ACB/Air Circuit Breaker
MT/MVS Series
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General product information:
Place of Origin: |
5th Floor, No. 3, Jinghong West Road, Liushi Town, Yueqing City, Wenzhou City, Zhejiang Province |
Price: |
1000$ |
Brand Name: |
MINGTUO |
Packaging Details: |
Wooden box packaging |
Model Number: |
ACB NT-630 |
Delivery Time: |
Within fifteen days |
| Certification: | IOS CE ROHS | Payment Terms: |
100% prepaid, 70%/30%, 80%/20% |
Minimum Order Quantity: |
1 |
Supply Ability: |
Available at any time |
Description：
Air circuit breakers (ACBs) represent a high-efficiency category of low-voltage protection devices. Typical series such as MT/NT and MVS offer rated currents spanning 630A to 6300A and a breaking capacity of up to 150kA. They are widely applied across industrial, commercial, and power distribution systems for reliable circuit protection.
Key Features:
Smart Features
Equipped with a built-in Micrologic trip unit, it enables real-time monitoring of current, voltage, and fault records, supports remote control, and is compatible with the EcoStruxure platform.
High Reliability & Long Life
Built with a modular design, it offers optional electronic or thermal-magnetic protection and a mechanical lifespan of up to tens of thousands of operations.
Complete Protection & Selectivity
Delivers comprehensive protection against overload, short-circuit, and ground fault, while supporting selective coordination to enhance system uptime.
Flexible Configuration Options
Allows for easy expansion through add-on communication modules (such as Modbus and Ethernet) and auxiliary contacts.
Ideal Applications & Compliance
Suited for data centers, factories, and large buildings, offering high safety, digital management, and energy efficiency in compliance with IEC and GB standards.
Working principle：
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An air circuit breaker (ACB) automatically interrupts electrical current upon detecting an overload or short-circuit fault. Under normal conditions, its primary contacts stay closed to maintain uninterrupted current flow. In cases of prolonged overcurrent, heat causes the thermal element to deform, which activates the tripping mechanism. For sudden short circuits, a solenoid coil produces an instant magnetic pulse that triggers the same tripping action, rapidly forcing the main contacts apart. Once the contacts separate, a powerful electric arc forms between them and is quickly driven into the arc-extinguishing chamber. There, the arc is split, cooled, and suppressed, thereby safely isolating the circuit and protecting the system from damage. |
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Copper bar: The facility acquires used units, dismantles them, and extracts the copper busbars and side plates for re-plating. Alternatively, the copper busbars may be fully replaced. The re-plated busbars deliver excellent electrical conductivity while providing improved resistance to oxidation and corrosion. |
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Controller: A range of controllers is available for selection, including models 2.0, 2.0A, 2.0E, 5.0A, and 5.0E. Each unit undergoes inspection and testing. If any controller is found to be faulty, it will be replaced and retested to guarantee proper operation and full protective functionality.
The selection guidelines are as follows: |
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Motor/Coil:
Upon inspection, if the motor or coil is determined to be faulty, it will be replaced by the factory.
Following replacement, the entire ACB undergoes comprehensive testing to confirm correct motor function and to validate proper opening and closing operations.
This process ensures complete operational reliability of both the motor and coil.
Motor selection is based on current rating:
- For currents below 2000A, use small motor (NT/N1 series)
- For currents above 2000A, use big motor (NW/H1 series)
✳Tips:We can also sell internal accessories separately
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Pre-wired Terminal Block
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Motor
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MN UVR Coil MX SHT Coil
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Control Unit Micrologic
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Sensor Plug
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Auxiliary Contact
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Machinism
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Copper Bar
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Mechanical Interlocking
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Production line:
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Process
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Quick Detail:
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Air Circuit Breaker ACB LV ACB (Low Voltage Air Circuit Breaker) Fixed Air Circuit Breaker Fixed ACB 2000A Circuit Breaker 1600A ACB 2000A Frame ACB 6300A ACB Medium-Frame ACB Circuit Protector Power Circuit Breaker Main Circuit Breaker Industrial Circuit Breaker Fixed Mount Circuit Breaker Drawer-type air circuit breaker |
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The Air Circuit Breaker (ACB) functions as a principal component for safeguarding and managing electrical power distribution. It acts as an essential protective device within low-voltage installations, effectively disconnecting fault currents to shield connected equipment from the effects of overloads and short circuits. Engineered for durability, it maintains system reliability and enhances safety for both personnel and infrastructure across industrial facilities, commercial complexes, and major construction projects.
Testing
Test Process：
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Mechanical Operation Test Electrical Performance Test - Conduct a power-frequency withstand voltage test by applying the rated AC voltage (e.g., 2500V for 1 minute) to evaluate insulation integrity. - Perform a contact resistance test on the main contacts to verify values remain below the specified limit (typically in the micro-ohm range). Protection Function Test |
Controller testing and product testing:
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1. Power-On Operational Test
Manually open and close the circuit breaker 3 to 5 times to verify smooth and reliable operation of the mechanism, ensuring there is no sticking or unusual noise. Conduct wiring verification tests to confirm the proper function of remote opening and closing operations.
2. Protection Function Verification
Test the following protection features:
- Overload protection (Long-time delay, L)
- Short-circuit protection (Instantaneous/Short-time delay, I)
- Earth fault protection (G)
3. Visual & Electrical Inspection
- Enclosure & Connections: Inspect the controller housing for damage and ensure all wiring terminals are tight and secure.
- Display & Indicators: Verify normal operation of the display screen (if equipped) and check the status of the power indicator.
- Power Supply Check: Measure the control power supply voltage to confirm it is within the specified range (typically 24V DC or 110/220V AC).
Renovation process：
1.Used Product Selection:
We select products with intact barcodes, recent manufacturing dates, fully functional opening/closing and energy storage mechanisms, and relatively intact appearance without damage.
2.Refurbishment Process：
First, completely disassemble the used products. Then, clean the insulation components, followed by electroplating the copper and iron parts. Next, thoroughly air-dry all components. After that, spray-paint and lubricate the insulation parts. Finally, proceed with reassembly, debugging, and packaging before shipping.
Specifications
Real photo
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Certificate
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Copyright © Zhejiang Mingtuo Electric Technology Co., Ltd.
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