40.5kV Solid-Insulated Vacuum Circuit Breaker for C-GIS Applications
Medium- and high-voltage switchgear requires circuit breakers that match both electrical ratings and cabinet design. The 40.5kV Solid-Insulated Vacuum Circuit Breaker from Dongfa Intelligent combines a vacuum interrupter, solid-insulated pole, and three-position operating mechanism for C-GIS and compact switchgear applications.
Solid insulation integrates the vacuum interrupter and related conductive and insulation structures into a compact insulated pole. This structure is designed for switchgear applications where electrical components and internal cabinet space need to be coordinated.
The series covers 12kV, 24kV, and 40.5kV voltage classes. Depending on the configuration, rated current ranges from 630A to 2500A, while rated short-circuit breaking current ranges from 20kA to 40kA.
The vacuum interrupter and related conductive and insulation structures are integrated within the solid-insulated pole.
The mechanism provides closed, isolated/open, and earthed positions for the corresponding switchgear arrangement.
The structure is designed for C-GIS and compact switchgear applications where space and mechanical interfaces are important.
A key feature of the design is the three-position operating mechanism. It integrates circuit breaker operation with isolation and earthing functions, allowing the operating sequence to be coordinated within the switchgear system.
For a specific project, the mechanism and interlocking arrangement should be matched with the cabinet design and the required operating sequence.
The available configurations cover different voltage, current, and short-circuit requirements. The main parameters can be reviewed before selecting the appropriate configuration for a switchgear project.
| Parameter | Specification |
|---|---|
| Rated Voltage | 12kV / 24kV / 40.5kV |
| Rated Frequency | 50Hz |
| Rated Current | 630A / 1250A / 1600A / 2000A / 2500A |
| Short-Circuit Breaking Current | 20kA / 25kA / 31.5kA / 40kA |
| Mechanical Life | 10,000 operations |
| Energy Storage Motor Voltage | AC/DC 220V / 110V |
| Energy Storage Time | ≤15s |
| Rated Short-Time Withstand Duration | 4s |
Selecting a vacuum circuit breaker involves more than checking the system voltage. Electrical ratings and mechanical installation conditions should be considered together, especially when the breaker is intended for C-GIS or replacement projects.
For replacement applications, the original circuit breaker model, mounting drawings, switchgear information, and electrical parameters should be reviewed together before configuration.
40.5kV Solid-Insulated Vacuum Circuit Breaker
The solid-insulated structure and integrated operating mechanism make the series suitable for different medium- and high-voltage switchgear arrangements. The final configuration should be matched to the electrical and mechanical requirements of the equipment.
Used where circuit breaking, isolation, and earthing functions need to be coordinated within the cabinet.
Suitable for switchgear designs where internal space and component interfaces require careful coordination.
Can be evaluated against existing equipment based on electrical parameters, mounting dimensions, and mechanism requirements.
Dongfa Intelligent has 14 years of experience in the high-voltage electrical industry. The company operates ISO 9001, ISO 14001, and ISO 45001 management systems, with products manufactured according to applicable GB standards and relevant IEC 62271 requirements.
Relevant factory testing includes resistance testing, mechanical operation testing, power-frequency withstand testing, and vacuum inspection. Testing requirements can vary according to the product configuration and applicable technical documentation.
Customers can also review the company's company information and manufacturing background when evaluating a supplier for a switchgear project.
Different switchgear projects may require different electrical ratings, mounting arrangements, mechanism voltages, and interlocking configurations. Technical confirmation can therefore be carried out according to the actual equipment requirements.
For projects involving different types of medium-voltage switching equipment, customers can also review the available Vacuum Circuit Breakers and related switchgear products according to their application requirements.
Where a project also involves switching and isolation functions, the related Load Break Switches can be evaluated as part of the overall switchgear configuration.
The series covers 12kV, 24kV, and 40.5kV voltage classes.
Rated current options include 630A, 1250A, 1600A, 2000A, and 2500A.
Available ratings are 20kA, 25kA, 31.5kA, and 40kA.
The three positions are closed, isolated/open, and earthed.
The energy storage motor voltage options are AC/DC 220V and 110V.
The original circuit breaker model, mounting drawings, switchgear information, electrical ratings, mechanism voltage, and three-position interlocking requirements should be provided for technical review.
The 40.5kV Solid-Insulated Vacuum Circuit Breaker provides a configurable solution for C-GIS, compact switchgear, and selected replacement applications. With different voltage, current, short-circuit breaking, and operating mechanism options, the configuration can be matched to specific electrical and mechanical requirements.
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