indoor high voltage vacuum circuit breaker ZN63A (VS1)-12 – Precision Engineering for Critical Power Systems

The Indoor High Voltage vacuum circuit breaker ZN63A (VS1)-12 is a field-proven, high-performance solution tailored for 12kV indoor power distribution networks. Combining decades of design refinement with modern manufacturing standards, this breaker delivers exceptional reliability, fast fault clearance, and seamless compatibility with standard switchgear—making it a top choice for industrial, commercial, and utility applications worldwide.

Key advantages of the ZN63A VS1-12 vacuum circuit breaker include:

• High breaking capacity up to 31.5kA with rated currents from 630A to 4000A

• Sealed-for-life vacuum interrupter technology ensuring maintenance-free operation over 10,000+ mechanical cycles

• Fully compliant with IEC 62271-100 and designed for integration into KYN28-type and other metal-clad switchgear

• Robust mechanical interlocks and clear visual indicators for enhanced operator safety

• Compact frame optimized for indoor high voltage switchgear installations with limited space

The unit’s rugged enclosure—shown in the image above—features a durable powder-coated finish resistant to humidity and dust, ideal for long-term indoor deployment. Its spring-charged operating mechanism ensures consistent performance even under frequent switching demands.

Whether used as a main feeder, motor controller, or transformer protection device, the ZN63A (VS1)-12 indoor high voltage vacuum circuit breaker offers unmatched value through reduced downtime, lower lifecycle costs, and future-ready adaptability. Optional smart modules enable remote monitoring and predictive diagnostics, supporting digital substation initiatives without compromising core reliability.