Medium Voltage Switchgear System
40.5kV ET2 AC Metal-enclosed Switchgear
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Eaton's range of SF6 free switchgear for Medium Voltage
Eaton Corporation is a worldwide leader in the design, manufacture, and sale of safe, reliable and high-performance medium voltage power distribution equipment in accordance with IEC, ANSI and GB / DL standards
Complete Global Medium Voltage Switchgear Solutions
Eaton, a premier leader in designing and manufacturing power distribution and protection equipment in the electrical industry, offers a comprehensive range of medium voltage (MV) solutions to meet the needs of virtually every application. From products that feature cutting-edge design that allow for easy access, maintenance and space savings, to arc-resistant products that enhance safety, Eaton's medium voltage solutions provide a variety of products for every need. Additionally, Eaton's global service network provides maximum customer support in all regions of the world.
As one of the few completely vertically integrated and diversified industrial manufacturers in the world, Eaton designs not only MV assemblies, but also the key components that comprise the MV solutions – from steel housing and circuit breaker compartments to vacuum interrupters, circuit breakers, bus systems and fuses.
Eaton's MV heritage, strengthened by acquisitions such as Westinghouse DCBU, Cutler Hammer, MEM and Holec, has resulted in breakthrough MV technologies and numerous international patents over the years.
Part of Eaton's complete electrical PowerChain Solutions – which help businesses minimize risks while realizing greater reliability, cost efficiencies, capital utilization and safety - Eaton's medium voltage equipment meets all applicable standards and certifications such as IEC, NEMA / ANSI, GB / DL, UL, IEEE, KEMA and CSA.
When it comes to medium voltage solutions, you can trust the one name with a long history of proven performance: Eaton.
40.5kV ET2
AC Metal-enclosed Switchgear
General
With decades of years' experience in the design, manufacture and application of Medium Voltage switchgear, Eaton pioneered the use of vacuum technology in the 1930s and introduced epoxy-resin insulation in the 1950s. Being at the forefront of technological advances, Eaton remains committed to product development, innovation, and improvement, while also striving to reduce size and cost.
The product is a 40.5kV indoor metal-clad withdrawable air-insulated switchgear, suitable for a three-phase AC 50Hz single-bus sectional system, including 630\~4000A ratings. It is equipped with E-VAC withdrawable vacuum circuit breakers, which are suitable for receiving and distributing electric energy in power grids, substations, industrial or mining enterprises and commercial buildings to realize the control, protection and monitoring of distribution circuits.
ET2 switchgear has a compact structure, which has been fully verified by type tests, and has been optimized in terms of safety, reliability, cost-effective and high efficiency.
Service Environment
Indoor installation and normal conditions:
• Ambient temperature -25℃\~+40℃, daily average temperature does not excéed 35℃;
• humidity conditions: daily average relative humidity ≤95%, monthly average relative humidity ≤90%;
• The surrounding air is not significantly polluted by dust, smoke, corrosive and flammable gas, steam or salt pollution;
• The altitude is not more than 1000m;
• The seismic intensity is not more than 8 degrees;
• The amplitude of electromagnetic interference induced in the secondary system should not exceed 1.6kV.
When the service conditions exceed lEC standards and the above regulations, please contact Eaton for confirmation.
