacturer — one enquiry gets you a factory-direct quotation for the KYN61-40.5 Armored Withdrawable Switchgear, sized to your single-line diagram, substation room drawing and network short-circuit study results, with type-test documentation under the applicable standards for 40.5 kV indoor AC metal-enclosed switchgear. Our sales team replies with a specification and an indicative price, so send your drawings and quantity.Contact Our Sales TeamArmored Withdrawable Switchgear — Frequently Asked Questions
What is 40.5 kV armored withdrawable switchgear?
It is an indoor medium-voltage switchgear cabinet in which the circuit-breaker is mounted on a withdrawable truck inside an armored metal enclosure, used to receive and distribute electrical energy at 40.5 kV with control, protection and detection functions. The KYN61-40.5 is rated 42 kV for one minute power-frequency withstand, 75 kV peak lightning impulse withstand and 40.5 kA short-circuit breaking current.What is armored switchgear used for?
It is used in power plants, substations and industrial installations at 40.5 kV where the supply has to keep running while equipment is maintained. Because the breaker truck can be racked out and replaced with the busbar energised, spare trucks can be held on site so a faulted breaker is substituted rather than repaired, which is the main reason this architecture is chosen at medium voltage.What is the difference between 12 kV and 40.5 kV switchgear?
The difference is the voltage class and everything that follows from it: insulation clearances, creepage distances, the impulse withstand level and the physical size of the cubicle. A 12 kV cabinet is rated for 42 kV one-minute power-frequency withstand with at least 125 mm air clearance, while a 40.5 kV cabinet carries the same withstand figure but at a higher system voltage, plus a higher short-circuit breaking current.Who are the main medium-voltage switchgear manufacturers?
The market includes international brands and a substantial group of Chinese manufacturers building to the same standards, so identical ratings can be delivered at quite different levels of build quality. Ask how the frame is fabricated, what the guaranteed partial-discharge figure is per insulation component, and whether spare breaker trucks and type-test documentation are available. LYE manufactures the KYN61-40.5 in Wenzhou and holds ISO9001, ISO14001, ISO45001, CCC, CE and TUV certification.How much does 40.5 kV switchgear cost?
Indicative factory-direct pricing is roughly US$3,000 to US$20,000 per cubicle or unit, depending on the rated current, the busbar arrangement, the number of incoming, outgoing and bus-tie cubicles, the protection scheme and the quantity ordered. Because the board is priced from a cubicle schedule, the single-line diagram and the substation room drawing are the two documents that turn an indicative band into a firm quotation.
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Use a distribution box for final circuits and compact branch protection; use a cabinet when the project needs larger incoming capacity, more feeder groups, metering, busbars or greater internal separation. The final choice should be checked against the single-line diagram, device list, available installation space and local project rules.
Provide the device schedule, circuit quantity, component dimensions, cable-entry direction, mounting method and required spare capacity. LYE also reviews door clearance, bending radius, heat-producing devices and the usable depth behind the mounting plate before confirming an enclosure size.
Start with the actual exposure to dust, rain, cleaning water and accidental contact rather than choosing the highest number by default. Cable entries, ventilation, door seals and installation workmanship affect the finished assembly, so the target rating and verification basis must be confirmed for the specific product and project.
Coated or galvanized steel is commonly considered for general indoor service, stainless steel for humid or corrosive locations, and engineering plastic for lightweight non-metallic applications. Material grade, thickness, UV exposure, chemical contact and earthing requirements must be confirmed against the installation environment.
Share the component heat load, ambient temperature, solar exposure, duty cycle and allowable internal temperature. LYE can then review enclosure volume, spacing, ventilation or fan provisions, sun shields, heaters or drainage details; the final thermal design remains tied to the installed equipment and site conditions.
Yes. A dimensioned drawing is preferred, but a physical sample and clear reference photographs can also start the review. Material, thickness, openings, hardware, finish, labels, inspection points and packing are recorded before sampling or repeat production.
PDF and common 2D CAD drawings are suitable for most enclosure enquiries, while 3D files can help with complex assemblies. Include a revision number, units, tolerances and component references; file compatibility and any missing production information will be confirmed during review.
A sample or first article can be arranged for a new or customized product. The approval plan should identify dimensions, openings, fit, appearance, hardware, labels and packaging, together with the sample cost and timing agreed for the actual order.
Available documents may include approved drawings, packing lists, dimensional or appearance inspection records, product data and certificates applicable to the confirmed model. Destination-specific declarations or third-party testing must be requested before order placement so availability and scope can be verified.
Lead time is confirmed after the product scope, quantity, sample requirement and finish are known. Packing is reviewed against product weight, surface protection, destination and shipping method; if an issue is found after delivery, send the order reference, label, photographs and quantity affected so it can be traced and reviewed.
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