12kV Indoor Three-Position Vacuum Circuit Breaker

Dongfa Intelligent is a China-based manufacturer of the 12kV Indoor Three-Position Vacuum Circuit Breaker for indoor 12kV, 50Hz switchgear. The three-position design combines circuit breaking, isolation, and earthing functions, helping reduce cabinet components and simplify interlocking. Selection should consider rated current, breaking current, insulation level, mounting interface, and switchgear requirements.

Product Core Advantages

Three-Position Integrated Design

Combines circuit breaking, isolation, and earthing functions in one operating arrangement, reducing the number of separate components required inside the switchgear and simplifying the interlocking structure.

Flexible Electrical Configuration

The 12kV Indoor Three-Position Vacuum Circuit Breaker is available with 630A or 1250A rated current and 20kA, 25kA, or 31.5kA short-circuit breaking capacity, allowing the configuration to be matched with different 12kV indoor switchgear requirements.

Defined Insulation Levels

The insulation system provides 42/48kV power-frequency withstand voltage and 75/85kV lightning impulse withstand voltage for 12kV indoor high-voltage applications.

Adaptable to New and Replacement Switchgear

The installation arrangement can be confirmed according to the switchgear structure and project requirements. For replacement applications, the original breaker model, switchgear model, installation drawings, and interlocking requirements can be reviewed before configuration.

Technical Specifications

Installation and Selection

Switchgear Integration

The 12kV Indoor Three-Position Vacuum Circuit Breaker is configured for indoor switchgear according to the cabinet structure, mounting position, operating direction, and electrical requirements. The specific three-position arrangement should be confirmed during technical selection.

Replacement Project Requirements

For replacement or retrofit projects, the original breaker model, switchgear model, installation drawings, main electrical parameters, and existing interlocking requirements should be provided for technical confirmation.

Technical Response

Dongfa Intelligent can review the supplied technical information and provide configuration guidance within 1 working day.

Applications

The 12kV Indoor Three-Position Vacuum Circuit Breaker is used in indoor medium-voltage switchgear applications, including:

• Substation medium-voltage distribution systems
• Industrial and mining power distribution
• Renewable energy step-up systems
• Large commercial building power systems
• Existing switchgear replacement and retrofit projects

Company Strength

14 Years in High-Voltage Electrical Manufacturing

The company operates its own factory in Yueqing Economic Development Zone, Wenzhou, Zhejiang, with more than 2,000 m² of production space.

Production and Technical Team

Dongfa Intelligent has 17 employees, including 4 technical and R&D personnel. The factory operates 2 production lines with a monthly production capacity of approximately 600-700 units and an annual capacity of approximately 7,000-8,000 units.

Quality and Testing System

The company operates under ISO 9001, ISO 14001, and ISO 45001 management systems, with relevant CNAS and IAF recognition. Products are developed and tested according to applicable GB standards and IEC 62271 requirements. Testing includes resistance, mechanical operation, withstand voltage, and vacuum inspection.

FAQ

Can this three-position vacuum circuit breaker be customized?

Yes. Dongfa Intelligent supports OEM/ODM production based on customer drawings, technical specifications, nameplate requirements, packaging, and manuals.

What information is required for a custom three-position VCB?

Customers can provide the switchgear model, installation drawings, rated current, breaking current, insulation requirements, and three-position interlocking requirements for technical confirmation.

What tests are performed before delivery?

Testing includes resistance, mechanical operation, withstand voltage, and vacuum inspection before delivery.

What is the MOQ for this vacuum circuit breaker?

For the 12kV Indoor Three-Position Vacuum Circuit Breaker, one unit is acceptable for standard products. OEM orders can be discussed according to the project requirements.

What is the delivery time?

7-15 working days, while customized orders generally require 15-30 working days.

Can you provide technical support for switchgear integration?

Yes. Dongfa Intelligent provides technical support for product selection and switchgear integration, with a technical response within 1 working day after receiving the required project information.

Technical Inquiry

Please provide the required rated current, breaking capacity, switchgear model, installation drawings, or existing breaker information when requesting this 12kV Indoor Three-Position Vacuum Circuit Breaker. Dongfa Intelligent can review the application requirements and confirm a suitable configuration.