Main Standard Adopted
• GB/T 3906 Alternating-current metal-enclosed switchgear and controlgear for rated voltages above 3.6kV and up to and including 40.5kV
• GB/T 11022 Common specifications for high-voltage switchgear and controlgear standards
• DL/T 404 Alternating-current metal-enclosed switchgear and controlgear for rated voltages above 3.6kV and up to and including 40.5kV
• DL/T 593 Common specifications for high-voltage switchgear and controlgear standards
• IEC 62271-200 High-voltage switchgear and controlgear-Part200: AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
Application Segment
• Metallurgy
Safe and Reliable
• Complete metal-enclosed structure to prevent the entry of dirt and small animals
• Individual compartment with separate pressure relief channel
• Earthing switch with short-circuit making capability
• Mechanical and electrical interlock effectively prevent maloperation and access into the live compartment
• Operation only on completely closed-door condition protects the personal safety
• Up to AFLR 31.5kA 1s IAC class
• Utility
• Fully third-party test certification
Easy Operation
• Industries And Corporations
• The position of the breaker and opening/closing/spring charge status can be checked through the view window in the front door
• Maintenance-free vacuum breaker and mechanism only needs a small amount of maintenance
• VCB truck adopts labor-saving lead screw to reduce torque
• Good interchangeability and easy for breaker replacement
• The secondary wiring is laid in a detachable metal wire slot for inspection
Wide Applicability
• Suitable for three-core or single-core cable connection
• Commercial Buildings
• Installing standard block current/voltage transformers • Suitable for cables or busbars entry and outgoing, also suitable for mixed entry way for cable and busbar
• Reserve interfaces on both sides of the switchboard for future expansion
• Chemical
The switchgear is divided into four compartments of busbar, circuit breaker, cable and low voltage components. The cabinet is a modular structure, which can ensure the strength and accuracy of the switchboard. The interfaces available on both sides of the panel for conveniently expansion of the existing system.
A—Low voltage compartment B—Circuit breaker compartment C—Busbar compartment D—Cable compartment
Design Against Internal Arc Faults
The vacuum circuit breaker adopts individual epoxy encapsulated pole unit and a fully insulated busbar system to ensure that the high-voltage conductors of the primary circuit are insulated and isolated from each other, avoiding/minimizing possible occurrences to the greatest extent.
Internal Arc Rating
The most serious potential threat for an operator is arcing fault inside the switchgear. The metal-clad design of the ET2, with its robust construction, has passed internal arc fault testing in all three high-voltage compartments, with an lAC rating of up to 31.5kA-1s.
According to the standard defined protection level of switchgear upon internal arc fault, the ET1 offer AFLR IAC class which approval by independent third-party test.
A = Protection for personnel (authorized personnel only)
F = Protection at the Front of the switchgear
L = Protection at the Lateral (sides) of the switchgear
R = Protection at the Rear of the switchgear
Accessibility Of Compartments
• Busbar Compartment: Tool-based/non-accessible
• Circuit Breaker Compartment: Interlock controlled
• Cable Compartment: Tool-based or optional interlock control
Partition Class: PM
The partitions and shutters employs only earthed metal sheets which has the highest level of partition classification of PM.
Protection Class
The standard external protection class of the enclosure is IP4X. The internal protection class between compartments is IP2X.
Earthing
Every switchgear is provided with a main grounding bar which runs through an arrangement. The copper bar's cross-section is selected according to the system short circuit current, which ensures a simple and effective earthing between the switchgear and the grounding grid of the substation.
The earthing conductors are distributed vertically and horizontally in the panel. They are connected to the earthing switch or/and the main earthing bar. The earthing system passes the short-circuit fault test.
The circuit breaker truck and other function truck are connected to the main earthing bar through the copper bar at the bottom of VCB compartment.
There're dedicated grounding wires to ensure reliable earthing in the doors and low-voltage compartment.
Design Overview
Safety Interlock
For personnel safety ET2 is designed with a series of interlocks to prevent fundamentally against dangerous situations and maloperation that might give rise to serious consequences and accordingly protect the operators and the switchgear.
Basic Interlocks
Only when the circuit breaker compartment door is closed can the circuit breaker be moved in or out. Only when the circuit breaker is in the testing/isolated position can the circuit breaker compartment door be opened.
• The trolley can only be moved from the test/isolation position to the service position only when the circuit breaker is tripped. Vice versa (mechanical interlock).
Only when the VCB truck is in a complete testing or working position can the circuit breaker be closed (mechanical interlock). When the truck is in the testing or service position but there is no controlled voltage, the circuit breaker cannot be closed; one can only open it manually (mechanical electrical interlock).
• When the truck is in the service position, the control plug is locked and hence cannot be pulied out.
• When the earthing switch is off, the truck cannot move from the testing/isolated position to the service position; when the truck is in the service position, the earthing switch cannot be turned off(mechanical interlock).
• Only when the earthing switch is closed, the rear door of the cable compartment may be opened (mechanical interlock). When the rear door is not closed, it is impossible to turn on the earthing switch.
