VCB(VS1)-12 type indoor high VCB, is a three-phase ac 50Hz rated voltage of 12kV power system indoor switch equipment, as power grid equipment, industrial and mining enterprise power equipment protection and control unit. It is suitable for frequent operation under the rated working current, or the place where short-circuit current is turned on multiple times.
The circuit breaker is designed with operating mechanism and circuit breaker body. which can be used as a fixed installation unit, and it can also be equipped with a special propulsion mechanism.
| 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 12KV Indoor High Voltage Handcart Type vacuum circuit breaker (VCB) ZN63(VS1)-12 is a high-performance medium-voltage switching device widely used in industrial substations, power distribution networks, and indoor high-voltage applications. Its handcart design allows for easy insertion, withdrawal, and maintenance, while the vacuum interruption technology ensures safe and reliable operation.
This comprehensive guide covers product certifications, after-sales support, operational procedures, and safety protocols, making it essential for engineers, operators, and procurement professionals.
Product Overview
Key Features and Advantages
Product Certifications
Installation and Operation Guidelines
Handcart Operation Instructions
Safety Operation Procedures
After-Sales Service and Support
Maintenance and Troubleshooting
Technical Specifications
Applications and Use Cases
Conclusion
The ZN63(VS1)-12 Vacuum Circuit Breaker is designed for indoor medium-voltage networks with a rated voltage of 12KV and a rated current up to 1250A. It combines arc-free vacuum interruption, a compact handcart design, and IEC compliance, providing a reliable, safe, and low-maintenance solution for industrial and utility applications.
Handcart Design: Enables easy installation, removal, and replacement.
Vacuum Interruption: Provides high dielectric strength and arc-free switching.
Indoor Construction: Compact, space-saving, suitable for retrofitting.
Operational Flexibility: Manual or motor-assisted operation options.
| Feature | Advantage |
|---|---|
| Handcart Type Design | Simplifies installation and withdrawal |
| Vacuum Interrupter | Provides safe, arc-free switching |
| Rated Voltage 12KV | Suitable for medium-voltage networks |
| Rated Current 1250A | Supports industrial and utility loads |
| Compact Indoor Design | Space-saving for substations |
| IEC Compliance | Meets international medium-voltage switchgear standards |
| Low Maintenance Requirements | Reduced downtime and operational cost |
| Operational Endurance | Long service life and high reliability |
The ZN63(VS1)-12 VCB complies with international standards to ensure safety, reliability, and interoperability.
| Certification | Description |
|---|---|
| IEC 62271-100 | High-voltage switchgear and controlgear standards |
| ISO 9001 | Quality management system compliance |
| CE Marking | Conformity with European safety standards |
| RoHS | Restriction of hazardous substances |
| UL Certification | Optional certification for international markets |
These certifications guarantee operational safety, long-term reliability, and international compliance, making the VCB suitable for global distribution networks.
Verify foundation stability and cabinet dimensions.
Ensure adequate clearance around the breaker.
Inspect transportation conditions for damage or loose components.
Position the breaker in its designated indoor switchgear cabinet.
Align the handcart rails with cabinet guides.
Secure using mounting bolts as per manufacturer instructions.
Connect incoming and outgoing conductors according to wiring diagrams.
Ensure proper grounding/earthing.
Conduct mechanical and electrical pre-operation tests.
| Step | Status/Notes |
|---|---|
| Cabinet Clearance | Verified |
| Breaker Alignment | Correct alignment |
| Mechanical Fastening | Secured |
| Electrical Wiring | Checked against schematic |
| Grounding/Earthing | Installed and tested |
| Pre-Operational Testing | Completed |
The handcart design allows the VCB to be easily inserted or withdrawn for maintenance or replacement.
Ensure the breaker is in the OFF position.
Align handcart rails with cabinet guides.
Slide the breaker slowly into position.
Lock handcart using the mechanical latch.
Verify electrical connections and indicators.
Switch the breaker to the OFF and GROUND positions.
Unlock the handcart latch.
Carefully withdraw the breaker from the cabinet.
Store the unit in a designated safe location.
Safety is critical when operating the ZN63(VS1)-12 VCB. Follow these protocols:
Confirm OFF position before maintenance.
Never bypass interlocks or safety devices.
Wear personal protective equipment (PPE): gloves, helmets, and insulated boots.
Verify grounding before accessing internal components.
Conduct routine inspections for wear, dust, and loose connections.
Maintain a log of operations and inspections.
Reliable after-sales service ensures long-term performance and customer satisfaction.
| Service Type | Description |
|---|---|
| Technical Consultation | Expert guidance on installation and operation |
| Spare Parts Supply | OEM parts for maintenance and replacements |
| Field Service and Commissioning | On-site setup and functional testing |
| Preventive Maintenance Programs | Scheduled inspections and servicing |
| Remote Support | Troubleshooting via online assistance |
Customer support is available globally, ensuring rapid response to technical issues and operational guidance.
| Task | Frequency | Description |
|---|---|---|
| Visual Inspection | Monthly | Check for dust, corrosion, or damage |
| Mechanical Operation Test | Quarterly | Ensure smooth insertion/withdrawal |
| Contact Surface Inspection | Bi-Annually | Clean and check for wear |
| Lubrication of Moving Parts | Bi-Annually | Prevent mechanical wear |
| Insulation Resistance Test | Annually | Detect insulation degradation |
| Issue | Possible Cause | Recommended Action |
|---|---|---|
| Breaker fails to operate | Misalignment or mechanical blockage | Inspect and adjust |
| Failure to trip | Faulty control circuit or sensor | Replace or repair sensor |
| Abnormal noise during operation | Worn moving parts | Lubricate or replace components |
| Loose electrical connection | Vibration or thermal expansion | Tighten connections |
| Trip without load | Control wiring or mechanism fault | Check and repair wiring or mechanism |
| Specification | Parameter |
|---|---|
| Rated Voltage | 12 kV |
| Rated Current | 630–1250 A |
| Short-Circuit Breaking Capacity | 25 kA |
| Insulation Level | IEC 62271 Standard |
| Operating Mechanism | Manual or spring-assisted |
| Handcart Type | Easy insertion/withdrawal |
| Ambient Temperature | -10°C to +40°C |
| Relative Humidity | ≤95% |
| Protection Grade | IP20/IP30 |
Indoor Substations: Reliable medium-voltage protection.
Industrial Facilities: Safe load switching and operational continuity.
Utility Networks: Integrates with 12KV indoor distribution lines.
Renewable Energy Systems: Protects solar, wind, and hybrid networks.
Commercial Complexes: Ensures uninterrupted power supply.
The 12KV Indoor High Voltage Handcart Type Vacuum Circuit Breaker VCB ZN63(VS1)-12 provides robust, safe, and IEC-compliant medium-voltage switching. With handcart operation, vacuum interruption, and low maintenance requirements, it is ideal for industrial, utility, and indoor substation applications. Following installation, operation, safety, and maintenance protocols ensures long-term reliability and operational safety.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
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