Indoor Three-Pole Mechanical Switchgear ZN85 – Technical Description The ZN85 is a robust, indoor three-pole mechanical switchgear designed for medium-voltage applications, typically rated for 12–40.5 kV. It is widely used in power distribution systems for switching, protection, and isolation of electrical circuits. The switchgear combines mechanical reliability with a compact design, making it suitable for confined indoor installations such as substations, industrial plants, and commercial facilities. Key Features 1. Three-Pole Construction The ZN85 features three independent poles housed in a single unit, ensuring synchronized operation for balanced three-phase systems. Each pole is equipped with a vacuum interrupter, providing high dielectric strength and long service life. 2. Vacuum Interruption Technology Utilizing vacuum interrupters, the ZN85 ensures efficient arc quenching, minimizing contact erosion and maintenance requirements. This technology enhances safety by preventing gas emissions and fire hazards associated with oil or SF6-based systems. 3. Mechanical Operation Mechanism The switchgear employs a spring-operated mechanism for quick and reliable switching. The mechanical interlocks prevent unsafe operations, ensuring compliance with industry safety standards. Manual and motorized operation options are available for flexibility. 4. Compact and Modular Design Designed for space efficiency, the ZN85’s compact structure allows easy integration into existing switchgear panels. Its modular design facilitates maintenance and future upgrades without extensive downtime. 5. Protection and Safety Features - Interlocks prevent closing on fault conditions. - Earthing switches provide additional safety during maintenance. - Insulated barriers reduce the risk of accidental contact with live parts. 6. Environmental Adaptability The ZN85 operates effectively in a wide temperature range (-15°C to +40°C) and high-humidity environments, making it suitable for diverse climatic conditions. Applications - Power distribution networks (secondary substations, ring main units). - Industrial plants (motor control, transformer protection). - Renewable energy systems (solar/wind farm integration). Advantages - High breaking capacity for reliable fault interruption. - Low maintenance due to vacuum technology. - Enhanced safety with mechanical interlocks and earthing options. Conclusion The ZN85 indoor three-pole mechanical switchgear is a durable, efficient, and safe solution for medium-voltage power distribution. Its vacuum interruption technology, robust mechanical operation, and compact design make it a preferred choice for modern electrical infrastructure.