Why Chose Us?
| High Quality | Long Warranty |
| AdvancedEquipment | 24H Online Service |
| Professional Team | Rich Experience |
| Custom Service/Accept ODM/OEMservice | Global Shipping |
| One-stop Solution | Quality Control |
| Competitive Price |
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Why choose us?
A professional manufacturer of vacuum circuit breakers in China, ensuring your use is safe and reliable
Leading Manufacturer & Global Exporter
With decades of expertise in power transmission and distribution, we specialize in designing and manufacturing high-performance vacuum circuit breakers that deliver reliable protection and stable operation across diverse applications worldwide.
Certified Quality Assurance
Our products comply with international standards including IEC 60947, RoHS, CE, GB/T45001/ISO45001, and CCC. Each vacuum circuit breaker undergoes stringent quality control and performance testing to ensure exceptional durability and operational safety.
Strong R&D Capability
Our advanced R&D team, comprising nearly 40 engineers, drives innovation in switchgear technology. With 40+ patents in circuit breaker and switchgear design, we continuously optimize products to meet evolving market demands.
Proven Global Trust
Trusted by partners in utilities, industries, and infrastructure projects, our vacuum circuit breakers are deployed in more than 80 countries. We are proud to deliver proven reliability and contribute to safer, more efficient power systems globally.
How many types High-voltage switches are there?
Grounding Switch (Earthing Switch)
Function: Connects de-energized circuits or equipment to ground to ensure safety during maintenance.
Operation: Used in conjunction with isolating switches to discharge residual or induced voltage.
Key Feature: Protects personnel from electric shock and accidental energization.
Isolating Switch (Disconnector)
Function: Provides a visible and reliable break in the circuit for safe maintenance.
Operation: Works only under no-load conditions.
Key Feature: Ensures complete physical separation of equipment from live parts.
Load Switch (Load Break Switch, LBS)
Function: Opens or closes electrical circuits under normal load conditions.
Operation: Equipped with an arc-extinguishing device to safely interrupt load currents.
Key Feature: Often combined with fuses or circuit breakers to handle short-circuit protection.
What kind of material was used?
Conductive Parts
Copper or Copper Alloys:
Used for main current-carrying contacts and terminals due to their excellent electrical conductivity and low resistance.
Silver or Silver-Plated Surfaces:
Applied on contact points to reduce oxidation, minimize contact resistance, and enhance arc resistance.
Arc-Extinguishing Components
Ceramic, Epoxy Resin, or Arc-Resistant Plastics:
Used in the arc chute or chamber to withstand high temperatures and effectively quench electrical arcs during switching.
SF₆ Gas or Vacuum Medium (in advanced designs):
Acts as an insulating and arc-quenching medium to ensure safe and efficient load interruption.
Insulating Parts
Epoxy Resin, Porcelain, or Composite Insulators:
Provide mechanical strength and electrical insulation between conductive components and grounded structures.
Enclosure and Structural Parts
Galvanized Steel or Stainless Steel:
Used for the outer housing and support frames to ensure mechanical durability, corrosion resistance, and long service life.
Aluminum Alloys (optional):
Employed for lightweight and corrosion-resistant designs, especially in indoor or compact switchgear applications.
How to maintain Load Switch?
Visual Inspection (Quarterly/Before Use)
- External Condition: Look for cracks, corrosion, or physical damage to the enclosure, handle, and viewing window.
- Contacts (if visible): Check for signs of severe arcing, pitting, or overheating (discoloration, melting).
- Terminals & Connections: Look for signs of overheating, loose wires, or corrosion on cable lugs.
- Insulators: Ensure ceramic or other insulating materials are clean, dry, and free of cracks or carbon tracking.
- Mechanical Linkage: Ensure the operating handle is not bent and moves smoothly without excessive force.
Operational Check (Quarterly/Before Use)
- Positive Operation: The switch should snap firmly and cleanly into both the ON and OFF positions. It should not feel loose or grindy.
- Clear Indication: The ON/OFF indicator (often a flag or label) should be clear and accurate.
Electrical Testing (Annually or as per schedule)
Performed by a qualified electrician.
- Contact Resistance Test: Use a low-resistance ohmmeter (micro-ohmmeter) on the closed contacts. High resistance indicates worn contacts that need replacement.
- Insulation Resistance Test: Use a megohmmeter ("Megger") on the de-energized switch with contacts open. Test between phases and from each phase to ground. A low reading indicates poor insulation.
Cleaning & Tightening
- Cleaning: Use a soft, dry cloth. For tougher contamination on contacts, use a specialist electrical contact cleaner. Do not use abrasives like sandpaper on plated contacts.
- Tightening: Check and retighten all terminal connections to the manufacturer's specified torque value using a calibrated torque wrench. Loose connections are a primary cause of failure.
How to Cooperate with Us
Contact Us
Reach out with your inquiry or project requirements via our website, email, or WhatsApp. Our sales engineers will reply within 24 hours with professional support.
Technical Consultation
Our expert team will recommend the most suitable vacuum circuit breaker based on your voltage level, installation environment, and specific application needs.
Quotation & Customization
We offer competitive factory-direct pricing and can tailor product parameters, design, and branding to meet your unique requirements.
Sample Order & Bulk Purchase
Begin with a sample order to evaluate performance and quality before proceeding to mass production or long-term cooperation.
Production & Delivery
Every product undergoes rigorous quality inspection and IEC/ANSI standard testing before shipment, ensuring superior reliability and safety.
After-Sales Support
Enjoy lifelong technical assistance, reliable spare parts supply, and prompt service to keep your equipment operating smoothly.
Frequently Asked Questions
1.Q: What is the primary rule for operating these switches?
A: Always follow strict lockout-tagout procedures to ensure safety.
2.Q: What is a common visual check for all switches?
A: Regularly inspect for signs of damage, overheating, or contamination.
Isolating Switch
3. Q: What is the sole purpose of an isolating switch?
A: To provide a visible air gap and safely isolate a de-energized circuit for maintenance.
4. Q: Can it be operated under load?
A: No, operating an isolating switch under load is extremely dangerous and can cause severe arcing.
5. Q: What is its key mechanical maintenance focus?
A: Ensuring the contacts align properly and the operating mechanism moves smoothly.
Earthing Switch
6. Q: What is the critical function of an earthing switch?
A: To securely ground a de-energized circuit, protecting personnel from accidental re-energization.
7. Q: What is the most important safety pre-condition before closing it?
A: Absolutely confirm the circuit is already fully isolated and de-energized.
8. Q: What is a key electrical test for its performance?
A: Measuring the resistance of the grounding path to ensure it is sufficiently low.
Load Switch
9. Q: How does it differ from an isolating switch?
A: It is specifically designed to safely make and break normal load currents.
10. Q: What is its most critical internal component?
A: The arc extinguishing chamber, which quenches the arc when interrupting current.
11. Q: Can it interrupt high fault currents?
A: No, fault current interruption requires a circuit breaker, not a load break switch.
12. Q: What is a key maintenance task for its mechanism?
A: Regularly check and lubricate the operating mechanism due to its frequent use.
As one of the most professional indoor high-voltage switch manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to wholesale indoor high-voltage switch for sale here from our factory. Contact us for customized design service.