For indoor switchgear applications, the 12kV Indoor Side-Mounted Vacuum Circuit Breaker from Dongfa Intelligent, a professional manufacturer, provides a side-mounted configuration for circuit control, connection, disconnection, and short-circuit fault interruption. Its operating mechanism is arranged on the side of the breaker, allowing the installation layout to be coordinated with the internal space and structural arrangement of the corresponding switchgear. Mechanical linkage, electrical connections, and installation interfaces should be considered during integration.
For new projects, selection should be based on the required electrical specifications and switchgear configuration. For replacement or retrofit applications, the original breaker model, cabinet model, installation dimensions, and relevant drawings can be provided to support technical matching before production.
The operating mechanism is arranged on the side of the circuit breaker, making the product suitable for indoor medium-voltage switchgear with corresponding cabinet layouts.
The side-mounted structure helps optimize component arrangement inside the cabinet and supports matching with the mechanical linkage, electrical connections, and installation interfaces of corresponding switchgear.
Main structural features:
For retrofit or replacement projects, customers can provide the original circuit breaker model, switchgear model, installation dimensions, and related drawings. Dongfa's technical team can assist with structural matching before production.
The circuit breaker provides rated short-circuit breaking current options of 20kA, 25kA, and 31.5kA. The corresponding rated short-time withstand current for 4 seconds is 20kA, 25kA, or 31.5kA, while the rated short-circuit making current and rated peak withstand current are 50kA, 63kA, or 80kA according to the selected specification.
These values support product selection based on system short-circuit calculations and protection requirements.
The 12kV Indoor Side-Mounted Vacuum Circuit Breaker is designed for indoor 12kV medium-voltage power distribution applications. Its insulation parameters include power frequency withstand voltage and lightning impulse withstand voltage for the circuit breaker and vacuum break.
The operating mechanism supports AC/DC 110V and 220V control voltage configurations. The rated operating sequence is O-0.3s-CO-180s-CO, and the rated mechanical life is 1000 cycles. The selected control voltage should match the requirements of the on-site control power supply and protection control system.
The main mechanical parameters cover contact opening distance, overtravel, and opening and closing bounce time. These values provide reference for technical verification, product acceptance, and equipment matching.
| Parameter Items | Specification |
| Product Type | Indoor side-mounted vacuum circuit breaker |
| Rated Voltage | 12kV |
| Rated Frequency | 50Hz |
| Rated Current | 1250A |
| Rated Short-Circuit Breaking Current | 20 / 25 / 31.5kA |
| Rated Short-Circuit Making Current | 50 / 63 / 80kA |
| Rated Peak Withstand Current | 50 / 63 / 80kA |
| Rated Short-Time Withstand Current, 4s | 20 / 25 / 31.5kA |
| Power Frequency Withstand Voltage | 42kV |
| Vacuum Break Power Frequency Withstand Voltage | 48kV |
| Lightning Impulse Withstand Voltage | 75kV |
| Vacuum Break Lightning Impulse Withstand Voltage | 84kV |
| Rated Operating Sequence | O-0.3s-CO-180s-CO |
| Mechanical Life | 1000 cycles |
| Operating Mechanism Rated Closing Voltage | AC/DC 110V, 220V |
| Operating Mechanism Rated Opening Voltage | AC/DC 110V, 220V |
| Contact Distance | 11±1mm |
| Overtravel | 3.5±0.5mm |
| Three-Phase Opening/Closing Bounce Time | ≤2ms |
| Contact Closing Bounce Time | ≤2ms |
The circuit breaker is suitable for indoor medium-voltage power distribution environments. The installation environment should meet the following humidity conditions:
Condensation may occasionally occur. Installation should be assessed according to the site environment, switchgear protection level, ventilation, and insulation requirements.
The 12kV Indoor Side-Mounted Vacuum Circuit Breaker is used for circuit control and short-circuit fault current interruption in indoor 12kV medium-voltage power distribution systems. It can also be applied to relevant medium-voltage distribution equipment in power stations when the electrical and installation requirements are met.
The circuit breaker is suitable for indoor medium-voltage power distribution in mines, industrial plants, and production facilities. Application should be confirmed according to the environmental conditions, electrical parameters, and switchgear requirements of the project.
The side-mounted structure is suitable for corresponding medium-voltage switchgear designs. Matching can be confirmed according to cabinet structure, installation dimensions, mechanical linkage, electrical connections, and other interface requirements.
For new projects, it is recommended to confirm the switchgear model, installation dimensions, and interface requirements in advance. For old cabinet renovation or equipment replacement, customers can provide the original circuit breaker model, cabinet structure drawings, installation dimensions, and main electrical parameters for matching.
Dongfa supports customization of nameplates, packaging, product manuals, and related documentation. For non-standard products, customers can provide drawings, installation dimensions, and technical parameters for technical confirmation and production.
Standard products generally require approximately 7-15 working days, while customized products generally require approximately 15-30 working days. The actual delivery time depends on the selected specifications and project requirements.
Standard products support trial orders starting from 1 unit. Technical consultations typically receive a response within 1 business day, and after-sales issues are followed up and handled within 24 hours.
Zhejiang Dongfa Intelligent Electrical Technology Co., Ltd. was established in 2012 and focuses on the R&D, manufacturing, and sales of high and low voltage electrical products. The company is located in Yueqing Economic Development Zone, Wenzhou, Zhejiang, China.
The production base covers more than 2,000m² and has 2 production lines. The company has 17 employees, including 4 technical personnel, with a monthly production capacity of approximately 600-700 units and an annual capacity of approximately 7,000-8,000 units.
The company has established ISO 9001, ISO 14001, and ISO 45001 management systems. Products comply with relevant GB standards and IEC 62271 requirements. Core products are supported by type test reports, with factory testing including resistance testing, mechanical operation testing, withstand voltage testing, and vacuum degree checks.
Dongfa provides support for product selection, specification confirmation, solution matching, technical communication, and after-sales follow-up based on project requirements. Its products are used in power supply bureaus, power companies, power plants, mines, and industrial enterprises, with exports to Southeast Asia and parts of Europe.
It is designed for indoor 12kV medium-voltage power distribution systems and is primarily used for circuit connection, disconnection, and short-circuit fault current interruption.
The rated current is 1250A.
The product is available with rated short-circuit breaking currents of 20kA, 25kA, and 31.5kA. The appropriate specification can be selected according to the actual short-circuit level of the project.
The operating mechanism supports AC/DC 110V and 220V control voltages.
The power frequency withstand voltage is 42kV, and the vacuum break power frequency withstand voltage is 48kV. The lightning impulse withstand voltage is 75kV, while the vacuum break lightning impulse withstand voltage is 84kV.
The rated mechanical life is 1000 cycles. The contact distance is 11±1mm, the overtravel is 3.5±0.5mm, and both the three-phase opening and closing bounce time and contact closing bounce time are ≤2ms.
Customers can provide the original circuit breaker model, switchgear model, installation dimensions, cabinet structure drawings, and main electrical parameters. Dongfa's technical team can use these details to confirm the structural and electrical matching requirements.
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No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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