High-Quality Indoor Vacuum Circuit Breaker

Huajidian Indoor Vacuum Circuit Breakers are withdrawable medium-voltage switchgear designed for use with indoor armored switchgear systems operating from 10kV to 24kV. Featuring a fully encapsulated epoxy resin vacuum interrupter and a modular trolley-type structure, these circuit breakers provide reliable protection for incoming feeders, outgoing feeders, transformer circuits, and distribution systems in enclosed substations.

Manufactured through Huajidian's standardized production partners in China, every indoor vacuum circuit breaker undergoes comprehensive quality control, including IQC, IPQC, and Factory Acceptance Testing (FAT). The products comply with IEC 62271-100, CE, and CB certification standards, ensuring dependable performance for industrial, commercial, and utility applications worldwide.

Huajidian also provides switchgear integration support, parameter selection, engineering consultation, certification assistance, and global logistics services. These circuit breakers are widely used in industrial parks, commercial buildings, data centers, manufacturing facilities, and urban substations throughout Southeast Asia, North America, the Middle East, and other international markets.

Technical Specifications

• Rated Voltage: 12kV / 24kV
• Rated Current: 630A / 1250A / 2000A (customizable)
• Short-Circuit Breaking Capacity: 20kA / 25kA / 31.5kA
• Protection Rating: IP40
• Standards: IEC 62271-100, CE, CB Certification
• Key Advantages: Withdrawable design, compact structure, low operating noise, long maintenance interval, comprehensive safety interlocks

Key Features

Three-Position Mechanical Safety Interlock

The breaker incorporates a three-position interlocking mechanism for service, test, and isolation positions. The system prevents switching operations while the breaker is in the isolation position, eliminating the risk of accidental operation during maintenance and ensuring compliance with international electrical safety standards.

Maintenance-Free Vacuum Interrupter

A fully sealed epoxy resin vacuum interrupter eliminates internal air leakage while delivering excellent arc-extinguishing performance. The maintenance interval can reach up to eight years under normal operating conditions, significantly reducing lifecycle maintenance costs.

Modular Secondary Plug Design

The plug-in secondary wiring connector enables quick installation and replacement without complicated rewiring, reducing switchgear assembly time for EPC contractors and improving maintenance efficiency.

Low-Noise Operation

With an operating noise level of no more than 65 dB, the circuit breaker is suitable for hospitals, office buildings, commercial complexes, and other noise-sensitive indoor environments.

Comprehensive Factory Testing

Every withdrawable circuit breaker undergoes full-load temperature rise testing, operational performance verification, and factory acceptance testing before shipment to ensure consistent product quality and long-term operational reliability.

Typical Applications

• Indoor medium-voltage substations
• Industrial park power distribution systems
• Commercial building substations
• Data center electrical infrastructure
• Manufacturing facilities
• Utility distribution networks
• Transformer protection circuits
• Medium-voltage switchgear panels

Frequently Asked Questions

Which switchgear models are compatible with Huajidian Indoor Vacuum Circuit Breakers?

Standard products are fully compatible with mainstream KYN28A-12 and XGN15-12 medium-voltage armored switchgear. Huajidian also offers customized trolley dimensions based on customer drawings to accommodate non-standard switchgear cabinets.

Can the breaker be equipped with intelligent contact temperature monitoring?

Yes. An optional contact temperature monitoring sensor can be integrated into the vacuum interrupter. The system continuously transmits temperature data to the monitoring platform, enabling early detection of overheating and improving predictive maintenance capabilities.

What is the delivery time for large-volume orders?

Huajidian maintains inventory of semi-finished components for mainstream 12kV models. Standard production orders of up to 500 units can typically be completed within 20 working days after deposit confirmation. Expedited production is also available for urgent EPC and infrastructure projects.