ZN85-40.5 Series 40.5kV Indoor Vacuum Circuit Breaker

Product Overview
The ZN85-40.5 Indoor High Voltage Vacuum Circuit Breaker is designed for indoor high-voltage systems with a rated voltage of 40.5kV and three-phase AC 50Hz. Ideal for industrial plants, power stations, and substations, it reliably interrupts load, overload, and short-circuit currents. Its robust design also supports frequent operations, making it a preferred choice for demanding environments.

Key Features and Benefits

• Superior Conductivity: Equipped with clover-shaped high-purity copper contacts, the breaker ensures excellent conductivity, strong corrosion resistance, and long-term performance stability, safeguarding electrical safety.

• Exceptional Environmental Adaptability: Designed to withstand wide temperature fluctuations and harsh conditions, it operates reliably even in challenging industrial or outdoor-adjacent environments.

• Advanced Vacuum Interruption Technology: Utilizes vacuum arc chambers (Cutler-Hammer or ZMD) with longitudinal magnetic field design for fast arc extinguishing, low chopping current, and superior asymmetrical breaking performance.

• Durable Operating Mechanism: High-quality spring and screw-operated mechanisms provide smooth, effortless operation with a maintenance-free mechanical life of over 10,000 operations. Ideal for frequent switching.

• Compact and Lightweight Structure: Air-organic composite insulation ensures a compact, lightweight design, simplifying installation and maintenance.

Models Available

• ZN85-40.5/1250-25

• ZN85-40.5/1250-31.5

• ZN85-40.5/1600-25

• ZN85-40.5/1600-31.5

• ZN85-40.5/2000-25

• ZN85-40.5/2000-31.5

Technical Specifications

Electrical Ratings

• Rated Voltage: 40.5 kV

• Rated Current: 1250A, 1600A, 2000A

• Rated Frequency: 50 Hz

• Peak Withstand Current: 63 kA – 80 kA

Normal Operating Conditions

• Ambient Temperature: -15°C to +40°C (daily average ≤35°C)

• Altitude: ≤1000 m

• Relative Humidity: 24h ≤95%, monthly ≤90%

Insulation and Interruption

• Rated Insulation Level: 1min power frequency withstand voltage (phase-to-phase, phase-to-ground, vacuum break) 95 kV; lightning impulse withstand voltage 185 kV

• Rated Short-Circuit Breaking Current: 25 kA, 31.5 kA

• Rated Short-Time Withstand Current: 25 kA, 31.5 kA

• Rated Short-Circuit Making Current: 63 kA, 80 kA

• Rated Peak Withstand Current: 63 kA, 80 kA

Mechanical Characteristics

• Mechanical Life: ≥10,000 operations

• Contact Wear Allowance (moving & fixed): 3 mm

• Contact Opening Distance: 20 ±2 mm

• Overtravel: 7.5 ±1.5 mm

• Three-Phase Operation Difference: ≤2 ms

• Main Circuit Resistance (per phase, including contact arms): ≤50 μΩ

Environmental Requirements

• Maximum Altitude: 2000 m

• Ambient Temperature Range: -15°C to +40°C

• Relative Humidity: Daily ≤90%, Monthly ≤90%

• Seismic Resistance: ≤8 degrees

• Other: No fire, explosion hazards, severe vibration, or chemical corrosion

For conditions beyond these limits, please consult with the manufacturer.

This ZN85-40.5 Indoor High Voltage Vacuum Circuit Breaker delivers high performance, long-term reliability, and safety for demanding industrial and utility applications. Its advanced vacuum interruption technology and robust mechanical design make it ideal for substations, power plants, and industrial facilities requiring frequent switching and dependable protection.

Customization & Support

Wei Shoe Elec provides ZN85-40.5 Series for specific power system needs, including non-standard current ratings, auxiliary accessories, and interlocking configurations.
For inquiries or technical assistance, please contact:

Engineer Thor
📞 Tel: +86-0577-62788197
📱 WhatsApp: +86 159 5777 0984
📧 Email: [email protected]