Product Overview
Switchgear-Ready Indoor Vacuum Circuit Breaker from a Professional Factory in China
This indoor 50Hz VS1 vacuum circuit breaker has been designed with switchgear applications in mind. Designed to protect medium voltage circuits through clean arc extinguishing using vacuum technology in conjunction with reliable mechanical operation. This 50Hz VS1 circuit breaker can be used in ambient temperature ranges of -15°C to +40°C and at altitudes of up to 1000 m, making it appropriate for standard indoor switchgear applications.
Applications & circuit protection
The VCB, created for switchgear panels, protects feeders, transformers and motors used in the indoor medium-voltage systems.
- Switchgear panels: Protection of transformers and feeders.
- Power plants: Protection of distribution and auxiliary systems.
- Industrial plants: Protection of motors and feeders.
- Substations: Protection of indoor medium-voltage systems.
Construction & operating reliability
The VS1 vacuum circuit breaker is a combination of vacuum interrupter and a spring mechanism that works in consistent and easily integratable mode in traditional switchgear compartments.
- Vacuum interrupter ensures that the arc is quenched cleanly.
- It offers several ratings in terms of current and breaking capacity.
- The spring mechanism is manually or motor-driven.
- It can be used in normal indoor switchgear.
- The device possesses long life due to multiple operations allowed.
Technical Parameter
| Parameter | Value |
| Rated voltage | 12 kV |
| Rated frequency | 50 Hz |
| Rated current | 630 – 4000 A options |
| Rated short-circuit breaking current | 20 – 40 kA options |
| Ambient temperature | -15°C to +40°C |
| Altitude | ≤1000 m (higher on request) |
| Mounting | Indoor switchgear |
| Standard | IEC 62271 / GB 1984 |
Switchgear Price & Factory Quotation
The cost of switchgear is determined by the type of panel configuration, busbar rating, switching equipment, safety relays, and number of units. As a manufacturer, we give the quote of Indoor Vacuum Circuit Breaker directly from the factory price list along with bulk quantity discounts for distributors and project orders.
- Standard panels based on factory price list
- Custom busbar, relay, or layout project wise
- FOB / CIF terms accepted
Switchgear Wiring & Cable Connection
The package includes busbars, cable connection points, and wiring diagram of the Indoor Vacuum Circuit Breaker panel. The incoming and outgoing cables connect to terminals with proper identification. The secondary wiring is prepared in advance and inspected prior to shipment for both protection and indication.
- Entries prepared according to design
- Secondary wiring tested for accuracy
- Earthing bus and connection points included
Compare Switchgear Configurations
Select the configuration that fits your project:
| Feature | This Panel | Alternative |
| Voltage | As specified | Other MV/LV classes available |
| Current | Per model | Higher or lower rated current |
| Mounting | Fixed / withdrawable per model | Ring main or feeder arrangement |
| Protection | Per project relay scheme | Custom protection functions |
| Best for | Distribution and control | Substation or industrial feeders |
Export Markets & Country Compatibility
The Vacuum Indoor Circuit Breaker is made available to industrial and distribution projects located throughout South Asia, the Middle East, Southeast Asia, Latin America, and Africa. The panels are designed for the refrigerant’s voltage, frequency, and safety standards required by the country where the shipment is sent.
Panel Dimensions, Weight & Packing
The size and weight of the panels depend on the options and the rated capacity. The LV cabinets are usually around 600 – 1000 mm in width, 600 – 1000 deep, and 1800 – 2200 mm in height, while MV panels have sizes according to the switchgear diagram. Approved drawings state sizes and weight of the panels, which are packed in an upright position for transporting.
- Technical drawings contain the data of the size and weight
- Transporting method of the panels is fixed according to the order
- Panels come protected by the busbar
Standards & certifications
The VCB is manufactured in compliance with IEC 62271 and GB 1984 and comes with type test documentation for switchgear and project approval.
- Design standard: IEC 62271 / GB 1984
- Vacuum breaker technology
- Applicable to standard indoor working conditions.
- Breaking capacity tested at defined capacity ratings.
OEM & B2B supply support
Subian Electric is an established power equipment maker and factory supplier that serves switchgear manufacturers with VCB providing, technology support and documentation.
To know details about the ratings and designs of equipment needed, get in touch with us with required switchgear volumes.
- Sample availability for testing.
- Comfortable volumes for OEM switchgear purchases.
- OEM/ODM assistance.
- Customized marking and packaging.
- Technical documentation assistance.
Frequently Asked Questions
What is this VS1 used for?
This term refers to the type of protection coverage for 12kV indoor 50Hz installations and is used in the manufacturing of switchgears.
What ratings are available?
Models with current ratings varying from 630A to 4000A and short circuit rated currents of 20 kA to 40 kA are offered.
What operating conditions does it suit?
Operating temperature range is between -15°C and +40°C and altitude levels not exceeding 1000m with options for extremely high altitudes available.
Do you supply switchgear manufacturers?
Of course, this equipment is manufactured for OEM switchgear companies all over the globe and is sold with all the accompanying specifications and integration documents.
