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40.5kV Solid Insulated Switchgear/RMU


Applicable to power supply system of rated voltage of 35kV, AC 50Hz, and also used for terminal power supply, or equipped in box-type transformer substation, or for control and protection device of electrical energy. Technical specifications comply with the provisions of IEC298. Application fields include power grid, factory distribution, high voltage transmission, railway system, urban power distribution, wind power generation, etc.


40.5kV Solid Insulated Switchgear.pdf


Product Advantages

Solid Insulation

Shielded layer of conductive material makes the surface at earth potential everywhere; it is accidently touchable providing safety features for operator.

This shielded solid insulated switchgear, which is completely solid insulated, has entire circuit insulated by epoxy and silicon rubber, leaves no live parts in free air; given switchgear less affection of dirt, humidity and pollutions etc.; requires less necessity for maintenance. Each phase is selfcontained into single epoxy block, significantly reducing phase to phase discharge and risks of internal arc fault.

Modular architecture

Modular architecture enables reduction of switchgear dimensions

Dimensions of Solid Insulated Switchgear : 700 × 2000 × 1150 it is only 1/6 of traditional air insulated type ie KYN61.

Optimized Electric Field

Computing technology facilitate optimal design of electric field and isolation.


Sealed electrified body IP67.

Inner cone cable terminal to improve the connection reliability

Extreme Environment Application

Suitable for cold, high altitude, humidity, corrosion, lowland and explosion-proof area.

All Operating Condition Environment

Ambient temperature: -50 ℃ ~ +70 ℃ ;

Altitude: ≤ 5500 m

Internal and external arcing test report (switches, bus bar, cable compartment) detection

Immersion detection test report

Salt spray testing report

The circuit breaker is composed of mechanism transmission box and circuit breaker poles.



Earthing / Disconnecting Switch Assembly There are three internal cone socket in the poles, among which the 2# cone is used for installing lightning arrester, and the two 3# cone are used for connecting 630A cables.

Unit Module V

Vacuum Circuit Breaker Disconnecting Switch
Earthing Switch
Rated Voltage kV 40.5 40.5 40.5
Arc Quenching

Rated Current A 1250 1250 1250
Rated Frequency Hz 50/60 50/60 50/60
Main Circuit Resistance μΩ ≤120 ≤120 ≤120
Power Frequency Withstand Voltage(1 min) kV 118 118 118
Lightning Impulse Withstand Voltage kV 215 215 215
Rated Short Circuit Breaking Current kA 31.5

Breaking times Times 30

Rated Short Circuit Making Current kA 80

Rated Short Time Withstand Current/Duration kA/s 31.5/4s 31.5/4s 31.5/4s
Rated Peak Withstand Current kA 80 80 80
Internal Arcing Test (AFLR level) kA/s 31.5kA/0.5s (including bus compartment, switch compartment, cable compartment)
Degree of Protection
IP67 IP67 IP67
Mechanical Endurance Times 10000 3000 3000