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 an impressive 150kA, suitable for a wide range of industrial, commercial, and energy distribution systems.
Core features:
Intelligence: Built in with advanced Micrologic release, it supports real-time monitoring (current, voltage, fault recording) and offers remote control capabilities, seamlessly integrating with the EcoStruxure platform.
High reliability: Featuring a modular design, it offers optional electronic/thermal magnetic protection, boasting a lifespan of tens of thousands of operations.
Comprehensive protection: Provides robust overload, short circuit, and ground fault protection, and supports selective coordination for enhanced safety.
Flexible Expansion:Communication modules (Modbus, Ethernet) and auxiliary contacts can be easily installed.
Perfectly suitable for scenarios such as data centers, factories, and large buildings, it is renowned for high security, digital management, and low energy consumption, strictly adhering to IEC/GB standards.
Working principle:
The air circuit breaker continuously monitors current through a current transformer, transmitting the signal to the intelligent controller.
Upon detecting an abnormal current, the intelligent controller will swiftly disconnect the contacts within the circuit breaker to cut off the circuit, ensuring safety and protection

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: Discover the exceptional attributes of the ACb Switch Circuit Breaker - 27x32x40cm Heavy Duty Protection Device, meticulously engineered to offer unparalleled safety and efficiency. Each feature is a testament to our commitment to delivering robust and reliable electrical solutions.
Δ High-Temperature Resistant & Flame-Retardant Casing: Engineered to withstand extreme conditions, the casing offers superior protection against high temperatures and flames, ensuring long-lasting durability and excellence in safeguarding your electrical systems.
Δ Copper-Plated Silver Alloy Contacts (Dynamic/Static): Experience enhanced performance with our advanced copper-plated silver alloy contacts, designed for both dynamic and static applications. These contacts boast remarkable conductivity and resilience, providing a reliable connection in all environments.
Δ Silver Alloy Contacts (High Conductivity & Superior Arc Resistance): Our silver alloy contacts are crafted for peak performance, offering exceptional conductivity and unmatched arc resistance. This ensures your circuit breaker operates with maximum efficiency and safety, even in the most demanding situations.
Δ Thick Copper-Plated Silver Busbars (Standard In/Out Terminals): Built with precision, our robust busbars are copper-plated silver, providing a standard yet superior solution for in/out terminals. These components guarantee a seamless and enduring connection, enhancing the reliability of your electrical distribution.
Δ PCB Reliability (48-Hour Aging Test Verified): Our printed circuit boards are rigorously tested with a 48-hour aging process to ensure stability and reliability. This verification process underscores our dedication to quality and the assurance that our breakers can withstand the test of time under operational stress.
Installation Instructions
· The MTN and MTH models, ranging from 800A up to 6300A (excluding the 4000A model), boast the impressive feature of having the same connection terminals, ensuring seamless and consistent installation.;
No additional space is required for front connections, as the innovative design of the terminals ensures that the depth of the circuit breaker remains unchanged;
· For an effortless connection to either a horizontal or vertical busbar, simply adjust the connection terminal by rotating it 90 degrees for optimal orientation.
Mechanical Operation Test:
Thoroughly examine the mechanical operation of the circuit breaker to ensure it is flexible and reliable.
Assess the operational efficiency of critical functions, including closing, opening, and energy storage.
Comprehensive Electrical Performance Testing:
Insulation Resistance Test: Utilize a megohmmeter to ascertain the insulation resistance of both main and auxiliary circuits, validating compliance with industry standards (typically ≥ 1M Ω).
Power Frequency Withstand Voltage Test: Administer the rated power frequency voltage (for example, 2500V/1min) across main and auxiliary circuits to evaluate insulation integrity.
Contact Resistance Test: Precisely measure the contact resistance of the main contact, ensuring it remains within the specified limits (commonly at the micro ohm level).
Robust Protection Function Test:
Evaluate the response values and timings of protection features, including overload, short circuit, and ground fault.
Confirm the settings andfunctionality of the intelligent release device for optimal performance.
Outer packaging:
Our packaging solution ensures the utmost security and reliability for your product. Robust wooden boxes are typically employed to deliver exceptional mechanical strength and protective assurance.
These wooden crates are ideal for accommodating large circuit breakers and facilitating international transport.
Inner packaging:
The circuit breaker is carefully encased using premium buffer materials such as foam pads, bubble film or pearl cotton , providing superior protection against vibrations and impacts.
For larger circuit breakers, the packaging box may feature a sophisticated layered design, with all necessary accessories (such as manuals, tools, and spare parts) conveniently placed on the upper layer for easy access.
Domestic transportation
When using a designated freight forwarder in China, products are seamlessly delivered to the specified destination via road transportation or domestic express services , ensuring prompt delivery post-production completion.
International transport
For urgent, small-quantity shipments requiring international delivery, we employ the expertise of leading international express carriers to a designated global location,selecting among the top three in the industry:
DHL, FEDEX, and UPS.
Sea freight/air freight
For larger consignments where there is no immediate time constraint, sea freight is our preferred option. We collaborate with a reliable freight companyto coordinate the collection of goods via trucks for transport to the appointed port for warehousing.They are subsequently shipped by sea to the customer's specified port, where the consignee is responsible for retrieving the goods using a bill of lading.
Mingtuo Electric Mingtuo Electric proudly commands a significant presence in the domestic market and is progressively making its mark on the international stage. Our high-quality products are the preferred choice across diverse sectors, including construction, industry, and energy, earning the trust and favor of numerous prestigious engineering projects worldwide.
The company upholds the unwavering tenet of customer first, quality first, service first, and reputation first and relentlessly pursues a philosophy centered on innovation and progressive development. The company boasts immense technical prowess, cutting-edge production techniques, and a wealth of seasoned expertise in research and development, establishing itself as a beacon of professionalism and technological mastery. Equipped with China's most advanced suite of production, testing, and inspection apparatus, we ensure unparalleled quality and reliability.
FAQ
Q: What is the product voltage/current range? What's the breaking ability?
A: For comprehensive details, please reach out to our attentive customer service team.
Q: What is the MOQ? Do you support sample ordering?
A: Our minimum order quantity is set at 1 unit, and we are pleased to offer the option of sample orders to our clients.
Q: How long is the warranty period? How to apply for warranty?
A: The product comes with a warranty of one to two years. Warranty applications can be conveniently submitted through our customer service.
Q: Do you have CE, RoHS, UL and other certifications? Can you provide a certificate?
A: Yes, we possess CE and RoHS certifications and are happy to provide certificates upon request.
Q: Does the price include tax/shipping?
A: Prices are exclusive of shipping and tax.
Q: What famous clients or project cases have you worked with?
A: Our esteemed clientele includes industry giants such as State Grid of China, Chint Group, and Xiaomi Group.