Additional Interlocks
• The additional electrical or mechanical lock realizes interlocking between the busbar earthing and the upstream incoming /downstream outgoing breaker.
• The additional interlock may be installed onto the truck and/or the earthing switch operation mechanism, such as the latching electromagnet.
• Once the truck moves away, the shutters may be locked with a padlock.
• The operation hole of the earthing switch may be locked by a padlock.
• Additional electrical compulsory latching device may be installed to the door of the cable compartment of the switchgear.
Anti-condensation Measure
The space heaters are installed both in the circuit breaker and cable compartment to prevent condensation that may occur when high humidity and temperature drop.
Surface Protection
The switchgear frame is made of high-quality aluminum-zinc-clad sheet, which is formed by a flexible CNC machining center at one time, formed by multiple hemming processes, and fastened and assembled with high-strength bolts and rivets. It has high machining accuracy, good overall rigidity, and corrosion resistance.
The surfaces of exposed parts such as doors and cover plates are all sprayed with epoxy resin electrostatic powder. After electrostatic spraying, the coating is plasticized and cured at 180 C-190 C. The coating is well combined with the substrate with strong adhesion, impact resistance, corrosion resistance and beautiful appearance.
The standard color is RAL7035 gray, or according to the color code requirements provided by customers.
Auxiliary And Control Circuits
Wire Cross-section Regulations:
current circuit ≥ 2.5mm²
voltage circuit ≥ 1.5mm²
Withstand Voltage Level: 2000V/min
Wiring Method: fixed terminal block, the number of terminals meets the wiring requirements, reserve 10% for backup with connecting pieces.
Low Voltage Compartment
The low-voltage compartment is composed of a grounded metal partition to form an independent compartment. There are a plate with installing rail, terminal row and secondary earthing bar inside to provide sufficient space for LV control and protection components.
The low-voltage busbar can be flexible wire connected through a connector. Otherwise an independent low-voltage busbar channel can be set on the upper of the low-voltage compartment, which can be opened separately to facilitate the connection of LV busbars between adjacent panels.
Busbar Compartment
The busbar compartments are separated from one another through earthed metal partition and bushings. There are separate pressure relief channels. The whole busbar system is fully insulated to guarantee the insulation level and to minimize the possibility of arc fault. The bushing is installed on the stainless steel plate to reduce the eddy current heating if necessary.
The busbar bushing is equipped with equalizing ring and shield to optimize the local electric field, ensure reliable insulation and low partial discharge level.
Busbar System
Both the main and the branch busbar are made of high-conductivity rectangular copper bars with rounded corners.
• Each busbar compartment is separated by a separate partition.
• The copper bar is coated with epoxy resin or equipped with heat shrinkable sleeve, and the joint is covered with insulating boots.
• The fully insulated main busbar runs through the entire arrangement.
• The busbar supported via long creepage insulators.
• Pre-drilled copper bars are convenient for on-site connection.
• The maximum rated current of the busbar system is 4000A and short-circuit withstand 40kA-4s.
Design Overview
Circuit Breaker Compartment
The circuit breaker compartment is composed of grounded metal partitions, and there is an independent pressure relief channel on the upper part.
The circuit breaker truck is mechanically interlocked with the door. The door can only be opened when the circuit breaker is opened and returned to the test position.
With the door fully closed, the circuit breaker can be opened or closed from the front of the switchgear using a manual button or lever.
A set of guide rail is installed at the bottom of the circuit breaker compartment for the truck to be positioned and moved. The guide rail can automatically align the contacts when the VCB truck is racking in. An automatic shutter drive mechanism is set to ensure that the shutter is automatically opened when the truck moves from the "test" position to the "service" position; when it moves in the opposite direction, the shutter is automatically closed to effective shield the contacts.
The earthing copper bar is installed at the bottom of the circuit breaker compartment to ensure that the truck is connected to the main earthing system as soon as it enters the "test" position. It is earthed continuously when the truck is racking in and out inside the panel.
Shutters
The metal shutters on the busbar and cable sides can be operated independently, and the shutters will automatically open or close as the truck is rolled in or out
When the circuit breaker is in the test or isolation position, the shutter will be automatically closed to prevent expose of any live parts.
