Dongfa Intelligent supplies 12kV Indoor Vacuum Circuit Breakers, critical switching equipment for indoor medium voltage distribution to make, break and interrupt fault currents. Built for 12kV, 50Hz power networks, the ZN63(VS1)-12 suits power utilities, power plants, mines and industrial sites, with flexible fixed or withdrawable mounting. Engineers select specifications from its 630A–4000A rated current and 20–40kA short-circuit breaking range while checking insulation, mechanical endurance and compatibility with existing switchgear to match project system requirements.
For power engineering contractors, switchgear manufacturers, and equipment procurement teams, rated current is a fundamental parameter when selecting circuit breakers. ZN63(VS1)-12 offers:
Multiple current ratings cover medium-voltage distribution needs of different load levels, allowing specification selection based on project design capacity rather than being limited by a single rating.
When a short-circuit fault occurs, the circuit breaker needs to reliably interrupt the fault current. The rated short-circuit breaking current of ZN63(VS1)-12 includes:
Up to 40kA. This allows the product to be matched to specifications for medium-voltage power distribution systems with different short-circuit current levels. For applications with high continuous operation requirements, such as power facilities, industrial production systems, mines, and power plants, a reasonable short-circuit breaking capacity is one of the key conditions for ensuring the normal operation of medium-voltage switchgear.
The rated mechanical life of ZN63(VS1)-12 reaches:
For medium-voltage switchgear operating for extended periods, the circuit breaker does not perform only a single opening and closing operation. Equipment may require multiple mechanical actions during normal operation, system switching, maintenance, and fault protection.
Product rated insulation levels include:
Clear insulation performance parameters help engineers verify electrical specifications during the project design phase.
For 12kV medium-voltage systems, in addition to the rated voltage, the insulation level is also an important technical basis for evaluating whether a circuit breaker is suitable for a specific system. Therefore, it is recommended to comprehensively confirm the system insulation requirements, installation environment, and matching switchgear during procurement.
Two structures to meet different switchgear configurations. The 12kV Indoor Vacuum Circuit Breaker is available in both fixed and withdrawable types.
The fixed type is suitable for corresponding fixed installation schemes, with the product directly installed inside the switchgear. For indoor medium-voltage power distribution systems with a well-defined structure and fixed equipment layout, the fixed type offers a clear installation method.
The withdrawable type is equipped with a movable base, facilitating the pushing and pulling of the circuit breaker within the corresponding switchgear. It is more suitable for projects requiring ease of inspection, maintenance, and equipment replacement.
When submitting an inquiry, provide the switchgear model, rated current, short-circuit breaking capacity, and installation dimensions. This will allow for more accurate confirmation of the circuit breaker configuration.
| Parameter Items | Technical Specifications |
| Product | 12kV Indoor Vacuum Circuit Breaker |
| Model | ZN63(VS1)-12 |
| Rated Voltage | 12kV |
| Rated Frequency | 50Hz |
| Power-Frequency Withstand Voltage, 1 min | 42kV |
| Lightning Impulse Withstand Voltage | 75kV |
| Rated Current | 630 / 1250 / 1600 / 2000 / 2500 / 3150 / 4000A |
| Rated Short-Circuit Breaking Current | 20 / 25 / 31.5 / 40kA |
| Rated Short-Time Withstand Current | 20 / 25 / 31.5 / 40kA |
| Rated Short-Circuit Making Current | 50 / 63 / 80 / 100kA |
| Rated Peak Withstand Current | 50 / 63 / 80 / 100kA |
| Rated Short-Circuit Duration | 4s |
| Mechanical Life | 10,000 operations |
| Rated Single Capacitor Bank Breaking Current | 630A |
| Rated Back-to-Back Capacitor Bank Breaking Current | 400A |
| Out-of-Phase Ground Fault Breaking Current | 27.4A |
| Allowable Cumulative Contact Wear | 3mm |
| Installation Type | Fixed / Withdrawable |
| Applicable Standard | GB/T 1984 |
Providing medium-voltage circuit breaking solutions for power and industrial users. The 12kV Indoor Vacuum Circuit Breaker is primarily designed for indoor medium-voltage power distribution environments, suitable for projects with specific requirements for circuit control and fault breaking.
It can be used for breaking and protecting medium-voltage power distribution lines, providing corresponding equipment support for power distribution systems.
It can be applied to power plants and related medium-voltage power distribution equipment. The appropriate rated current and short-circuit breaking capacity can be selected based on the system's rated parameters.
Mining production typically requires a relatively stable power supply; therefore, medium-voltage power distribution equipment needs to focus on equipment reliability, fault protection, and ease of maintenance. ZN63(VS1)-12 can be selected according to project requirements.
Suitable for power supply to industrial plants, production equipment, and internal medium-voltage power distribution systems. The appropriate configuration can be selected based on the actual load and system short-circuit level.
Established in 2012, Dongfa specializes in high-voltage electrical equipment and related products.
The company has 17 employees, including 4 R&D and technical personnel, supporting product development and technical communication.
The factory covers more than 2,000 m² and operates 2 production lines with one set of testing equipment.
Product series cover 12kV, 24kV, and 40.5kV applications, including vacuum circuit breakers, load switches, disconnect switches, and high-voltage coils.
The company is certified to ISO 9001, ISO 14001, and ISO 45001 and follows applicable GB and IEC standards.
Products have undergone type testing by the National High Voltage Electrical Apparatus Quality Supervision and Inspection Center.
Products have been exported to Southeast Asia and parts of Europe and applied in power companies, power plants, mines, and industrial projects.
Product configurations can be developed according to customer drawings, technical parameters, and specific application requirements.
Before procurement of 12kV vacuum circuit breakers, it is recommended to confirm the following:
This checklist helps prepare inquiry materials and reduces communication costs from repeated confirmation of basic parameters.
A 12kV Indoor Vacuum Circuit Breaker is mainly used in 12kV indoor medium-voltage power distribution systems, undertaking functions such as circuit connection, disconnection, and fault current interruption.
The ZN63(VS1)-12 is available in rated currents of 630A, 1250A, 1600A, 2000A, 2500A, 3150A, and 4000A. Specific configurations will be determined based on project requirements.
20kA, 25kA, 31.5kA, and 40kA ratings.
Yes. This product is available in both fixed and withdrawable types, selectable according to different indoor switchgear solutions.
The product has a rated mechanical life of 10,000 operations.
According to the currently provided product information, the ZN63(VS1)-12 is compatible with the standard GB/T 1984.
Whether it can be directly matched needs to be confirmed based on the original switchgear model, installation dimensions, phase-to-phase center distance, stationary contact dimensions, and related electrical parameters. It is recommended to provide switchgear technical data for matching before procurement.
Yes. For bulk procurement or engineering projects, provide information such as rated current, short-circuit breaking capacity, fixed/withdrawable requirements, switchgear model and dimensions, etc., so that Dongfa can further confirm the product configuration.
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