Dongfa Intelligent is a China manufacturer of the 40.5kV Solid-Insulated Vacuum Circuit Breaker for medium- and high-voltage switchgear. Its main structure includes a vacuum interrupter, solid-insulated pole, conductive circuit, and three-position operating mechanism.
The solid-insulated pole encapsulates the vacuum interrupter and related conductive and insulation structures within a solid insulating material, forming an integrated insulation structure around the key electrical components. The three-position mechanism combines circuit breaker operation with isolation and earthing positions for use in C-GIS and compact switchgear.
The series covers 12kV, 24kV, and 40.5kV voltage classes, with rated current from 630A to 2500A and short-circuit breaking current from 20kA to 40kA.
The 40.5kV Solid-Insulated Vacuum Circuit Breaker uses a solid-insulated pole containing the vacuum interrupter, conductive loop, and epoxy resin insulation body. The integrated structure is designed for C-GIS and compact switchgear applications.
The operating mechanism integrates circuit breaker, disconnector, and earthing switch functions. The three operating positions are closed, isolated/open, and earthed. Mechanical interlocking controls the operating sequence between the positions.
The solid-insulated structure and integrated three-position mechanism are suitable for switchgear where electrical functions, mechanical interfaces, and internal cabinet space need to be coordinated. The final configuration should match the switchgear design and mounting requirements.
The main electrical and mechanical parameters of the series are shown below.
| Parameter | Specification |
| Product Type | Solid-Insulated Three-Position Vacuum Circuit Breaker |
| Rated Voltage | 12kV / 24kV / 40.5kV |
| Rated Frequency | 50Hz |
| 1min Power-Frequency Withstand Voltage, Phase/Earth/Gap | 42kV / 65kV / 95kV |
| Lightning Impulse Withstand Voltage, Phase/Earth/Gap | 75kV / 118kV / 125kV |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Rated Current | 630A / 1250A / 1600A / 2000A / 2500A |
| Rated Short-Circuit Breaking Current | 20kA / 25kA / 31.5kA / 40kA |
| Rated Short-Circuit Making Current, Peak | 50kA / 63kA / 80kA / 100kA |
| Rated Short-Time Withstand Duration | 4s |
| Rated Short-Circuit Breaking Operations | 30 operations |
| Mechanical Life | 10,000 operations |
| Contact Gap | 12kV: 9±1mm; 24kV: 13±1mm; 40.5kV: 18±1mm |
| Over-Travel | 3.5±0.5mm |
| Three-Phase Opening/Closing Asynchronous | ≤2ms |
| Closing Contact Bounce Time | 12kV: ≤2ms; 24kV: ≤2ms; 40.5kV: ≤3ms |
| Average Opening Speed | 12kV: 0.9-1.3m/s; 24kV: 1.1-1.6m/s; 40.5kV: 1.8±0.2m/s |
| Average Closing Speed | 12kV: 0.4-0.8m/s; 24kV: 0.6-1.0m/s; 40.5kV: 0.8±0.2m/s |
| Closing Time | 30-70ms |
| Opening Time | 15-45ms |
| Energy Storage Motor Voltage | AC/DC 220V / 110V |
| Energy Storage Motor Power | 70W |
| Energy Storage Time | ≤15s |
Contact pressure varies according to the rated short-circuit breaking current. The specified values are 2000±200N for 20kA, 2400±200N for 25kA, and 3100±200N for 31.5kA. The contact pressure for the 40kA configuration is to be confirmed.
| Rated Short-Circuit Breaking Current | Contact Pressure |
| 20kA | 2000±200N |
| 25kA | 2400±200N |
| 31.5kA | 3100±200N |
| 40kA | To be confirmed |
The selected contact pressure should correspond to the required short-circuit breaking current and specific product configuration.
Selection of the 40.5kV Solid-Insulated Vacuum Circuit Breaker should consider both electrical ratings and the mechanical conditions of the matching switchgear.
For replacement projects, electrical ratings alone are not sufficient for compatibility confirmation. The original circuit breaker and matching cabinet information should be reviewed together.
Required information includes:
If the existing equipment uses a special mounting structure or mechanical interface, the relevant drawings should be provided for technical review before configuration.
The three-position mechanism provides circuit breaking, isolation, and earthing functions for C-GIS switchgear. The circuit breaker configuration should correspond to the cabinet's electrical ratings and mechanical interfaces.
The solid-insulated pole and integrated mechanism are suitable for compact switchgear where the internal arrangement requires coordination between electrical components and cabinet dimensions.
The product can be evaluated for replacement applications based on the original circuit breaker model, electrical parameters, mounting dimensions, operating mechanism, and interlocking arrangement.
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. Products are 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. The specific test requirements depend on the product configuration and applicable technical documentation.
The 40.5kV Solid-Insulated Vacuum Circuit Breaker can be configured according to project requirements. Technical confirmation can cover rated voltage, rated current, short-circuit breaking current, operating mechanism voltage, mounting dimensions, switchgear information, three-position interlocking, nameplate, and packaging requirements.
For replacement or customized projects, the original equipment drawings and technical parameters can be reviewed before production. This includes both electrical specifications and mechanical installation conditions.
Standard lead time is 7-15 working days, while customized products generally require 15-30 working days. Technical inquiries receive a response within 1 working day, and after-sales issues receive a response within 24 hours.
It consists of a vacuum interruptor, solid-insulated pole, conductive loop, epoxy resin insulation body, and three-position operating mechanism.
The three positions are circuit breaker closed, isolated/open, and earthed.
The series covers 12kV, 24kV, and 40.5kV.
Rated current options are 630A, 1250A, 1600A, 2000A, and 2500A.
The available ratings are 20kA, 25kA, 31.5kA, and 40kA.
Please provide the original model, mounting drawings, switchgear information, electrical ratings, mechanism voltage, and three-position interlocking requirements.
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No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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