AIR CIRCUIT BREAKER
MT/MVS
ACB (Air Circuit Breaker) is a high-performance low-voltage circuit breaker, with representative models including MT/NT and MVS series, covering rated currents of 630A~6300A, with a breaking capacity of up to 150kA, suitable for industrial, commercial, and energy distribution systems.
Core features:
Intelligence: Built-in Micrologic release, supports real-time monitoring (current, voltage, fault recording) and remote control, compatible with EcoStruxure platform.
High reliability: modular design, optional electronic/thermal magnetic protection, with a lifespan of tens of thousands of operations.
Comprehensive protection: Provides overload, short circuit, and ground fault protection, and supports selective coordination.
Flexible Expansion:Communication modules (Modbus, Ethernet) and auxiliary contacts can be installed.
Suitable for scenarios such as data centers, factories, and large buildings, known for high security, digital management, and low energy consumption, in compliance with IEC/GB standards.
Working principle:
The air circuit breaker diligently monitors the current in the circuit in real-time through a sophisticated current transformer. It then transmits the precise current signal to the intelligent controller.
Upon the intelligent controller's detection of any abnormal current, it promptly disconnects the contacts within the circuit breaker to cut off the circuit

Current |
630A-6300A |
Number of pole |
3P 4P |
Breaking Capacity |
N1,N2,H1,H1B,H2,H3,L1 |
Type |
Fixed Drawer |
Model |
MT/NW/MVS |
Exquisite Product Features:
Δ Experience Unmatched Durability with Our High-Temperature Resistant & Flame-Retardant Casing
Δ Embrace Efficiency with Premium Copper-Plated Silver Alloy Contacts (Dynamic/Static)
Δ Enjoy Optimal Performance with Silver Alloy Contacts Boasting High Conductivity & Superior Arc Resistance
Δ Built for Excellence: Thick Copper-Plated Silver Busbars, Your Standard In/Out Terminals Solution
Δ Trust Our PCB Reliability, Verified with a 48-Hour Aging Test
Installation Instructions
·The MTN and MTH series, ranging from 800A to an impressive 6300A, save for the 4000A variant, seamlessly share the same connection terminals for ultimate convenience.;
Ingeniously designed, there is no need for additional space in front, as the terminals ingeniously maintain the original depth of the circuit breaker, ensuring a compact fit;
·For versatility, whether you are connecting on a horizontal or vertical busbar, simply pivot the connection terminal by 90 degrees with ease.
Mechanical Operation Test:
Carefully check whether the mechanical operation of the circuit breaker exhibits flexibility and reliability.
Thoroughly test the operation functions including closing, ensuring seamless, opening, and energy storage capabilities.
Electrical Performance Testing:
Insulation Resistance Test: Utilize a megohmmeter to meticulously measure the insulation resistance of both the main and auxiliary circuits, guaranteeing they meet the standard benchmark (usually ≥ 1M Ω).
Power Frequency Withstand Voltage Test: Administer the rated power frequency voltage (such as 2500V/1min) to the main and auxiliary circuits to thoroughly assess the insulation performance.
Contact Resistance Test: Accurately measure the contact resistance of the main contacts, ensuring it remains below the specified threshold (typically in the micro ohm level).
Protection Function Test:
Evaluate the action values and timing of critical protection functions, such as overload, short circuit, and ground fault mitigation.
Confirm and verify the settings andfunctional efficacy of the sophisticated intelligent release device.
Outer packaging:
Robust and Resilient wooden boxes are frequently employed to ensure optimal mechanical protection.
Wooden crates are ideal for accommodating large circuit breakers or for secure international shipping.
Inner packaging:
The circuit breaker is enveloped with protective materials like foam pads, bubble film or pearl cotton to mitigate vibration and potential damage from collision.
For substantial circuit breakers, the packaging box may feature a multi-layered design, with essential accessories such as manuals, tools, and spare parts) positioned on the upper tier
Domestic transportation
In the event of having a designated freight forwarder within China, we efficiently deliver products to the appointed location via road transport or domestic express delivery promptly after production completion
International transport
For small shipments requiring expedited delivery to an internationally specified location, we opt for one of the renowned global express delivery options:
DHL, FEDEX, or UPS
Sea freight/air freight
For larger consignments where timing is flexible, sea freight is preferred. A reliable freight companywill arrange for transportation of goods by truck to the designated port for warehousing. Subsequently, items will be shipped by sea to the customer's designated port, where retrieval requires a bill of lading.
Mingtuo Electric Mingtuo Electric not only holds a prominent and influential position in the domestic market, but is also strategically and successfully expanding into the global arena. Our products are extensively utilized across a myriad of sectors such as construction, industry, and energy. They have garnered the trust and admiration of numerous high-profile engineering projects and are a testament to our quality and reliability.
The company adheres to the principle ofcustomer first, quality first, service first, reputation first,and passionately embraces the concept of continuous innovation and forward-thinking development. The company is armed with robust technical expertise, state-of-the-art production technology, and extensive experience, in research and development, earning us a distinguished reputation for professionalism and technological leadership. Our facilities boast a comprehensive array of cutting-edge production, testing, and inspection equipment, making us a frontrunner in the industry.
FAQ
Q: What is the product voltage/current range? What's the breaking ability?
A: For specific details, please reach out to our customer service team who are always ready to assist you.
Q: What is the MOQ? Do you support sample ordering?
A: The minimum order quantity is just 1 set, and we are pleased to offer support for sample ordering to facilitate your decision-making.
Q: How long is the warranty period? How to apply for warranty?
A: Our products come with a generous warranty period ranging from one to two years. Simply contact customer service to apply for warranty coverage.
Q: Do you have CE, RoHS, UL and other certifications? Can you provide a certificate?
A: Yes, we have obtained prestigious CE and RoHS certifications, and we are more than happy to provide these certificates upon request.
Q: Does the price include tax/shipping?
A: Please note that the listed price is exclusive of shipping and tax costs.
Q: What famous clients or project cases have you worked with?
A: We have proudly collaborated with renowned clients such as the State Grid of China, Chint Group, and Xiaomi Group, underscoring our commitment to excellence and innovation.