ZN63 VS1 3-Phase Indoor vacuum circuit breaker – Trusted Performance for Medium-Voltage Applications

The ZN63 VS1 3-phase indoor vacuum circuit breaker is a robust, high-efficiency switching solution engineered for reliable operation in 12kV power distribution systems. Widely used across industrial plants, commercial buildings, and utility substations, this breaker delivers exceptional interrupting capability, long service life, and seamless compatibility with standard metal-clad switchgear—making it a cornerstone of modern indoor medium-voltage protection.

Built on mature vacuum interrupter technology and a spring-operated mechanism, the ZN63 VS1 3-phase indoor vacuum circuit breaker ensures stable performance under continuous load and rapid fault clearance during short-circuit events. With rated currents from 630A to 4000A and breaking capacities up to 31.5kA, it meets IEC 62271-100 standards for safety, durability, and interoperability.

Its modular, compact design supports both fixed and withdrawable installation in 12kV switchgear, enabling easy maintenance and safe isolation without disrupting adjacent equipment. The unit features mechanical interlocks, clear open/close indicators, and optional auxiliary contacts or smart monitoring modules for integration into automated control systems.

The professional-grade enclosure—visible in the image above—boasts a corrosion-resistant finish and ergonomic layout, ideal for demanding indoor environments. Whether deployed in KYN28-type cabinets or custom switchgear assemblies, the ZN63 VS1 offers low operational noise, minimal maintenance, and excellent thermal stability.

As a globally recognized workhorse in medium-voltage infrastructure, the ZN63 VS1 indoor vacuum circuit breaker combines proven reliability with cost-effective lifecycle management—ensuring uninterrupted power delivery for mission-critical applications worldwide.