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ZN63(VS1)-24 Series Indoor High-Voltage Vacuum Circuit Breaker
Product Overview
The ZN63(VS1)-24 indoor vacuum circuit breaker is designed for three-phase AC systems up to 24kV, 50Hz. It serves as a control and protection device for power distribution networks, substations, industrial plants, and electrical systems that demand high reliability under frequent switching or fault conditions.
Compared with the ZN63(VS1)-12 model, this upgraded 24kV version features enhanced insulation strength, improved dielectric distance, and optimized arc-extinguishing performance, making it suitable for high-voltage applications such as capacitor bank switching, furnace control, and transformer protection.
The breaker integrates its operating mechanism and vacuum interrupter into a compact unit, available in both fixed and withdrawable (truck-type) designs.
Model Designation
ZN63(VS1)-24 Vacuum Circuit Breaker Naming Rule:
Z N 63 - 24 / □ - □ │ │ │ │ │ │ │ │ │ └── Rated short-circuit breaking current (kA) │ │ │ └────── Rated current (A) │ │ └──────────── Rated voltage (kV) │ └─────────────── Design sequence number └──────────────── Indoor vacuum circuit breaker
Technical Parameters
| Item | Unit | Value |
|---|---|---|
| Rated voltage | kV | 24 |
| Maximum operating voltage | kV | 27 |
| Rated frequency | Hz | 50 |
| Rated current | A | 630 / 1250 / 1600 / 2000 / 2500 |
| Rated short-circuit breaking current | kA | 20 / 25 / 31.5 |
| Rated short-time withstand current (4s) | kA | 20 / 25 / 31.5 |
| Rated peak withstand current | kA | 50 / 63 / 80 |
| Power frequency withstand voltage (1 min) | kV | 65 |
| Lightning impulse withstand voltage (peak) | kV | 125 |
| Rated operating sequence | — | O–0.3s–CO–180s–CO |
| Mechanical life | operations | 20,000 |
| Rated short-circuit breaking times | operations | 50 |
| Operating mechanism rated control voltage | V | AC/DC 110, 220 |
| Contact gap | mm | 11 ± 1 |
| Contact overtravel (spring compression) | mm | 4 ± 0.5 |
| Average opening speed | m/s | 0.4–0.8 |
| Average closing speed | m/s | 0.9–1.2 |
| Opening time (max. voltage) | s | ≤0.05 |
| Closing time (min. voltage) | s | ≤0.1 |
| Main circuit resistance per phase | μΩ | ≤40 |
| Allowable cumulative contact wear | mm | 3 |
Key Features
Enhanced Insulation System – redesigned vacuum interrupter and insulating cylinder to meet 24kV dielectric requirements.
High Mechanical Strength – ensures 20,000 mechanical operations under normal conditions.
Reliable Arc Interruption – advanced contact design minimizes contact erosion and ensures stable breaking under high fault currents.
Flexible Installation – compatible with both fixed-mounted and KYN28A-24 withdrawable switchgear systems.
Low Maintenance – modular structure allows easy inspection and replacement of key components.
Applications
The ZN63(VS1)-24 vacuum circuit breaker is suitable for various medium- and high-voltage systems requiring frequent operation or protection against overload and short-circuit conditions.
It is widely used in:
Power distribution substations (24kV class)
Industrial facilities with heavy-duty loads
Capacitor banks and electric furnace control systems
Energy storage stations and renewable power grids
Urban infrastructure and public utilities
Comparison with ZN63(VS1)-12
| Aspect | ZN63(VS1)-12 | ZN63(VS1)-24 |
|---|---|---|
| Rated Voltage | 12kV | 24kV |
| Insulation Cylinder | Standard design | Enhanced creepage distance & thicker insulation |
| Mechanical Life | 30,000 operations | 20,000 operations |
| Application Voltage Range | ≤12kV systems | ≤24kV systems |
| Compatible Switchgear | KYN28A-12 | KYN28A-24 |
Customization & Support
Wei Shoe Elec provides custom-built ZN63(VS1)-24 circuit breakers tailored to your specific system requirements — including non-standard current ratings, auxiliary accessories, interlocking options, and busbar configurations.
All products are tested according to IEC 62271-100 and GB1984-2014 standards.
For engineering consultation or technical quotations, please contact:
Engineer Thor
📞 Tel: +86-0577-62788197
📱 WhatsApp: +86 159 5777 0984
📧 Email: [email protected]
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