Dongfa Intelligent is a manufacturer of indoor high-voltage electrical equipment, providing the 24kV Indoor Vacuum Circuit Breaker for medium-voltage switchgear and power distribution projects. The 3(VS1)-24 is configured for indoor installation and combines vacuum interruption with circuit closing and opening functions. Its configuration can be selected according to the required current rating, fault interruption level, insulation requirements, operating sequence and mechanical life of the intended electrical system.
The available rated current configurations include:
Different power distribution circuits have different load capacities. The rated current of the vacuum circuit breaker should therefore be selected according to the actual operating current and system design requirements.
The rated short-circuit breaking current options are:
The corresponding 4-second rated short-time withstand currents are:
The rated short-circuit making current and rated peak withstand current are:
The product technical data specifies different insulation levels for phase-to-phase, phase-to-earth and the vacuum interrupter.
| Parameter | Specification |
| Rated Voltage | 24kV |
| Rated Frequency | 50Hz |
| Power-Frequency Withstand Voltage, Phase-to-Phase / Phase-to-Earth | 65kV |
| Power-Frequency Withstand Voltage, Vacuum Interrupter | 79kV |
| Lightning Impulse Withstand Voltage, Phase-to-Phase / Phase-to-Earth | 125kV |
| Lightning Impulse Withstand Voltage, Vacuum Interrupter | 145kV |
The specified mechanical life of the 24kV Indoor Vacuum Circuit Breaker is 10,000 operations. The product also specifies an allowable cumulative contact wear of 3mm.
The supplied technical data specifies the following operating sequences:
The product is also specified for 20 short-circuit breaking operations.
| Parameter | Specification |
| Rated Cable-Charging Breaking Current | 31.5A |
| Rated Single Capacitor Bank Breaking Current | 630A |
| Rated Back-to-Back Capacitor Bank Breaking Current | 400A |
| Parameter Items | Technical Specifications |
| Model | 3(VS1)-24 |
| Rated Voltage | 24kV |
| Rated Frequency | 50Hz |
| Rated Current | 630 / 1250 / 1600 / 2000 / 2500 / 3150A |
| Rated Short-Circuit Breaking Current | 20 / 25 / 31.5kA |
| Rated Short-Time Withstand Current, 4s | 20 / 25 / 31.5kA |
| Rated Short-Circuit Making Current | 50 / 63 / 80kA |
| Rated Peak Withstand Current | 50 / 63 / 80kA |
| Power-Frequency Withstand Voltage, Phase-to-Phase / Phase-to-Earth | 65kV |
| Power-Frequency Withstand Voltage, Vacuum Interrupter | 79kV |
| Lightning Impulse Withstand Voltage, Phase-to-Phase / Phase-to-Earth | 125kV |
| Lightning Impulse Withstand Voltage, Vacuum Interrupter | 145kV |
| Mechanical Life | 10,000 operations |
| Allowable Cumulative Contact Wear | 3mm |
| Rated Operating Sequence | 0-0.3s-CO-180s-CO; 0-180s-CO-180s-CO (40kA) |
| Short-Circuit Breaking Operations | 20 |
| Rated Cable-Charging Breaking Current | 31.5A |
| Rated Single Capacitor Bank Breaking Current | 630A |
| Rated Back-to-Back Capacitor Bank Breaking Current | 400A |
Suitable for medium-voltage distribution systems in mining facilities where the electrical parameters, installation conditions and operating environment meet the product requirements.
Applied in industrial plants and production facilities for medium-voltage circuit switching and electrical distribution, with the configuration selected according to the specific system requirements.
For replacement or retrofit projects, providing the existing breaker model, switchgear model, installation drawing and main electrical parameters can help with product matching before production.
Dongfa operates a production facility of more than 2,000 square meters with 2 professional production lines and 1 set of testing equipment. The team includes 17 employees, with 4 personnel dedicated to R&D and technical work.
The company holds ISO 9001, ISO 14001 and ISO 45001 certifications. Core products have completed type testing through the National High-Voltage Electrical Apparatus Quality Supervision and Inspection Center and are manufactured in accordance with relevant GB and IEC standards.
Product configurations can be reviewed according to the required voltage and current ratings, short-circuit breaking capacity, switchgear dimensions, installation interfaces and other technical conditions of the project.
Dongfa provides OEM/ODM production based on customer drawings, technical specifications and application requirements. Its products serve power systems, industrial and mining projects, rail transportation, new energy and other application fields.
The 3(VS1)-24 is available in rated current configurations of 630A, 1250A, 1600A, 2000A, 2500A and 3150A. The appropriate rating can be selected according to the load requirements of the application.
The breaker is offered with rated short-circuit breaking current levels of 20kA, 25kA and 31.5kA. The required level should correspond to the calculated fault current of the electrical system.
The specified mechanical life reaches 10,000 operations, while the allowable cumulative contact wear is 3mm. These values can be referenced during equipment inspection and maintenance.
For standard 24kV Indoor Vacuum Circuit Breaker products, customers can place a 1-unit trial order. This MOQ arrangement is suitable for initial project evaluation or sample requirements.
Please provide the required current rating, short-circuit level, switchgear information, installation requirements and order quantity. For retrofit projects, the existing breaker model and relevant drawings can also be provided for technical confirmation.
Standard products generally have a lead time of 7-15 working days. Customized OEM orders normally require 15-30 working days, depending on the confirmed configuration.
Address
No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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