It is an indoor switchgear with three-phase AC 50Hz rated voltage of 12KV power system. It is used as protection and control unit for power equipment and industrial and mining enterprises. Applicable to places that require frequent operation at rated operating current, or multiple times to break short-circuit current.
The circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body, and can be used as a fixed installation unit, or can be equipped with a special propulsion mechanism to form a hand truck unit.
small size, light weight, suitable for frequent operation
vacuum interrupter, electromagnetic or spring operating mechanism, bracket and other components.
NO Item Units Technical parameters 1 Rated voltage KV 12 2 Rated short-duration power frequency withstand voltage 42/48(Interphase, ground/fracture) 3 Rated lightning impulse withstand voltage 42/48(Interphase, ground/fracture) 4 Rated frequency Hz 50 5 Rated current A 630 1250 630 1250 16002000 2500 3150 630 1250 16002000 2500 3150 6 Rated short-circuit breaking current KA 20/25 31.5 40 7 Rated short-time withstand voltage 20/25 31.5 40 8 Rated short circuit duration S 4 9 Rated peak withstand current KA 50/63 80 100 10 Rated short circuit closing current 50/63 80 100 11 Secondary circuit power frequency withstand voltage (1min) 2000 12 Rated single / back to back capacitor group breaking current A 630/400(40kA:800/400) 13 Rated capacitor bank closing current 12.5 (frequency is not greater than) 14 Mechanical life KA 20000 15 Rated current breaking times (electrical life) 20000 16 Rated short circuit current breaking times times 50(40KA≤30) 17 Dynamic and static contacts allow wear cumulative thickness mm 3 18 Energy storage time s ≤10 19 Contact opening distance mm 11±1 20 Overtravel 3.5±0.5 21 Contact closing bounce time ms ≤2(40KA≤3) 22 Three-phase split/closed period ≤2 23 Average opening speed (contacts are separated by -8mm) m/s 1.2±0.2 24 Main conductive loop resistance 0.6±0.2 25 Main conductive loop resistance μΩ ≤50(630A)≤45(1250A)≤40 (1600,2000A)≤35 (2500A or more) 26 Rated operation sequence 0-0.3s-Co-180s-Co
The ZN6(VS1) High Voltage Side Mounted vacuum circuit breaker Lateral Fixed Vacuum Circuit Breaker 12KV 1250A is a high-performance medium-voltage switching device designed for industrial substations, power distribution networks, and indoor high-voltage applications. Its side-mounted, lateral fixed design and vacuum interruption technology ensure safe, reliable, and low-maintenance operation.
This guide provides detailed insights into installation steps, structural description, component specifications, and upgrade solutions, making it an essential resource for engineers, operators, and procurement specialists.
Overview of ZN6(VS1) Circuit Breaker
Key Features and Advantages
Installation Steps
Structural Description
Component and Accessory Overview
Upgrade and Modernization Solutions
Operational Guidelines
Maintenance Recommendations
Troubleshooting and Fault Analysis
Technical Specifications
Applications and Use Cases
Conclusion
The ZN6(VS1) integrates switching, isolation, and protection functions in a single unit, specifically for 12KV medium-voltage networks with rated currents up to 1250A. Its vacuum interrupters allow arc-free switching, ensuring long service life and operational safety.
Side-Mounted Installation: Simplifies integration into existing switchgear cabinets.
Lateral Fixed Design: Ensures mechanical stability and reduces movement-related faults.
Vacuum Interruption: High dielectric strength ensures safe load disconnection.
Indoor Application: Compact design suitable for indoor switchgear rooms.
| Feature | Advantage |
|---|---|
| Side-Mounted Design | Easy installation and accessibility |
| Lateral Fixed Configuration | Enhanced mechanical stability |
| Vacuum Interrupters | Arc-free operation and high reliability |
| Rated Current 1250A | Supports medium-voltage industrial networks |
| Compact Indoor Construction | Space-saving and suitable for retrofitting |
| IEC Compliance | Meets international medium-voltage switchgear standards |
| Low Maintenance | Reduced operational downtime |
| High Operational Endurance | Long life cycle and reliability |
Confirm the foundation and cabinet dimensions.
Ensure adequate clearance for access and operation.
Inspect the unit for transportation damage or loose components.
Positioning: Place the breaker in its designated side-mounted location.
Alignment: Ensure the lateral fixed mechanism aligns with the cabinet rails.
Fastening: Secure using anchor bolts or screws as per manufacturer specifications.
Electrical Connections: Connect incoming and outgoing conductors according to wiring diagrams.
Grounding: Install earthing connections per IEC standards.
