Outdoor 12kV distribution equipment does not always follow one fixed mounting arrangement. The 12kV Outdoor Vacuum Circuit Breaker from Zhejiang Dongfa Intelligent Electrical Technology Co., Ltd. is designed as a general outdoor configuration suitable for outdoor distribution cabinets, box-type substations, bracket structures, and other compatible installations. Its 630A/1250A rated current and 20kA/25kA/31.5kA breaking capacity can be selected according to the requirements of each distribution circuit.
The breaker is available with three rated short-circuit breaking capacities: 20kA, 25kA, and 31.5kA. This allows project teams to match the breaking capacity to the calculated fault level of the installation instead of applying one fixed rating across different distribution points.
The breaker also has a rated short-time withstand current of 20kA, a rated peak withstand current of 50kA, and a rated short-circuit making current of 50kA.
This product is not limited to one dedicated mounting method. Its general outdoor design can be considered for different outdoor equipment arrangements, provided that the mounting dimensions, electrical connections, and operating requirements are compatible.
ZW32-12 and ZW32-12G are available for different outdoor structural requirements. Model selection should be based on the actual installation arrangement and dimensional requirements, not on the electrical rating alone.
The available rated current options are 630A and 1250A. The appropriate rating should be determined according to the designed circuit load and the requirements of the 12kV distribution system.
The specified power-frequency withstand voltage is 42kV/48kV, and the lightning impulse withstand voltage is 75kV/85kV for the corresponding phase-to-earth and interruptor insulation levels. These values should be reviewed together with the insulation requirements of the installation.
| Parameter | Specification |
| Product Type | Outdoor Vacuum Circuit Breaker |
| Model | ZW32-12 / ZW32-12G |
| Rated Voltage | 12kV |
| Rated Frequency | 50Hz |
| Rated Current | 630A / 1250A |
| Rated Short-Circuit Breaking Current | 20kA / 25kA / 31.5kA |
| Rated Short-Time Withstand Current | 20kA |
| Rated Peak Withstand Current | 50kA |
| Rated Short-Circuit Making Current | 50kA |
| Power-Frequency Withstand Voltage | 42kV / 48kV |
| Lightning Impulse Withstand Voltage | 75kV / 85kV |
| Secondary Circuit 1min Power-Frequency Withstand | 2kV |
| Mechanical Life | 10,000 operations |
| Rated Short-Circuit Breaking Operations | ≥30 |
| Installation | Outdoor; specific arrangement to be confirmed |
Selecting a general outdoor breaker requires separating electrical requirements from physical installation requirements. This is especially important because the same 12kV voltage level can be used in different outdoor equipment arrangements.
Start with the circuit requirements and determine whether the 630A or 1250A configuration is suitable for the designed load.
Compare the calculated short-circuit current at the installation point with the available breaking capacities: 20kA, 25kA, and 31.5kA.
Check whether the breaker will be installed in an outdoor distribution cabinet, box-type substation, bracket structure, or another arrangement. The available installation space and mounting points should be considered at this stage.
After the electrical and mechanical requirements are confirmed, the appropriate ZW32-12 or ZW32-12G configuration can be reviewed according to the project drawings and connection arrangement.
The general outdoor design can be considered for several types of 12kV distribution equipment. The final arrangement depends on the structure and dimensions of the project.
The 12kV Outdoor Vacuum Circuit Breaker can be used as an incoming or outgoing switching device in compatible outdoor distribution cabinet arrangements.
It can form part of the 12kV switching arrangement in outdoor box-type substations when the selected configuration matches the available space and connections.
For installations using an independent outdoor support or bracket structure, the mounting dimensions and connection positions should be checked before model confirmation.
For non-standard outdoor arrangements, available drawings and installation information can be provided for technical review before production.
The 12kV Outdoor Vacuum Circuit Breaker is used in outdoor 12kV distribution systems for circuit switching and fault protection. Its applications cover several types of medium-voltage outdoor electrical installations.
Used on outdoor 12kV distribution lines in rural grid construction, upgrading, and network reconstruction projects.
Applied at outdoor medium-voltage distribution points in urban grid upgrades and replacement projects.
Used in outdoor substations and box-type substations as part of the 12kV incoming or outgoing circuit arrangement.
Installed at 12kV outdoor distribution points serving factories, industrial parks, and other industrial electrical facilities.
Applied at outdoor 12kV distribution points associated with distributed photovoltaic and other renewable energy installations.
Used in retrofit and replacement projects where an existing outdoor vacuum circuit breaker needs to be replaced with a compatible 12kV model.
Dongfa Intelligent does not treat model selection as a voltage-and-current-only decision. For this general outdoor type, the technical review can consider rated current, breaking capacity, mounting arrangement, existing equipment model, and available drawings together before the configuration is confirmed.
Founded in 2012, Zhejiang Dongfa Intelligent Electrical Technology Co., Ltd. has focused on high-voltage electrical equipment for 14 years. Its product range covers vacuum circuit breakers, vacuum load switches, disconnect switches, and related high-voltage electrical components.
The company operates its own factory in Yueqing Economic Development Zone, Wenzhou, Zhejiang, with an area of more than 2,000 m². It has 2 production lines and a monthly production capacity of approximately 600-700 units, with an annual capacity of around 7,000-8,000 units.
The company has 4 technical and R&D personnel who can review product drawings, electrical specifications, mounting requirements, and other technical information supplied for a project.
Dongfa Intelligent's quality management systems include ISO 9001, ISO 14001, and ISO 45001 certifications. Its high-voltage electrical products are manufactured according to applicable GB standards and IEC 62271 requirements. Type test reports from the National High-Voltage Electrical Apparatus Quality Supervision and Inspection Center / Xi'an High-Voltage Apparatus Research Institute are available according to product and project requirements.
For the 12kV Outdoor Vacuum Circuit Breaker, the minimum order quantity is 1 unit. Standard configurations generally require 7-15 working days, while customized configurations generally require 15-30 working days depending on the technical requirements.
Technical questions can receive a response within 1 working day, with after-sales support available within 24 hours.
For replacement projects, please provide the original breaker model, rated current, breaking capacity, mounting dimensions, and available drawings or installation photos. These details help confirm whether the ZW32-12 or ZW32-12G configuration is suitable for the existing installation.
This product is designed as a general outdoor type rather than being limited to one dedicated pole-mounted structure. It can be considered for outdoor distribution cabinets, box-type substations, bracket structures, and other compatible outdoor arrangements.
The required breaking capacity should be selected according to the calculated short-circuit current at the installation point. The available options are 20kA, 25kA, and 31.5kA.
The available rated current configurations are 630A and 1250A. The selection should correspond to the designed circuit load and system requirements.
The two configurations have different structural arrangements. The suitable model should be confirmed according to mounting dimensions, installation structure, and electrical connection requirements.
Yes, it can be considered for replacement and retrofit projects when the electrical and mechanical requirements are compatible. The original model, mounting dimensions, electrical parameters, and available drawings should be provided for technical review.
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No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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