Dongfa Intelligent is a China-based manufacturer of the 40.5kV Outdoor Pole-Mounted Vacuum Circuit Breaker, developed for outdoor distribution systems requiring 50Hz or 60Hz operation. The breaker combines 1250A/1600A rated current with 31.5kA short-circuit breaking capacity, DC220V mechanism control, and a stainless steel control cabinet. Its operating cycle and electrical parameters are configured for 40.5kV distribution applications where switching, protection, and control requirements need to be considered together.
The breaker supports both 50Hz and 60Hz power systems, making frequency confirmation an important part of product selection for overseas projects. This configuration can be matched to distribution systems using either frequency while maintaining the same 40.5kV voltage class.
The rated short-circuit breaking current reaches 31.5kA. The rated short-circuit making current and peak withstand current are both 80kA, while the 4s short-time withstand current is 31.5kA. These parameters should be checked against the calculated fault level of the installation.
The rated operating cycle is O-0.1s-CO-3s-CO-6s-CO-60s Recovery. This sequence is intended for distribution lines using automatic reclosing. The breaker operating cycle should be checked against the protection device and reclosing logic before final selection.
The 40.5kV Outdoor Pole-Mounted Vacuum Circuit Breaker is supplied with a stainless steel control cabinet for mechanism control and secondary circuit arrangement. Combining the breaker and control cabinet provides a more complete outdoor switching configuration, particularly where the primary equipment and control components need to be installed together.
The specified mechanical life reaches 20,000 operations, with 30 rated short-circuit breaking operations. This configuration is intended for outdoor distribution applications involving repeated switching and protection actions.
| Parameter | Specification |
| Product Type | Outdoor Pole-Mounted Vacuum Circuit Breaker |
| Rated Voltage | 40.5kV |
| Rated Frequency | 50Hz / 60Hz |
| Rated Current | 1250A / 1600A |
| Rated Short-Circuit Breaking Current | 31.5kA |
| Rated Short-Circuit Making Current (Peak) | 80kA |
| Rated Peak Withstand Current | 80kA |
| 4s Short-Time Withstand Current | 31.5kA |
| Power-Frequency Withstand Voltage | 80kV / 95kV |
| Lightning Impulse Withstand Voltage | 185kV |
| Rated Operating Cycle | O-0.1s-CO-3s-CO-6s-CO-60s Recovery |
| Rated Short-Circuit Breaking Operations | 30 |
| Mechanical Life | 20,000 operations |
| Mechanism Control Voltage | DC220V |
| Secondary Circuit 1min Power-Frequency Withstand | 2kV |
| Installation | Outdoor pole-mounted, with control cabinet |
For this 40.5kV configuration, the control cabinet is part of the overall equipment arrangement rather than a separate detail to be considered after the breaker has been selected. The cabinet provides the mechanism control and secondary circuit interface required for the outdoor breaker.
The 40.5kV Outdoor Pole-Mounted Vacuum Circuit Breaker performs the primary switching and fault interruption function, while the control cabinet accommodates the associated control and secondary circuits. Their installation positions should be considered together when planning the outdoor switching point.
The control cabinet uses a stainless steel enclosure for outdoor installation. Cabinet dimensions, mounting position, cable routing, and connection requirements should be confirmed according to the project layout.
The standard mechanism control voltage is DC220V. If the existing protection or control system uses another voltage, this requirement should be identified during technical selection rather than after equipment production.
The operating sequence of a circuit breaker needs to correspond with the protection logic of the distribution line. For this product, the specified sequence is O-0.1s-CO-3s-CO-6s-CO-60s Recovery.
| Stage | Sequence |
| Initial opening | O |
| First reclosing interval | 0.1s |
| Subsequent switching | CO |
| Next reclosing interval | 3s |
| Further reclosing interval | 6s |
| Recovery interval | 60s |
This operating cycle should be reviewed together with the automatic reclosing settings of the protection device. The required sequence should be confirmed during technical selection for projects where reclosing is part of the line protection strategy.
System frequency is one of the first technical details to confirm when selecting 40.5kV outdoor equipment for overseas projects. This breaker supports both 50Hz and 60Hz systems, allowing the configuration to be considered for projects operating under different grid frequencies.
For a 50Hz project, the system frequency should be confirmed together with the rated voltage, current, fault level, control voltage, and protection requirements.
For a 60Hz project, the same electrical selection process applies, with the project frequency specified during inquiry so that the product configuration can be confirmed before production. The dual-frequency configuration is particularly relevant to export projects where equipment specifications may vary between target countries.
Selection of the 40.5kV Outdoor Pole-Mounted Vacuum Circuit Breaker should consider the complete operating system rather than the rated voltage alone.
For replacement projects, the original breaker model, mounting dimensions, control circuit information, and cabinet arrangement should also be provided for compatibility review.
For 40.5kV Outdoor Pole-Mounted Vacuum Circuit Breaker, manufacturing control focuses on the electrical and mechanical conditions that directly affect switching performance. Dongfa Intelligent checks the relevant product characteristics through resistance testing, mechanical operation testing, power-frequency withstand testing, and vacuum degree inspection.
The electrical inspection process covers resistance and power-frequency withstand requirements before the equipment is released. These checks are used to verify the product against its specified electrical parameters.
The operating mechanism is checked through mechanical operation testing. For a breaker specified with a 20,000-operation mechanical life, mechanical performance is an important part of the product inspection process.
Vacuum degree inspection is included in the product inspection process to check the vacuum condition of the interrupter before shipment.
The 40.5kV Outdoor Pole-Mounted Vacuum Circuit Breaker is manufactured according to applicable GB and IEC requirements, including the relevant requirements of IEC 62271. Dongfa Intelligent's quality management system is certified to ISO 9001, ISO 14001, and ISO 45001.
Type test documentation from the National High-Voltage Electrical Apparatus Quality Supervision and Inspection Center (Xi'an High-Voltage Apparatus Research Institute) can be provided according to project requirements.
The available rated current options are 1250A and 1600A. The rated short-circuit breaking current is 31.5kA.
The stainless steel control cabinet provides the mechanism control and secondary circuit arrangement associated with the outdoor breaker. Its installation position and connections should be confirmed according to the project layout.
The standard mechanism control voltage is DC220V. Other control voltage requirements can be reviewed according to the project specifications.
The specified operating cycle is O-0.1s-CO-3s-CO-6s-CO-60s Recovery. It should be checked against the automatic reclosing and protection logic of the distribution system.
Yes. The 40.5kV Outdoor Pole-Mounted Vacuum Circuit Breaker supports both 50Hz and 60Hz systems. The required frequency should be specified during technical selection.
The specified mechanical life is 20,000 operations, with 30 rated short-circuit breaking operations.
Please provide the original breaker model, mounting dimensions, electrical parameters, system frequency, control voltage, control cabinet requirements, and quantity. These details help confirm compatibility before production.
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