Pre-Operational Checks: Test mechanical operation and verify interlock functions.
| Step | Status/Notes |
|---|---|
| Cabinet Clearance | Verified |
| Breaker Alignment | Properly aligned |
| Mechanical Fastening | Secured |
| Electrical Wiring | Correct per schematic |
| Grounding/Earthing | Installed and tested |
| Functional Testing | Passed |
The ZN6(VS1) Circuit Breaker consists of several interconnected modules designed for safe and reliable operation.
Vacuum Interrupter Module: Responsible for arc-free current interruption.
Operating Mechanism: Spring or motor-assisted for smooth switching.
Insulated Housing: Provides electrical insulation and mechanical protection.
Contact Assemblies: High-conductivity materials for low resistance and long life.
Control and Indication Panel: Displays breaker status, alarms, and operational data.
| Component | Function | Notes |
|---|---|---|
| Vacuum Interrupter | Interrupts medium-voltage load | Rated for 12KV, 1250A |
| Operating Mechanism | Switches the breaker contacts | Manual or motor-assisted |
| Contact Assemblies | Conduct current and ensure minimal voltage drop | Copper or silver-plated |
| Control Panel | Indicates position and status | LED or analog display |
| Insulated Housing | Protects internal components | Solid insulation material |
| Bushings | Connects to incoming/outgoing lines | Porcelain or composite |
| Grounding System | Ensures safe maintenance | IEC standard compliant |
| Mounting Hardware | Secures breaker in the cabinet | Stainless steel or galvanized |
Install digital position sensors to monitor ON/OFF/GROUND positions.
Integrate with SCADA or PLC systems for remote monitoring.
Upgrade spring mechanisms for faster response and reduced mechanical wear.
Replace contacts with higher-conductivity alloys to improve efficiency.
Add additional interlocks to prevent unSafe Operations.
Integrate alarm systems to indicate malfunctions or maintenance requirements.
ON Position: Circuit energized, normal operation.
OFF Position: Circuit de-energized, breaker isolated.
GROUND Position: Circuit safely grounded for maintenance.
Use the manual handle or operating mechanism to change positions.
Verify all interlocks and indicators function correctly before operation.
Connect breaker to automated control systems.
Confirm control signal accuracy and breaker response.
Test remote operations before energizing.
Regular maintenance ensures safe, reliable, and long-term performance.
| Task | Frequency | Description |
|---|---|---|
| Visual Inspection | Monthly | Check for dust, corrosion, or damage |
| Mechanical Operation Test | Quarterly | Ensure smooth opening/closing |
| Contact Surface Inspection | Bi-Annually | Clean and check for wear |
| Lubrication of Moving Parts | Bi-Annually | Prevent mechanical wear and binding |
| Insulation Resistance Measurement | Annually | Detect insulation degradation |
Keep components clean and dry.
Tighten all electrical connections.
Test interlocks and safety mechanisms regularly.
Avoid exposure to extreme temperature or humidity.
| Issue | Possible Cause | Recommended Action |
|---|---|---|
| Breaker fails to operate | Mechanical blockage or misalignment | Inspect and adjust mechanism |
| Trip failure | Faulty control circuit or sensor | Test and replace sensor or wiring |
| Abnormal voltage/current | Loose connections or worn contacts | Tighten or replace connections |
| Excessive noise during operation | Worn moving parts | Lubricate or replace components |
| Failure to trip under fault | Malfunctioning vacuum interrupter | Replace or service vacuum interrupter |
| Specification | Parameter |
|---|---|
| Rated Voltage | 12 kV |
| Rated Current | 1250 A |
| Short-Circuit Breaking Capacity | 25 kA |
| Insulation Level | IEC 62271 standard |
| Operating Mechanism | Manual, spring-assisted, or motor |
| Ambient Temperature | -10°C to +40°C |
| Relative Humidity | ≤95% |
| Protection Grade | IP20 / IP30 |
Indoor Substations: Provides reliable medium-voltage protection.
Industrial Facilities: Ensures safe operation and load control.
Utility Networks: Integrates with 12KV distribution lines.
Renewable Energy Systems: Protects wind, solar, and hybrid networks.
The ZN6(VS1) High Voltage Side Mounted Vacuum Circuit Breaker Lateral Fixed Vacuum Circuit Breaker 12KV 1250A is a robust, reliable, and IEC-compliant medium-voltage solution. With side-mounted installation, lateral fixed design, and vacuum interruption, it ensures safety, operational continuity, and low maintenance requirements. Proper installation, testing, and periodic maintenance are essential for optimal performance.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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