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Huajidian isolation switches are professional electrical isolating devices designed for medium and low voltage power distribution systems. Their primary function is to create a visible isolation point during maintenance, ensuring safe lockout/tagout (LOTO) procedures for electrical personnel. The product range covers voltage ratings from AC 400V low voltage to 33kV medium voltage and complies with IEC 60947-3 and IEC 60265 international standards.

Manufactured by Huajidian's standardized production partners in China, every isolation switch undergoes strict incoming material inspection (IQC), mechanical endurance testing, and comprehensive quality control before shipment. Products are available with CE and IECEx certifications and can be customized to meet various project requirements, including pole configuration, current ratings, mounting methods, and installation accessories.

Huajidian provides complete isolation switch solutions for switchgear, transformers, substations, overhead transmission lines, photovoltaic systems, and industrial power distribution projects worldwide. With outstanding mechanical durability, corrosion-resistant construction, and dependable visible isolation performance, these switches provide long-term operational safety for utilities, EPC contractors, and industrial facilities.

Technical Specifications

• Rated Voltage: AC 400V (Low Voltage), 12kV–33kV (Medium Voltage)
• Rated Current: 16A–6300A
• Mechanical Life: ≥15,000 operating cycles
• Standards: IEC 60947-3, IEC 60265, CE
• Key Advantages: Visible isolation, high mechanical durability, corrosion-resistant contacts, safety interlocking system

Key Features

Visible Blade-Type Isolation Structure

The blade-type contact structure creates a clearly visible air gap after opening, allowing maintenance personnel to verify complete electrical isolation before beginning work. This design fully supports international lockout/tagout (LOTO) safety procedures.

High-Conductivity Silver Alloy Contacts

The contact surfaces are manufactured using silver alloy materials that provide low contact resistance, excellent conductivity, and superior resistance to oxidation and arc erosion, ensuring reliable long-term operation under rated current conditions.

Mechanical Interlocking Protection

Huajidian Isolation Switches can be mechanically interlocked with circuit breakers, preventing operation under load and significantly reducing the risk of operator error during switching procedures.

Flexible Installation Options

Multiple mounting configurations are available, including wall-mounted brackets, switchgear cabinet mounting frames, and pole-mounted hardware, allowing easy integration into various power distribution systems.

Comprehensive Mechanical Endurance Testing

Every production batch undergoes continuous opening and closing cycle testing before leaving the factory to verify operating stability, mechanical reliability, and long service life under repeated switching operations.

Typical Applications

• Medium-voltage switchgear
• Low-voltage distribution panels
• Transformer substations
• Overhead distribution lines
• Industrial power distribution systems
• Photovoltaic combiner boxes
• Battery energy storage systems
• Renewable energy projects
• Utility power networks

Frequently Asked Questions

Can an isolation switch interrupt short-circuit fault current like a vacuum circuit breaker?

No. Isolation switches are not equipped with arc-extinguishing chambers and are designed only for no-load switching. The circuit breaker must first interrupt the fault current before the isolation switch is opened to establish a visible isolation gap for safe maintenance.

Can Huajidian customize DC four-pole isolation switches for photovoltaic systems?

Yes. Huajidian supplies a complete range of AC three-pole, AC four-pole, and DC isolation switches. DC models feature reinforced insulation structures specifically designed for photovoltaic, battery energy storage, and other DC power distribution applications.

What export documentation can Huajidian provide?

Huajidian can provide ISO certification, IEC standard type test reports, CE certificates, technical datasheets, dimensional drawings, and complete documentation packages for international tenders and customs clearance. Technical bid support can also be provided according to local project requirements.