When the circuit breaker truck is moved out of the panel, a padlock can be added in the closed state of the shutter to ensure that the maintenance person will not touch the high-voltage live conductor.
Cable Compartment
Components such as current transformers, voltage transformers, earthing switch and surge arresters can be installed in the cable compartment. Insulation partitions are installed to ensure the insulating strength between phases and to the ground.
The opening and closing status of the earthing switch can be observed behind the cable compartment door.
There is a mechanical interlock between the cable compartment door and the earthing switch. The door can only be opened when the earthing switch is closed; the earthing switch can be closed only when the door is completely closed and locked.
The cable connection terminal can be connected in parallel with maximum three single-core cables or three 400mm² three-core cables and the connection height can reach 750mm, which is convenient for connection.
A horizontal main earthing busbar is installed at the rear and lower part of the cable compartment. After the installation is completed, the entire row of panels is connected and linked to the main grounding grid of the substation.
Current/voltage Transformers
The switchgear is equipped with standard epoxy resin cast block current transformers.
Equipped with electromagnetic epoxy casting voltage transformers, they can be fixed or withdrawable installed.
E-VAC-40.5 Vacuum Circuit Breaker
• Vacuum breaker's pole unit is sealed by epoxy resin, which excellent insulation performance verified by condensation test, adapt to harsh environment.
• Eaton's latest generation of vacuum interrupter is adapt with long life, low loss and low chopping current
• The latest spring operating mechanism with stable performance, long life and maintenance free under normal service conditions
• Ideal breaking performance for capacitive loads with extremely low re-strike(single capacitor or back-to-back capacitor bank)
• Both AC and DC electrical operation available
• The auxiliary contacts can be used to indicate the spring charging status
• Mechanical status indicator shows the closed/opened state
• The auxiliary contact shows the closed/opened state
• The service/testing position of the circuit breaker can be shown by the position indicator
• The auxiliary contact available for remote display of the position
• Mechanical interlock for operation only when door be closed
• The mechanical interlock ensures that the circuit breaker may only be racking in or out while breaker opened
Earthing Switch
The earthing switch is installed in the rear of cable compartment. All the operation is performed in front of the panel. The status of the earthing switch can be directly observed through the door window and can be displayed through the indication on the low-voltage door.
There is a mechanical interlock between the earthing switch and the circuit breaker truck. The earthing switch can only be closed when the truck is in the test/isolation position.
The earthing switch and the cable compartment door are also provided with a mechanical interlock to ensure that the door can only be opened after the earthing switch is closed.
• The earthing switch verified by the making test
• Operated in front of the panel, reduced the operating torque via the bevel gear
• Auxiliary contacts can be added to indicate the opening/closed position
• Mechanical status indicator
• Mechanical and/or electrical interlocks with vacuum circuit breakers for operator safety
Quality And Service Warranty
Test Certifications
• All products have been certified through type-testing performed at a third-party test station
• Related product high-tech certifications
Factory Acceptance Test (FAT)
• According to the test items required by the customer to implement the FAT test
• Provide facilities and simulated on-site environment and equipment for testing, measurement and complete documentation as required
• The whole process is attended, witnessed and recorded by the customer's engineer
