Unlike complete switchgear cabinets, this ZN85C-40.5 40.5kV Indoor Vacuum Circuit Breaker focuses on the core switching function of the power circuit. Its fixed side-mounted structure, modular spring operating mechanism and vacuum interruption technology provide a practical solution for 40.5kV-class indoor applications, including systems where frequent switching operations are required.
The operating mechanism is designed specifically for the characteristics of a 40.5kV vacuum circuit breaker. It adopts a modular spring mechanism installed within the breaker frame, allowing the mechanical output characteristics to match the operating requirements of the vacuum interrupter.
The mechanism is designed around the upper and lower arrangement of the breaker and forms an integrated part of the overall structure. This configuration simplifies the mechanical transmission path while providing a stable basis for closing and opening operations.
The fixed side-mounted configuration is intended for indoor electrical equipment where the breaker is installed as a dedicated switching component. Depending on the project design, configurations such as right outgoing line, top incoming and embedded arrangements can be selected.
Compared with a complete withdrawable switchgear cabinet, this structure allows the project designer to focus on integrating the breaker with the required primary and secondary electrical equipment according to the specific system arrangement.
The closing energy is stored mechanically in the spring mechanism. Energy storage can be completed through the motor or manually with the energy storage handle. During motorized operation, the transmission gear system drives the energy storage shaft and tensions the closing spring until the specified stored-energy position is reached.
After energy storage is completed, the retaining mechanism holds the spring in position and the energy-storage indicator changes to the corresponding status. The auxiliary switch also disconnects the motor power supply when the stored-energy position is reached, leaving the breaker ready for the closing command.
The closing operation can be initiated manually through the closing button or electrically through the control circuit. When the closing electromagnet operates, the stored spring energy is released through the cam and transmission mechanism.
The connecting mechanism then drives the insulated operating rod and moving contact toward the closing position while compressing the contact spring. After the closing stroke is completed, the retaining mechanism maintains the closed position and the auxiliary switch changes accordingly.
Opening can be initiated manually or through an electrical opening command. The opening release mechanism unlocks the closing retainer, allowing the stored energy of the contact and braking springs to separate the vacuum interrupter contacts.
During the final stage of the opening movement, the hydraulic buffer absorbs the remaining mechanical energy and controls the separation position. This coordinated mechanism helps maintain a controlled opening process.
The breaker can be configured with AC or DC operating power according to the project requirements. The supplied configuration includes AC110/220V and DC110/220V options for the closing and opening coils, providing flexibility for different substation and industrial control systems.
The closing coil has a rated power of 288W, while the opening coil is also specified at 288W. The normal operating voltage range is 85%–110% of rated voltage for the closing coil and 65%–120% of rated voltage for the opening coil.
The energy storage motor provides automatic preparation for the next closing operation. The supplied ZYJ220 configuration uses DC220V power with a rated input power of 90W. At the rated operating voltage, the energy storage time is specified as no more than 15 seconds.
This arrangement allows the breaker to restore its stored-energy condition after operation without requiring continuous manual intervention.
The vacuum interrupter is responsible for interrupting the electrical circuit during an opening operation. When the contacts separate, the interruption process takes place inside the vacuum interrupter rather than in an air-insulated switching chamber.
The combination of vacuum interruption and spring-operated mechanical transmission makes the breaker suitable for indoor medium-voltage applications where dependable switching performance and repeated operation are required.
The original design of the ZN85C-40.5 series considers applications requiring frequent switching. Its operating mechanism is matched to the characteristics of the 40.5kV vacuum interrupter, while the motorized energy storage system reduces the need for repeated manual charging.
This makes the equipment suitable for industrial facilities, substations and power plants where switching operations form part of normal electrical system management.
The breaker can be incorporated into indoor power distribution and electrical control systems in power generation facilities, where reliable switching and protection of electrical circuits are required.
In substations, the fixed indoor configuration can be integrated into the corresponding high-voltage electrical system according to the primary circuit arrangement, control scheme and protection requirements.
For industrial and mining facilities with substantial electrical loads, the breaker can provide switching and protection functions in indoor power distribution systems and is suitable for applications requiring regular switching operations.
