ZN85 12kV Outdoor Vacuum Circuit Breaker, 630A, Pole-Mounted

The MINGTUO ZN85 12kV Outdoor Vacuum Circuit Breaker (VCB) is a high-performance switching device designed for medium-voltage distribution networks. Rated at 630A with a breaking capacity of up to 25kA, this breaker is engineered for pole-mounted or ground-mounted applications, ensuring reliable protection in industrial, utility, and renewable energy systems. Its robust construction and advanced vacuum interruption technology enable safe, fast, and maintenance-free operation in harsh outdoor environments.

Design and Features:

Vacuum Interruption Technology: Hermetically sealed interrupters provide high dielectric strength, arc extinction, and consistent performance over extended service life.

Mechanical Operation: Spring-operated mechanism allows both manual and remote operation, enabling rapid contact separation during overloads or short circuits.

Environmental Protection: IP54-rated casing with corrosion-resistant materials ensures durability in extreme weather conditions, including high humidity, wind, and dust.

Compact and Modular Layout: Simplifies installation, inspection, and maintenance while integrating essential auxiliary equipment, such as current transformers and protective relays.

Environmental and Installation Conditions:

Ambient Temperature: -30°C to +40°C

Installation Elevation: Up to 2000 meters above sea level

Humidity: Relative humidity up to 50% at +40°C; up to 90% during wet months, accounting for condensation

Protection Class: IP54

Usage Category: Class A or B

Installation Guidelines: Must follow the manual; vertical tilt ≤5° (≤15° for mining applications)

Operation Principle:

Under normal conditions, main contacts remain closed to carry current uninterrupted. When a fault is detected, the spring mechanism rapidly opens the contacts, generating a vacuum arc that is efficiently extinguished within the sealed interrupter. This ensures fast interruption of fault currents, protects downstream equipment, and maintains system stability.

Applications:

Distribution Network Protection: Pole-mounted feeder lines, rural electrification, and automatic sectionalizing of distribution circuits.

Substations: Outgoing lines, transformer protection, and bus tie breakers.

Industrial Power Systems: Factory main incoming lines, large motor protection, and industrial load circuits.

Infrastructure Projects: Renewable energy connections, railway electrification, and mining power systems.

Special Scenarios: Frequent load switching, capacitor bank control, and safe interruption of cable charging currents.

Advantages:

High reliability with a mechanical endurance of 10,000 operations

Advanced vacuum interrupter technology for minimal maintenance

Compact and corrosion-resistant design suitable for outdoor environments

IP54 protection ensures operation in harsh conditions

Integrated smart monitoring and remote control capabilities

Compliance with GB/T 11022 and IEC 62271 standards

Customizable configurations for specific project requirements

Quality Assurance:

Each ZN85 breaker undergoes comprehensive testing, including power frequency withstand, contact resistance, and mechanical timing evaluations. Manufactured under strict quality control, these breakers offer maintenance-free operation for up to 20 years with a reliability rate exceeding 99.9%. OEM support and worldwide shipping are available, with continuous technical assistance provided.