Routine Test
Strict factory inspections are performed on each vacuum interrupter, circuit breaker and switchgear. Upon completion of the overall installation, thorough appearance inspection and mechanical functional and electrical tests should be performed
• Before being released from the factory, circuit breakers go through standard switchgear coordination tests to ensure product interchangeability and universality
• Before being released from the factory, circuit breakers go through the run-in test for mechanical operation to ensure steadiness of the performance
• All the ex-work inspection data of products are archived and traceable
Quality Control
• The R&D process is managed by the Prolaunch process
• The manufacturing plant follows the global unified Eaton quality, environment and safety system (EQS&EHS); has passed ISO14001/OHSAS18001 system certification
• The switchgear and circuit breakers are equipped with tooling to ensure dimensional consistency
• Quality test from raw material to finished product
\- Automatic triaxial image test
\- X-ray inspection
\- Circuit resistance test
\- Breaker mechanical characteristic test
\- Hi-pot and partial discharge test
\- Mechanical and electrical function test
Service Commitment
• Service outlets all over the country
• After-sales service team engineers have more than 10 years of work experience and good skills, can quickly and efficiently handle on-site faults, and cooperate with users on-site installation, commissioning and operation
• Respond to customer feedback and complaints within 8 hours
• After-sales service hotline: 400-828-0505
Technical Data
Technical Data For Switchgear
| Type | ET2-40.5 | |
| System | ||
| Rated Voltage | kV | 40.5 |
| Rated Power Frequency Withstand Voltage(1 min) | kV | 95(Phase-to-phase, Phase-to-earth )/118(Open contacts gap) |
| Rated Lightning Impulse Withstand Voltage(BIL) | kV | 185(Phase-to-phase, Phase-to-earth )/215(Open contacts gap) |
| Frequency | Hz | 50 |
| Busbar System | ||
| Rated Current of main busbar | A | 1250; 1600; 2000; 2500; 3150&4000 |
| Rated Current of branch busbar | A | 630;1250;1600;2000;2500;3150&4000(FC)* |
| Short Time Withstand Current (RMS) | kA/s | 25; 31.5; 40/4 |
| Rated Peak Withstand Current (Peak) | KA | 63; 80; 100 |
| Protection | Enclosure: IP4X, compartment: IP2X | |
| Size | ||
| Width | mm | 1200/1400/1680 |
| Height | mm | 2600 |
| Depth | mm | 2800/3000 |
| Weight(VCB included) | kG | 1200~1650 |
Technical Data For Circuit Breaker
| Type | E-VAC-40.5 | |
| Rated Voltage | kV | 40.5 |
| Rated Power Frequency Withstand Voltage(1 min) | kV | 95 |
| Rated Lightning Impulse Withstand Voltage(BIL) | kV | 185 |
| Frequency | Hz | 50/60 |
| Rated Current | A | 1250;1600;2000;2500; 3150; 4000(FC) |
| Rated Short Circuit Breaking Current (RMS) | KA | 31.5; 40 |
| Short Time Withstand Current (RMS,4s) | KA | 31.5; 40 |
| Rated Short Circuit Making Current (Peak) | KA | 82; 106 |
| Rated Peak Withstand Current | KA | 82; 106 |
| Rated Single/Back-to-back Capacitor Bank Breaking Current | A | 630/400 |
| Rated Single/Back-to-back Capacitor Bank Inrush Current | KA | 20(No more than 4250Hz frequency) |
| Breaker Classification | E2/M2/C2 | |
| Opening Time | mm | 20~50 |
| Closing Time | mm | 35~70 |
| Mechanical Endurance | Cycles | 10,000 |
| Operating Sequence | O-0.3s-CO-15s-CO; O-0.3s-CO-180s-CO | |
| Charging Motor Power | W | 80 |
| Charging Motor Voltage | V | DC/AC110,DC/AC220 |
| Motorised Charging Time | S | ≤15 |
| Operating Voltage for Closing/Openning Coil | V | DC/AC110, DC/AC220 |
SLD And Configuration
| Typical Panel | Incomer 1 | Incomer 2 | Feeder 1 Feeder 2 Feeder 3 Mertering![]() ![]() ![]() ![]() | ||||||||||||||
| Signle line diagram | ![]() | ![]() | |||||||||||||||
| Rated current (A) | 630~3150 | 630~3150 | 630~3 | 150 | 630~3150 | 630~3150 | 630~3150 | ||||||||||
| Primnry mnts | Vacuum breaker E-VAC | ● | 1pcs | ● | 1pcs | ● | 1pcs | ● | 1pcs | O | 1pcs | ||||||
| Disconnect truck GLC | |||||||||||||||||
| CT LZZBJ9-36 | ● | 3pcs | O | 3pcs | ● | 3pcs | ● | 3pcs | C | 3pcs | O | 3pcs | |||||
