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.
Ideal for data centers, factories, and expansive buildings, this circuit breaker is celebrated for providing exceptional security, refined digital management, and efficient low energy consumption. It adheres strictly to IEC/GB standards, ensuring top-notch performance.
Working principle:
The air circuit breaker constantly monitors the circuit current using an advanced current transformer, transmitting signals to the intelligent controller.
Once the intelligent controller identifies any abnormal current, it promptly disconnects the internal contacts of the circuit breaker to cease the circuit flow,

Current |
630A-6300A |
Number of pole |
3P 4P |
Breaking Capacity |
N1,N2,H1,H1B,H2,H3,L1 |
Type |
Fixed Drawer |
Model |
MT/NW/MVS |
Product Features:
Δ Encased in a robust, high-temperature resistant, and flame-retardant shell, this product ensures unparalleled safety under extreme conditions. Experience peace of mind with top-notch protection designed for longevity and reliability.
Δ Featuring advanced copper-plated silver alloy contacts, both dynamic and static, this product guarantees superior performance and enhanced durability, offering you exceptional electrical conductivity and efficient operation every time.
Δ Equipped with premium silver alloy contacts, renowned for their high conductivity and superior arc resistance, this product promises exceptional performance, ensuring your operations are both safe and efficient with reduced wear and tear.
Δ Crafted with thick copper-plated silver busbars, standardized for both input and output terminals, this product offers robust connections and enhanced current flow, providing a reliable solution for your electrical system needs.
Δ With proven PCB reliability, backed by a rigorous 48-hour aging test, this product stands as a testament to quality and endurance, ensuring consistent and dependable performance in every application.
Installation Instructions
·The MTN and MTH series, ranging from a robust 800A to a powerful 6300A (excluding 4000A), feature the same seamless connection terminals,;
No additional space is needed for the front connection. The thoughtfully engineered terminals maintain the original depth, keeping the circuit breaker compact;
·For versatile connections on either horizontal or vertical busbars, effortlessly adjust the connection terminal by rotating it 90 degrees.
Rigorous Mechanical Operation Test:
Ensure the circuit breaker excels in mechanical operation, confirming it is both flexible and reliable.
Test a spectrum of operational functions including closing, opening, and energy storage.
Meticulous Electrical Performance Testing:
Insulation Resistance Test: Employ a megohmmeter to gauge the insulation resistance within both main and auxiliary circuits, ensuring compliance with the standard benchmark (typically ≥ 1M Ω).
Power Frequency Withstand Voltage Test: Apply the rated power frequency voltage, for instance, 2500V for 1 minute, to both the main and auxiliary circuits to evaluate the insulation integrity.
Contact Resistance Test: Precisely measure the contact resistance of the main contact, ensuring it remains below the prescribed threshold (generally at the micro ohm level).
Robust Protection Function Test:
Assess the accuracy and timing of protection functions, including overload, short circuit, and ground fault.
Verify the settings andfunctionality of the intelligent release device, assuring top-tier performance.
Outer packaging:
For the utmost in protection, robust and durable wooden boxes are typically employed to ensure exceptional mechanical strength.
Crafted wooden crates are ideal for accommodating large circuit breakers or facilitating seamless international transportation.
Inner packaging:
The circuit breaker is cocooned with supplementary buffer materials like foam pad, bubble film or pearl cotton to effectively mitigate any vibration and potential collision.
When handling oversized circuit breakers, the packaging box is ingeniously designed with layers, allowing accessories (such as manuals, tools, spare parts) to be neatly organized on the top layer
Domestic transportation
For transport within China, if a specific freight forwarder is assigned, we ensure timely delivery of products to the specified location via road transportation or domestic express service upon completion of production.
International transport
In scenarios where the shipment is small and time is of the essence, requiring delivery abroad to a designated location abroad, we partner with renowned international express delivery giants such as
DHL, FEDEX, UPS
Sea freight/air freight
For voluminous shipments where time is a flexible factor, we opt for sea freight. We meticulously select a reputable freight company, who will coordinate the logistics, arranging trucks to collect the cargo and transport it to the designated port for warehousing. Finally, the goods are shipped by sea to the customer's specified port, requiring them to retrieve the shipment with a bill of lading.
Mingtuo Electric Zhejiang Mingtuo Electric Technology Co., Ltd. is not just a pivotal player in the domestic market landscape but is also dynamically carving its presence across international borders. Our exceptional products find extensive applications in diverse sectors, including construction, industry, and energy. With a robust reputation, our solutions are the trusted choice for numerous prestigious engineering projects globally.
The company adheres to the principle ofcustomer first, quality first, service first, reputation first,and relentlessly pursues the philosophy of innovation and development. The company boasts strong technical prowess, cutting-edge production technologies, and a treasure trove of mature experience in research and development. Revered for our professionalism and technological leadership, we proudly house a comprehensive array of the most advanced production, testing, and inspection equipment available in China.
FAQ
Q: What is the product voltage/current range? What's the breaking ability?
A: For detailed specifications regarding voltage, current range, and breaking capacity, please reach out to our dedicated customer service team.
Q: What is the MOQ? Do you support sample ordering?
A: The minimum order quantity is 1 set, and yes, we indeed support sample ordering to give our clients a firsthand experience of our superior products.
Q: How long is the warranty period? How to apply for warranty?
A: Our products come with a warranty period ranging from one to two years. To initiate a warranty claim, simply connect with our responsive customer service team.
Q: Do you have CE, RoHS, UL and other certifications? Can you provide a certificate?
A: Yes, we hold CE and RoHS certifications and are pleased to provide any necessary certificates upon request.
Q: Does the price include tax/shipping?
A: Please note that the quoted prices are exclusive of shipping and tax charges.
Q: What famous clients or project cases have you worked with?
A: We take pride in our collaborations with esteemed clients such as the State Grid of China, Chint Group, and Xiaomi Group.