Overview
The ZN63 (VS1)-12kV Indoor High Voltage Vacuum Circuit Breaker is a three-phase AC 50Hz switchgear device rated at 12kV, engineered for reliable control and protection in industrial plants, mining operations, power stations, and substations. It excels in applications requiring frequent switching and offers high operational safety and performance. The breaker integrates the VET spring-operated mechanism directly with the vacuum interrupter assembly, enabling compact construction and efficient operation. It supports both fixed installation and handcart configurations when paired with an advancement mechanism, ensuring flexibility across diverse switchgear systems.
Featuring a solid-sealed post design, the ZN63 (VS1)-12 delivers a maintenance-free, pollution-resistant, and explosion-proof solution with superior insulation performance. Its compatibility with KYN28A-12 (GZS) and XGN switchgear panels enhances system integration. Built for modern power distribution networks, it combines high reliability, long service life, and environmental resilience to meet demanding operational requirements.
Model Designation
- Z: Vacuum circuit breaker
- N: Indoor application
- 63: Design sequence number
- 12: Rated voltage in kV
- /: Separator for configurable parameters
- First â¡: Rated current (A)
- Second â¡: Rated short-circuit breaking current (kA)
Construction
The circuit breaker employs a modular structure where the vacuum arc extinguishing chamber is housed within an enhanced insulating cylinder manufactured via the APG (Automatic Pressure Gelation) process. This design incorporates reinforced ribs and skirt edges to improve dielectric strength and mechanical stability while shielding the vacuum interrupter from contamination. The operating mechanism is a spring-charged type supporting both electric and manual operation, with precise linkage transmission and advanced damping to minimize contact bounce and rebound.
Primary terminals are labeled P1 (line side) and P2 (load side). Secondary control terminals include S1/S2 for shunt trip coils, H1/H2 for closing coils, and auxiliary contacts (e.g., 52a/52b) for status indication. All secondary wiring must comply with IEC 60670 standards.
Technical Parameters
Service Conditions
- Temperature: -10 degC to +40 degC (storage and transport permitted down to -30 degC)
- Altitude: <=1000 meters above sea level
- Humidity: Daily average relative humidity <=95%; monthly average <=90%
- Seismic Intensity: Not exceeding degree 8 on the Richter scale
- Hazards: Installation site must be free from fire, explosion risk, severe dust, chemical corrosion, and intense vibration
- Special Requirements: Custom environmental adaptations available upon request from technical support
Technical Data
| Item | Unit | 20kA | 25kA | 31.5kA | 40kA | 50kA |
|---|---|---|---|---|---|---|
| Rated Voltage | kV | 12 | 12 | 12 | 12 | 12 |
| Rated Current | A | 630 | 1250 | 1250 1600 2000 2500 |
1250 1600 2500 3150 |
1250 2500 3150 |
| Rated Short-Circuit Breaking Current | kA | 20 | 25 | 31.5 | 40 | 50 |
| Rated Short-Circuit Closing Current (Peak) | kA | 50 | 63 | 80 | 100 | 125 |
| 4s Rated Short-Time Withstand Current | kA | 20 | 25 | 31.5 | 40 | 50 |
| Power Frequency Withstand Voltage (After Breaking) |
kV | 42 (Break 48) | 42 (Break 48) | 42 (Break 48) | 42 (Break 48) | 42 (Break 48) |
| Impulse Withstand Voltage (After Breaking) |
kV | 75 (Break 85) | 75 (Break 85) | 75 (Break 85) | 75 (Break 85) | 75 (Break 85) |
| Mechanical Life | Times | 10000 | 10000 | 10000 | 10000 | 10000 |
| Operating Mechanism Rated Voltage | V | AC/DC 110, 220 | AC/DC 110, 220 | AC/DC 110, 220 | AC/DC 110, 220 | AC/DC 110, 220 |
| Contact Opening Distance | mm | 11 +/- 1 | 11 +/- 1 | 11 +/- 1 | 11 +/- 1 | 11 +/- 1 |
Installation & Wiring
Installation Diagram
The ZN63(VS1)-12kV breaker is available in both handcart and fixed mounting types, compatible with standard switchgear cubicles. Ensure adequate clearance for operation and maintenance. Contact meshing depth must be >=15 mm, and handcart stroke is 200 +/- 2 mm.
Outline Dimensions
| Dimension | Value (mm) |
|---|---|
| Handcart Stroke | 200 +/- 2 |
| Minimum Contact Meshing Size | >=15 |
| Rated Current (A) | 630 | 1250 | 1600 |
|---|---|---|---|
| Rated Short-Circuit Breaking Current (kA) | 20, 25 | 25, 31.5, 40 | 31.5 |
| Size of Matched Static Contact (mm) | phi35 | phi49 | phi55 |
Selection & FAQs
Selection Guide
- Confirm a 12kV, 50Hz indoor system and select rated current from 630A to 3150A above the maximum continuous and expected overload duty.
- Calculate the prospective short-circuit level and choose 20kA, 25kA, 31.5kA, 40kA or 50kA breaking capacity with matching making and 4-second withstand ratings.
- Select fixed mounting or withdrawable handcart construction and verify cabinet type, phase spacing, static-contact size, 200±2mm stroke and at least 15mm contact engagement.
- Specify AC or DC 110V/220V mechanism supply and coordinate trip/close coils, auxiliary contacts, protection relays, interlocks and remote-control logic.
- Check −10°C to +40°C service temperature, altitude, humidity, seismic duty, insulation clearances, grounding and access before approving the switchgear design.
Frequently Asked Questions
Q1: What short-circuit breaking currents are available for this 12kV vacuum circuit breaker?
Available ratings include 20kA, 25kA, 31.5kA, 40kA, and 50kA. Select the rating based on your system’s maximum fault level. Confirm exact parameters with our engineering team.
Q2: Can this indoor circuit breaker operate in high-altitude or extreme temperature environments?
Standard models operate up to 1000m altitude and -10°C to +40°C. For higher altitudes or extreme temperatures, custom environmental adaptations are available upon request. Contact technical support for details.
Q3: Which rated currents are supported for the 31.5kA short-circuit model?
The 31.5kA model supports rated currents of 1250A, 1600A, 2000A, and 2500A. Ensure your load requirements match these specific current ratings. Verify final selection before ordering.
Q4: How are these vacuum circuit breakers tested before factory shipment?
Routine factory tests are performed to verify mechanical and electrical parameters. Detailed test reports and specific certifications are subject to confirmation. Contact our sales team for details.
Q5: Can we request custom environmental adaptations for this 12kV switchgear component?
Yes, custom adaptations for severe dust, chemical corrosion, or extreme climates are available. These modifications are subject to technical evaluation. Submit your specific site conditions to our engineering team.
Q6: What is the primary application for the ZN63 VS1 indoor circuit breaker?
It is designed for 12kV indoor high-voltage switchgear to protect and control power systems. Ideal for industrial and urban grid distribution networks. Confirm specific application suitability with our engineers.
Q7: Are these VS1 vacuum breakers suitable for high-seismic installation sites?
Standard units withstand seismic intensity up to degree 8. For installations exceeding this threshold or in high-vibration areas, specialized mounting or designs are required. Consult technical support for site-specific solutions.