| Voltage transformerJDZX9-35/JDZX11-35R | O | 1pcs/Fixed | 3pcs/Fixed | 3pcs/Withdrawable | |||||||||||||
| HRC fuseXRNT-40.5/XRNP-40.5 | O | 2pcs/Fixed | 3pcs/Fixed | 3pcs/Withdrawable | |||||||||||||
| Earthing switch ES-40.5 | ● | 1pcs | ● | 1pcs | O | 1pcs | |||||||||||
| OCT LXK | O | 1pcs | |||||||||||||||
| Voltage indicator | ● | 1pcs | ● | 1pcs | ● | 1pcs | ● | 1pcs | ● | 1pcs | ● | 1pcs | |||||
| Surge arresterHY5WZ-51/134 | O | 3pcs | O | 3pcs | O | 3pcs | |||||||||||
| Transformer SC9-50/35 | |||||||||||||||||
| Typical Panel | Bus Section | Riser | Busbar VT 1 | Busbar VT 2 | Busbar VT 3 | Transformer | |||||||||||
| Signle line diagram | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | |||||||||||
| Rated current (A) | 630~3 | 150 | 630~3 | 150 | <=630 | <=630 | <=630 | <=200A | |||||||||
| Primny rmnnts | Vacuum breaker E-VAC | 1pcs | |||||||||||||||
| Disconnect truck GLC | ● | 1pcs | ● | 1pcs | |||||||||||||
| CT LZZBJ9-36 | ● | 3pcs | O | 3pcs | |||||||||||||
| Voltage transformerJDZX9-35/JDZX11-35R | 3pcs/Fixed | 3pcs/Fixed | 3pcs/Withdrawable | ||||||||||||||
| HRC fuseXRNT-40.5/XRNP-40.5 | O | 3pcs/Fixed | 3pcs/Withdrawable | 3pcs/Withdrawable | 3pcs/Withdrawable | ||||||||||||
| Earthing switch ES-40.5 | O | 1pcs | |||||||||||||||
| OCT LXK | |||||||||||||||||
| Voltage indicator | ● | 1pcs | ● | 1pcs | ● | 1pcs | ● | 1pcs | ● | 1pcs | ● | 1pcs | |||||
| Surge arresterHY5WZ-51/134 | O | 3pcs | 3pcs/Withdrawable | O | 3pcs | ||||||||||||
| Transformer SC9-50/35 | C | 1pcs | |||||||||||||||
Ordering and others
Ordering Information
It is required to provide the following information when placing an order:
• System wiring diagram, Sigle line diagram and floor plan
• Basic data including rated voltage: rated current, VCB breaking/making current, control voltage etc
• Incoming and outgoing ways and the specification and quantity of cables
• Special requirements for component model, specification and quantity (if any, please list)
• For special service environments or requirements, please contact Eaton first
Spare Parts And Accessories
The accessories of switchgear include:
• VCB charging and racking handle
• Earthing switch operating handle
• VCB opening/closing push rod
• Door key
• Guiding rail
• Specialized tools kit
Spare parts include:
• VT protection fuse
• Opening coil
• Closing coil
• Voltage indicator
• Indication lamp
• Transfer switch
• electromagnetic lock
The spare parts list is ultimately determined by both the supplier and the buyer according to the customer's requirements.
Included Documents
• Product Qualification Certificate
• Routine test report
• Packing list
• User manual
• List of spare parts and accessories
• Secondary wiring diagram
• Other relevant materials required by the customer
Foundation And Floor Openings
Eaton is an intelligent power management company dedicated to protecting the environment and improving the quality of life for people everywhere. We make products for the data center, utility, industrial, commercial and institutional, machine building, residential, aerospace and mobility markets. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power — today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we're helping to solve the world's most urgent power management challenges and building a more sustainable society for people today and generations to come.
Founded in 1911, Eaton has continuously evolved to meet the changing and expanding needs of our stakeholders. With revenues of $27.4 billion in 2025, the company serves customers in 180 countries. Eaton entered the Chinese market in 1993 and has grown significantly since then. In 2004, Eaton moved its Asia-Pacific headquarters from Hong Kong to Shanghai. Today, Eaton has nearly 9,000 employees and 20 manufacturing facilities in China.
For more information about Eaton China, visit www.eaton.com.cn
For more information, visit Eaton.com.cn
Eaton Corporation
Asia Pacific Headquarter
No.3, Lane 280, Linhong Road,
Changning District,
Shanghai 200335
www.eaton.com.cn/electrical
















