ACB/Air Circuit Breaker
MT/MVS Series
 |
 |
 |
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：
|
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. |
 |
 |
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. |
|
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: |
 |
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
|
Pre-wired Terminal Block
|
Motor
|
MN UVR Coil MX SHT Coil
|
Control Unit Micrologic
|
Sensor Plug
|
Auxiliary Contact
|
|
Machinism
|
Copper Bar
|
Mechanical Interlocking
|
Production line:
 |
 |
 |
 |
 |
 |
Process
 |
 |
 |
 |
Quick Detail:
|
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 |
 |
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：
|
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:
 |
 |
 |
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
Packaging
 |
 |
 |
Outer packaging:
Strong wooden boxes are usually used to provide sufficient mechanical strength.
Wooden crate suitable for large circuit breakers or international transportation
Inner packaging:
Wrap the circuit breaker with buffer materials such as foam pad, bubble film or pearl cotton to prevent vibration and collision.
For large circuit breakers, the packaging box may adopt a layered design, with accessories (such as manuals, tools, spare parts) placed on the upper layer
 |
 |
 |
Upgraded Packaging
Shipping
 |
 |
 |
 |
 |
Domestic transportation
If there is a designated freight forwarder in china, we willtransport the products to the designated location through road transportation or domestic express delivery after production is completed
International transport
When the quantity of goods is small and time is tight, and it needs to be transported to a designated location abroad, the three majorinternational express delivery companies are selected for transportation
DHL,FEDEX,UPS
Sea freight/air freight
When there is a large quantity of goods and time is not urgent, we choose sea freight. We will choose a suitable freight company, who wil arrange for trucks to pick up the goods and transport them to the designated por for warehousing. Finaly, they will transpored by sea to the customer's desianated port, and the customer needs to pick up the goods with a bill of lading.
Real photo
 |
 |
 |
 |
 |
 |
 |
 |
Feedback
Customer installation return drawing
 |
 |
 |
 |
Real feedback
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
Certificate
 |
 |
 |
Air Circuit Breakers (ACBs) are deployed as the first line of defense in main power distribution and protection. Their primary applications span across industrial plants, large commercial complexes, data centers, and public infrastructure like airports and hospitals, where they ensure system integrity, protect costly equipment from electrical faults, and guarantee operational safety and continuity in mission-critical environments.
Q: What is the voltage/current range of this product? What is its breaking capacity?
A: Please contact customer service for details.
Q: What is the minimum order quantity? Do you accept sample orders?
A: The minimum order quantity is 1 set, and we accept sample orders.
Q: What is the warranty period? How do I apply for a warranty?
A: The product warranty is 1 to 2 years. Please contact customer service directly to apply.
Q: Do you have CE, RoHS, UL, or other certifications? Can you provide certificates?
A: We have CE and RoHS certifications and can provide certificates.
Q: Does the price include tax/shipping?
A: The price does not include shipping/tax.
Q: What notable clients or project examples have you worked with?
A: State Grid Corporation of China, Chint Group.
Copyright © Zhejiang Mingtuo Electric Technology Co., Ltd.
EN
