Dongfa Intelligent is a China-based manufacturer of the 24kV Outdoor Pole-Mounted Vacuum Circuit Breaker, designed around the insulation and switching requirements of 24kV outdoor distribution systems. With a 630A rated current and 20kA short-circuit breaking capacity, it provides 65/79kV power-frequency withstand and 125/145kV lightning impulse withstand. The configuration is suited to outdoor distribution projects where insulation coordination and pole-mounted installation need to be confirmed together.
Moving from 12kV to 24kV requires more than changing the rated voltage. The insulation system, clearances, and withstand levels must be matched to the higher operating voltage. This breaker is configured specifically for 24kV, 50Hz outdoor distribution systems, with separate withstand values for the phase-to-earth insulation and interrupter gap.
The breaker provides 65kV power-frequency withstand for phase-to-earth insulation and 79kV across the interrupter gap. These values provide the basic insulation parameters for evaluating the breaker against the requirements of a 24kV distribution system.
For impulse conditions, the rated withstand is 125kV for phase-to-earth insulation and 145kV across the interrupter gap. This distinction is important when checking insulation coordination for outdoor installations exposed to switching and atmospheric overvoltage conditions.
| Parameter | Specification |
| Product Type | Outdoor Pole-Mounted Vacuum Circuit Breaker |
| Rated Voltage | 24kV |
| Rated Frequency | 50Hz |
| Rated Current | 630A |
| Rated Short-Circuit Breaking Current | 20kA |
| Rated Short-Time Withstand Current | 20kA |
| Rated Peak Withstand Current | 50kA |
| Rated Short-Circuit Making Current | 50kA |
| Power-Frequency Withstand Voltage | 65kV / 79kV |
| Lightning Impulse Withstand Voltage | 125kV / 145kV |
| Secondary Circuit Power-Frequency Withstand | 2kV |
| Mechanical Life | 10,000 operations |
| Short-Circuit Breaking Operations | ≥30 |
| Installation | Outdoor pole-mounted |
For the 24kV Outdoor Pole-Mounted Vacuum Circuit Breaker, electrical selection should start with the system voltage and fault level rather than the physical dimensions alone. The following parameters should be confirmed before the equipment is ordered.
The rated voltage is 24kV and should correspond to the distribution system where the breaker will be installed.
The rated current is 630A. This value should be checked against the continuous operating current of the circuit.
The rated short-circuit breaking current is 20kA, with a 50kA rated peak withstand current and 50kA rated short-circuit making current. These values should be compared with the calculated fault level of the installation.
The specified mechanical life is 10,000 operations, while the short-circuit breaking operation requirement is ≥30. Actual service intervals depend on switching frequency, fault interruption, and operating environment.
As a pole-mounted breaker, the equipment must be matched not only to electrical parameters but also to the existing outdoor support and connection arrangement. This is particularly important for replacement projects where the new breaker needs to interface with an existing pole structure, control system, and electrical connection.
The 24kV Outdoor Pole-Mounted Vacuum Circuit Breaker can be used for outdoor circuit switching and short-circuit fault interruption in 24kV distribution networks. Its configuration is relevant to projects where a higher-voltage outdoor distribution level is required.
Dongfa Intelligent has supplied high-voltage electrical products to Southeast Asia and parts of Europe, with applications including power utilities, power plants, and mining projects.
Dongfa Intelligent manufactures the 24kV Outdoor Pole-Mounted Vacuum Circuit Breaker according to applicable GB and IEC requirements. Its quality management system is certified to ISO 9001, ISO 14001, and ISO 45001, with CNAS and IAF recognition associated with the certification system.
Key high-voltage product lines have undergone type testing by the National High-Voltage Electrical Apparatus Quality Supervision and Inspection Center (Xi'an High-Voltage Apparatus Research Institute). Factory inspection includes resistance testing, mechanical operation testing, power-frequency withstand voltage testing, and vacuum degree inspection.
Zhejiang Dongfa Intelligent Electrical Technology Co., Ltd. was founded in 2012 and operates its own factory in Yueqing Economic Development Zone, Wenzhou, Zhejiang, China. The factory covers more than 2,000m² and has 17 employees, including 4 technical and R&D personnel. Two production lines support a monthly capacity of approximately 600-700 units and an annual capacity of around 7,000-8,000 units.
For replacement projects, compatibility should be checked before production. Please provide the original breaker model, mounting dimension drawings, electrical parameters, control requirements, and required quantity. The technical team can review the information and confirm the proposed configuration.
| Item | Standard Arrangement |
| MOQ | 1 unit for standard products |
| Standard Lead Time | 7-15 working days |
| Customized Lead Time | 15-30 working days |
| OEM/ODM | Available according to drawings and technical requirements |
| Technical Response | Within 1 working day |
| After-Sales Response | Within 24 hours |
The main difference is the voltage and corresponding insulation requirements. The 24kV Outdoor Pole-Mounted Vacuum Circuit Breaker provides 65/79kV power-frequency withstand and 125/145kV lightning impulse withstand, which are configured for the higher insulation requirements of a 24kV system.
The standard configuration provides 630A rated current and 20kA rated short-circuit breaking current. The rated peak withstand current and short-circuit making current are both 50kA.
Please provide the original breaker model, mounting dimensions, electrical parameters, control requirements, and quantity. Drawings are recommended when replacing equipment installed on an existing pole structure.
Relevant technical documents may include product specifications, inspection records, mounting dimension drawings, and applicable type test documentation. Specific documents can be confirmed according to the project requirements.
Yes. The standard MOQ for the 24kV Outdoor Pole-Mounted Vacuum Circuit Breaker is 1 unit. Standard products generally require 7-15 working days, while customized products generally require 15-30 working days.
For product selection, please provide the rated voltage, rated current, short-circuit breaking current, installation arrangement, application conditions, and required quantity. For replacement projects, including the original model and mounting drawing will help confirm compatibility more efficiently.
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No. 281, Wei 18th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
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