ZN85 405 Vacuum Breaker Seamless Integration with KYN61 Switchgear

The ZN85-40.5 Indoor High Voltage Vacuum Circuit Breaker is engineered as the ideal switching and protection device for modern 40.5kV air-insulated switchgear, particularly designed for seamless integration with KYN61-40.5 metal-enclosed switchgear. This compatibility makes it the preferred choice for utilities, industrial plants, and substations requiring reliable medium-voltage distribution in a standardized, space-efficient format.

The breaker features a drawer-type handcart structure that allows for easy insertion and withdrawal from the switchgear cabinet . The handcart utilizes a screw-nut propulsion mechanism with an overrunning clutch, ensuring smooth and precise movement along the cabinet's guide rails . When the handcart reaches either the "test" or "working" position, the clutch slips, producing an audible "click" and preventing over-travel, which guarantees accurate and repeatable positioning every time .

Safety is paramount in the ZN85-40.5's design, which incorporates comprehensive "five-prevention" interlocking features in coordination with the KYN61 cabinet . These interlocks ensure that: the breaker cannot be closed unless the handcart is fully in the test or working position; the handcart cannot be moved when the breaker is closed; and the grounding switch cannot be operated with the breaker in the working position . This mechanical interlocking system fundamentally prevents operator error and ensures personnel safety during maintenance.

The breaker is available in configurations compatible with KYN61 cabinet widths of 1200mm, 1400mm, and 1680mm, offering flexibility for various busbar and current transformer arrangements . Its fixed electrical connections within the main circuit ensure high reliability and eliminate the need for periodic adjustment . The insulating cylinders housing the vacuum interrupters are mounted directly on the breaker frame, maintaining precise alignment with the cabinet's primary disconnecting contacts.

Therefore, for projects utilizing KYN61-40.5 switchgear, the ZN85-40.5 offers a perfectly matched, fully integrated protection solution. Putai also supports customization and the supply of related medium-voltage accessories to meet system integration needs. For detailed information on integrating this breaker into your switchgear lineup, contact our technical team.

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