KYN44A-40.5 high voltage switchgear

KYN44A-40.5 armored removable AC metal-enclosed switchgear is suitable for three-phase AC 50Hz/60Hz, 40.5kV single bus and single bus segmented power system, mainly used in power plants, substations, industrial and mining enterprises, high-rise buildings, etc. It is used for receiving and distributing 35kV network electric energy in power transformation and distribution, and controls, protects and monitors the circuit. It meets the requirements of IEC60298, GB3906, DL404 and other standards, and has a complete "five prevention" function.

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    30 days
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It meets the requirements of the "State Grid Corporation's Eighteen Major Anti-accident Measures for the Power Grid", the air gap between all conductors and the ground is ≥300mm, and no insulating plates are used in the high voltage switchgear.

The cable room adopts a new type of ground knife operating rod downward movement structure independently developed by our company, which can not only ensure the reliability of mechanical interlocking, but also maximize the air clearance between the conductors in the cable room and the ground, and ensure that the C-phase charged body electrical Air distance reaches 300mm.

By adopting the "temperature contrast type" temperature and humidity controller to control the heating load, the temperature in the switch cabinet is always higher than the room temperature outside the switch cabinet, achieving the effect of active anti-condensation.

Explosion-proof lock points are added to the circuit breaker door, cable room door and cable room lighting lamp shade respectively to increase operational safety.

Has a number of patents, equipped with the VB5 (ZN21D) series circuit breaker independently developed by our company.






Rated Voltage




Rated frequency




Rated current of Main bus




Rated current of branch bus




Rated insulation level

1min Power frequency withstand voltage (effective value)


95(Phase to phase、phase to earth)

115(Isolating distance)

Lightning impulse withstand voltage (peak)

185(Phase to phase、phase to earth)

215(Isolating distance)

assistant control circuit 1min Power frequency withstand voltage




Rated short-circuit breaking current




 Rated short-circuit making current(peak)




Rated short-time withstand current(4s)




Rated peak withstand current




Rated voltage of assistant control circuit


AC/DC 110、220


IP grade

outer shell: IP4X

between the compartment: IP2X




1400(1200)×3300×2600(High current overhead option)

1400(1200)×3100×2600(overhead option)





About 2300

The Altitude

≤1000 meter

Ambient Air Temperature

upper limit +40℃, lower limit -25℃

The Relative Humidity of the Surrounding Air

the daily average value is not more than 95%, and the monthly average value is not more than 90%.

In order to ensure the insulation performance of the switchgear, the ambient humidity should be properly controlled

Earthquake Intensity

≤8 degree

The Inclination of the Ground


There is no danger of fire and explosion, no severely polluted places such as severe vibration and chemical corrosion.

Note:When the working environment conditions are different from the above regulations, the user can negotiate with us.

Q: Are you the high voltage switchgear manufacturer or trader?

A: We are both manufacturer & trader. We have our own manufacturer named TIANYI TONGYI ELECTRIC CO.,LTD, who have 27 years experience in electric industry. It covers an totally area of 117,000 m2 with 300 employees, also is a qualified supplier of China National Nuclear Corporation(CNNC) and main supplier for State Grid & China Southern Power Grid.

Q: What is your after-sales service?

A: We always provide free online service and technical support within 24 hours. 18 months warranty for customers.

Q: What is your delivery time?

A: Normally 25~35days. It depends on the order quantity and season. We have very strong capacity to produce top quality products, please inquiry us if you have any questions.

Q: What is the quality warranty time?

A: We have quality certificate CCC, CQC, ISO9001, CE ... Meanwhile, we can provide 18 months warranty for our products. Free online service and technical support within 24 hours is always provided to our customers.

Q: Do you accept ODM and OEM high voltage switchgear?

A: Yes. We have professional R & D teams to update and develop the latest technology. We also can support ODM or OEM, please send us details drawing to discuss.

Q: What is your payment terms?

A: Generally there are two payment terms:

a) 30% advance payment via T/T as a deposit, balance 70% against the shipping documents

b) Irrevocable L/C at sight

Q: If I want to visit you, how to go?

A: Our factory is located in Luoyuan County, Fuzhou City. Details address is Songshan Area, Taiwan Investment Zone, Luoyuan County, Fuzhou City, Fujian Province,China.

a) The nearest airport is Fuzhou Airport, if you come by air, please arrive in Fuzhou Airport, it takes 1 hour from the airport to our factory

b) The nearest train station is Luoyuan Station, if you come by train, please arrive in Luoyuan Station, it takes only 5 minutes to our factory.

Anyway, please contact us in advance, we will send the car to the airport or train station to pick you up.Sincerely welcome you to come and visit us.

Q: Do you need high voltage switchgear agents?

A: Yes, we welcome you to be a partner. Welcome to contact us for more information.

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