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LY-ACB Air Circuit Breaker

The LY-ACB series air circuit breaker is specifically engineered for 50Hz/60Hz AC distribution networks, delivering comprehensive circuit protection for power systems with rated voltages up to 400V/690V and current ratings extending to 6300A. Featuring integrated protection against overloads, short circuits, undervoltage, and single-phase ground faults, it ensures secure and stable grid operations. Compliant with IEC60947-2 and GB/T14048.2-2008 standards, this solution is ideal for power stations, industrial plants, mining operations (690V systems), and smart buildings. Available in both withdrawable and fixed versions with horizontal/vertical mounting options.

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LY-ACB Circuit Breaker High Breaking Capacity ACB 690V Mining Circuit Breaker Long-Life Air Circuit Breaker Smart Selective Protection ACB

Product Advantages

Technical Parameters

Product Feastures

Product Operate Guide

FAQ

Product Advantages

1. Intelligent Selective Protection

Smart Tripping Technology: The system intelligently detects fault zones, isolating only the affected sections, such as short-circuit currents of up to 120kA\@400V. This reduces the scope of power outages by 70%, significantly improving system reliability.
Operational Efficiency: Minimizes the disruption of power to unaffected areas, maintaining continuous operations and reducing system downtime.

2. Ultra-High Breaking Capacity

High Interrupting Power: Designed to handle maximum short-circuit breaking capacity of Icu=120kA (400V) and 80kA (690V). This ensures fast and effective fault current interruption, safeguarding critical machinery and reducing the risk of long-term damage.
Enhanced Safety: Offers robust protection for high-power systems and sensitive equipment, reducing the likelihood of catastrophic failures during short-circuit events.

3. Full-Scenario Adaptability

Dual Voltage Compatibility: Capable of operating at both 400V and 690V with a wide current range of 630A to 6300A, making it versatile for various industrial applications.
Robust Protection: The transformer is built for extreme conditions, including high-altitude mining environments and humid factories, ensuring consistent performance with IP40/IP65 protection to guard against dust and water ingress.

4. Extended Lifespan & Low Maintenance

Durability: Rated for 10,000 mechanical operations, featuring silver-plated contacts that minimize contact resistance (≤50μΩ). This reduces wear and tear, enhancing the product's overall lifespan.
Cost-Effective Maintenance: A 50% reduction in maintenance frequency allows for less downtime and lower operational costs, making this product a reliable and long-term investment.

5. Global Compliance

International Certifications: Certified under IEC60947-2 and GB/T14048.2 standards, guaranteeing that the product meets rigorous international safety and performance requirements.
Market Ready: The product is fully compliant with global regulations, making it suitable for export and use in a variety of industrial sectors across the world.

Parameter

Specification

Rated Current (Ie)

630A-6300A

Rated Voltage (Ue)

AC 400V/690V

Poles

3P/4P

Rated Insulation Voltage (Ui)

1000V

Breaking Capacity (Icu/Ics)

120kA@400V

80kA@690V

Mechanical Durability

10000 operations

Mounting Type

Withdrawable/Fixed

Connection Orientation

Horizontal/Vertical

Product Features

Energy Efficiency: Designed to operate at higher efficiency with minimal energy loss.
Environmentally Friendly: The dry-type design eliminates the need for oil, contributing to a cleaner environment.
Compact Design: Ideal for space-constrained environments without compromising on performance.
Long-lasting Durability: Engineered to withstand extreme weather and operational conditions.
Versatile Application: Suitable for industrial facilities, power substations, and commercial buildings.

Product Operate Guide

1. Installation Requirements

Mounting Orientation: For optimal heat dissipation and to ensure the longevity of the unit, vertical mounting is recommended. Maintain a minimum of 50mm side clearance to ensure proper airflow and avoid overheating.
Withdrawable Units: When installing withdrawable units, ensure the rails are perfectly aligned. The insertion force required for smooth operation should not exceed 100N, ensuring easy maintenance and access to components.

2. Termination Specifications

Torque Control: For reliable copper busbar connections, it’s critical to apply the proper torque values during installation. For example, 45N·m torque should be applied to 630A models to avoid any deformation of the connections, ensuring a secure and long-lasting connection.
Connection Inspection: Ensure all connections are clean, free of corrosion, and properly tightened to avoid connection issues that could affect the system's performance. Improperly torqued connections may lead to overheating or malfunction.

3. Functional Testing

Pre-Commissioning Test: Before the transformer is fully commissioned, conduct a short-circuit simulation to test the trip response time. Ensure the response time is within 32ms, which is critical to ensure the system responds quickly to faults and protects the equipment.
Verification of Trip Functionality: Check all protective mechanisms to verify that the transformer is able to isolate the affected sections efficiently, minimizing disruption and ensuring overall system reliability.

4. Safety Considerations During Installation

Grounding and Earthing: Ensure proper grounding and earthing systems are in place before energizing the transformer. This helps to avoid electrical shock hazards and enhances safety during operation.
Environmental Conditions: Installation should be performed in dry, dust-free environments. If the installation is in harsh environments (e.g., high humidity, dust, or extreme temperatures), additional sealing and protection methods should be used to ensure the unit’s long-term functionality.