Key Features of ZN85-40.5 Vacuum Circuit Breaker\n\n\n\n

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• Advanced Arc-Extinguishing Design: The arc extinguishing chambers are independently housed in epoxy resin insulated cylinders, ensuring excellent electrical insulation, minimized creepage, and reduced product volume. Each phase is individually insulated, which enhances safety and overall reliability.\n\n\n\n
• Compact and User-Friendly Layout: The vacuum interrupters, drive mechanisms, and primary conductor systems are vertically arranged in an upper-lower configuration, which reduces the device\u2019s depth and makes it suitable for modern compact switchgear cabinets.\n\n\n\n
• Maintenance-Free Solid-Sealed Pole: The insulating cylinder integrates vacuum interrupters and current path components into one solid-sealed structure. This design allows for long-term operation without the need for routine maintenance.\n\n\n\n
• Flexible Installation: The breaker is available in both fixed and withdrawable configurations, suitable for XGN-40.5, KYN61 switchgear, and compact box-type substations.\n\n\n\n
• Compliant with Standards: Fully compliant withIEC 62271-100, ensuring reliable performance in medium voltage switching applications globally.\n\n\n\n\n

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  Environmental and Operating Conditions\n\n\n\n

  TheZN85-40.5 Vacuum Circuit Breaker is designed to operate reliably in diverse environments:\n\n\n\n

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  • Ambient Temperature: -10\u00b0C to +40\u00b0C\n\n\n\n
  • Altitude: \u22641500 meters\n\n\n\n
  • Relative Humidity: \u226495% (daily), \u226490% (monthly)\n\n\n\n
  • Earthquake Resistance: Up to 8 degrees\n\n\n\n
  • Free from flammable gases, severe pollution, chemical corrosion, and vibrations\n\n\n\n\n

    Applications\n\n\n\n

    Thisvacuum circuit breaker is ideal for:\n\n\n\n

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    • Power plants and substations\n\n\n\n
    • Industrial and mining operations\n\n\n\n
    • Medium voltage switchgear (fixed or drawout type)\n\n\n\n
    • Systems requiring frequent switching and high short-circuit breaking capacity\n\n\n\n\n

      Technical Parameters of ZN85-40.5 Vacuum Circuit Breaker\n\n\n\n

      Electrical Parameters\n\n\n\n

      Item	Unit	Value
      Rated Voltage	kV	40.5
      Rated Frequency	Hz	50
      Rated Current	A	630, 1250, 1600, 2000, 2500
      Short-Circuit Breaking Current	kA	25, 31.5
      Short-Time Withstand Current (RMS)	kA	25, 31.5
      Peak Withstand Current	kA	63, 80
      Short-Circuit Closing Current	kA	63, 80
      Capacitor Bank Breaking Current (Single\/Back-to-Back)	A	600 \/ 400
      Short-Circuit Current Duration	s	4
      Short-Circuit Breaking Times	Times	20
      Operating Sequence	\u2013	O-0.3s-CO-180s-CO
      Main Circuit Resistance	\u03bc\u03a9	\u226465
      Operating Voltage	V (AC\/DC)	220 \/ 110
      Mechanical Life	Times	\u226510,000\n\n\n\n \n\n\n\n Mechanical Parameters\n\n\n\n Item Unit Value Open Contact Gap mm 18 \u00b1 1 Overtravel mm 5 \u00b1 1 Contact Bounce Time ms \u22643 Phase Synchronism ms \u22642 Average Opening Speed m\/s 1.7 \u00b1 0.2 Average Closing Speed m\/s 0.75 \u00b1 0.2 Opening Time ms \u226490 Closing Time ms \u226460 Wear Limit (Contact) mm 3\n\n\n\n \n\n\n\n Mounting & Dimensions (Solid-Seal Type & Insulating Cylinder Type)\n\n\n\n Rated Current (A) Breaking Current (kA) Static Contact Size (mm) Plum-Blossom Contact Type 630 20\/25\/31.5 \u03a635 CT-30 1250 31.5 \u03a649 CT-30 1600 31.5 \u03a655 CT-36 2000 31.5 \u03a679 CT-48 2500 31.5 \u03a6109 CT-64\n\n\n\n Actuator and Operation Mechanism\n\n\n\n \n Uses the3AV3 spring operating mechanism known for its maturity and reliability.\n\n\n\n Simple design with output curves optimized for the 40.5kV vacuum interrupter\u2019s characteristics.\n\n\n\n Mechanism supports both manual and automatic energy storage, enabling local or remote operation.\n\n\n\n\n TheZN85-40.5 Vacuum Circuit Breaker is a cutting-edge, indoor high-voltage switching device designed for safe and efficient operation in demanding environments. Its compact structure, superior insulation, and mechanical reliability make it an ideal solution for 40.5kV medium voltage systems requiring high short-circuit performance and frequent operation. With a maintenance-free design and strong compliance with international standards, the ZN85-40.5 stands out as a trusted choice in modern power infrastructure.\n","protected":false},"excerpt":{"rendered":" The ZN85-40.5 Indoor Vacuum Circuit Breaker guide is a state-of-the-art medium voltage (MV) power protection device designed for three-phase AC 50Hz, 40.5kV power systems. As a key component in modern substations, power plants, and industrial environments, this vacuum circuit breaker delivers high-performance switching capability for load current, overload current, and fault current scenarios. Its compact […]\n","protected":false},"author":1,"featured_media":1284,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[36],"tags":[],"class_list":["post-1283","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vacuum-circuit-breaker"],"acf":[],"yoast_head":"\n