Because the closing and opening operations can be electrically controlled, the breaker can be integrated with an appropriate secondary control system for local or remote operation according to the project design.
| Item | Specification |
| Model | ZN85C-40.5 |
| Rated voltage | 40.5kV |
| System | Three-phase AC |
| Rated frequency | 50Hz |
| Installation | Indoor |
| Structure | Fixed side-mounted |
| Operating mechanism | Modular spring operating mechanism |
| Energy storage | Motorized / manual |
| Closing operation | Manual / electrical |
| Opening operation | Manual / electrical |
| Closing coil voltage | AC110/220V, DC110/220V |
| Opening coil voltage | AC110/220V, DC110/220V |
| Closing coil power | 288W |
| Opening coil power | 288W |
| Energy storage motor | ZYJ220 |
| Motor rated voltage | DC220V |
| Motor rated input power | 90W |
| Energy storage time | ≤15s |
| Configuration | Right outgoing / top incoming / embedded according to design |
The equipment is intended for indoor installation and should be used in an environment suitable for high-voltage electrical equipment. The final project should consider ambient temperature, humidity, altitude, ventilation and other environmental conditions when determining the complete electrical configuration.
The breaker should be installed in a location without severe vibration, impact or corrosive environmental conditions. The installation arrangement should also ensure sufficient operating and maintenance space around the equipment and maintain the required mechanical alignment of the breaker and associated electrical components.
Zhejiang Usune Electric Co., Ltd. applies an integrated management system covering product quality, environmental management and occupational health and safety. The company holds ISO 9001, ISO 14001 and ISO 45001 certifications, supporting controlled manufacturing processes from component selection through assembly and inspection.
The product is developed according to applicable IEC and GB standards, with electrical parameters and configurations determined according to the specific project requirements. CE certification is also available for the applicable product configuration, providing additional documentation support for international projects.
The ZN85C-40.5 40.5kV Indoor Vacuum Circuit Breaker has been referenced in the Cas-space Rocket Launch Project, providing a practical engineering application example for Usune's high-voltage electrical equipment in a demanding industrial environment.
The ZN85C-40.5 40.5kV Indoor Vacuum Circuit Breaker is primarily a switching and protection component, while a complete withdrawable switchgear panel integrates the breaker with busbars, cable compartments, control equipment, protection devices and other cabinet components. Therefore, the breaker is more suitable when the project requires a dedicated 40.5kV switching device for integration into a larger electrical system.
| Comparison | ZN85C-40.5 Vacuum Circuit Breaker | Withdrawable VCB Switchgear | Low-Voltage Distribution Cabinet |
| Main function | Switching and circuit protection | Complete MV distribution and switching | LV power distribution |
| Voltage class | 40.5kV | Medium voltage | Low voltage |
| Installation | Fixed | Withdrawable | Fixed / withdrawable |
| Main focus | Operating mechanism and interruption | Complete cabinet system | Power distribution |
| Energy storage | Spring mechanism | VCB operating mechanism | Depends on ACB/MCCB configuration |
| Control | Manual / electrical | Local / electrical | Local / electrical |
| Typical application | Power plants, substations, industry | MV distribution systems | Factories, buildings and commercial facilities |
Usune can determine the appropriate configuration according to the customer's single-line diagram, rated voltage, control power, installation arrangement and operating requirements. This approach helps ensure that the selected breaker is compatible with the surrounding primary and secondary electrical equipment.
For projects with special control voltages, installation arrangements or operating requirements, the technical configuration can be discussed before production. This allows the ZN85C-40.5 40.5kV Indoor Vacuum Circuit Breaker to be adapted to the actual electrical system rather than relying on a fixed standard configuration.
It is an indoor 40.5kV vacuum circuit breaker designed for electrical control and protection in power plants, substations, industrial facilities and mining enterprises.
The ZN85C-40.5 uses a fixed side-mounted configuration, rather than a withdrawable trolley structure.
Yes. The spring mechanism supports manual energy storage and manual operation, while electrical operation is also available.
The closing and opening coils can be configured for AC110/220V or DC110/220V according to the project requirements.
The specified energy storage time of the ZYJ220 motor configuration is ≤15 seconds at rated voltage.
Yes. The product is designed for applications requiring frequent operation, subject to the applicable operating conditions and technical configuration.
Yes. Usune can configure the product according to project drawings, electrical parameters, control requirements and installation conditions.
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No. 298, Wei 17th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou City, Zhejiang Province, China
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