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 formidable breaking capacity of up to 150kA, making it exceptionally suitable for industrial, commercial, and energy distribution systems.
Core features:
Intelligence: Equipped with a state-of-the-art Micrologic release, it supports advanced real-time monitoring (current, voltage, fault recording) and offers seamless remote control, fully compatible with the innovative EcoStruxure platform.
High reliability: Features a robust modular design, offering optional electronic/thermal magnetic protection, with an impressive lifespan rated for tens of thousands of operations.
Comprehensive protection: Ensures reliable overload, short circuit, and ground fault protection, with support for selective coordination.
Flexible Expansion:Can be enhanced with communication modules (Modbus, Ethernet) and auxiliary contacts for diverse applications.
Ideal for data centers, manufacturing facilities, and large-scale buildings, distinguished for its high security, digital management, and efficient energy conservation, all while adhering to IEC/GB standards.
Working principle:
The air circuit breaker consistently monitors the electrical current via a high-precision current transformer, transmitting the data to the intelligent controller.
When the intelligent controller detects any abnormal current, it promptly disconnects the internal contacts of the circuit breaker to safely cut off the circuit, ensuring optimal 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: Unveil the groundbreaking innovations and unparalleled features that elevate our Premium Quality ACB Air Circuit Breaker to new heights of performance and trustworthiness.
Δ High-Temperature Resistant & Flame-Retardant Casing: Meticulously engineered to brave even the harshest conditions, this casing promises unwavering safety and longevity across all operational environments.
Δ Copper-Plated Silver Alloy Contacts (Dynamic/Static): Discover the epitome of conductivity and dependability with our expertly crafted contacts, designed for superior electrical performance.
Δ Silver Alloy Contacts (High Conductivity & Superior Arc Resistance): Revel in supreme conductivity and outstanding arc resistance, ensuring seamless and efficient electrical connections.
Δ Thick Copper-Plated Silver Busbars (Standard In/Out Terminals): Designed for endurance, our durable busbars guarantee stable and secure current flow, adhering to the highest industry standards.
Δ PCB Reliability (48-Hour Aging Test Verified): Count on our rigorously tested PCBs, thoroughly validated through comprehensive aging tests to assure enduring performance and reliability.
Installation Instructions
· Our MTN and MTH models, expertly engineered with precision, cater to a wide range of applications with capacities from a robust 800A up to an impressive 6300A (excluding 4000A), exemplifying unmatched craftsmanship in design. These models are equipped with the same robust connection terminals;
Effortless installation is paramount! Our terminals are ingeniously designed to maintain the circuit breaker's original depth, eliminating the need for extra space allocation for front connections.
· Designed for both horizontal and vertical busbar connections, our products promise seamless integration. Simply rotate the connection terminal by 90 degrees to achieve optimal alignment, ensuring a perfect fit every time.
Mechanical Operation Test: Guaranteeing Unwavering Performance
Conduct a comprehensive examination of the mechanical operation of the circuit breaker to confirm that it remains supremely flexible, yet unfailingly reliable,offering peace of mind.
Meticulously test every operational function, which includes: seamless closing,smooth opening,as well as efficient energy storagemechanisms.
Electrical Performance Testing: Our Pillar of Safety Assurance
Insulation Resistance Test: Utilize a precision megohmmeter to meticulously measure the insulation resistance across main and auxiliary circuits, ensuring absolute compliance with industry standards (typically ≥ 1M Ω).
Power Frequency Withstand Voltage Test: Apply the designated power frequency voltage (e.g., 2500V for 1 minute) to both main and auxiliary circuits, rigorously evaluating their insulation capabilities under pressure.
Contact Resistance Test: Precisely measure the contact resistance of the primary contact to assure it consistently stays below the stipulated threshold (generally at the micro-ohm precision level).
Protection Function Test: An Unyielding Shield for Your Equipment
Scrutinize the action values and timing of protection functions, with particular attention to critical areas such as overload, short circuit, and ground fault scenariosto ensure full coverage.
Diligently verify the calibrations and operational efficacyof the intelligent release device, securing top-tier performance every time.
Outer Packaging:
To ensure utmost protection of your valuable products, we employ robust wooden boxes which are meticulously crafted to deliver exceptional mechanical strength and resilience.
These highly durable wooden crates are tailored for transporting large circuit breakers, making them perfect for secure international logistics.
Inner Packaging:
To safeguard the integrity of the circuit breaker, we utilize superior-grade buffer materials such as foam pads, bubble film or pearl cotton to effectively mitigate vibrations and collisions, ensuring the product arrives safely.
For larger circuit breakers, our packaging system boasts a sophisticated layered design, with essential accessories like manuals, tools, and spare partsstrategically positioned on the upper layer for effortless access.
Domestic Transportation:
If you have a designated freight forwarder in China, you can rest easy knowing we will seamlessly coordinate to transport your products via road transportation or domestic express services, ensuring swift and efficient delivery upon the completion of production.
International Transport:
For smaller shipments that require expedited delivery to specific international locations, we place our trust in the prestigious and efficient services of the world's top three express delivery giants:
DHL, FEDEX, and UPS.
Sea Freight/Air Freight:
For larger, bulk shipments where time constraints are more flexible, we opt for reliable sea freight. Our team expertly coordinates with a trustworthy freight company, who will manage truck pickup and ensure seamless transport to the designated port for warehousing.Finally, the cargo is securely shipped by sea to the customer's specified port, ready for collection with a bill of lading.
Mingtuo Electric Zhejiang Mingtuo Electric Technology Co., Ltd. shines as a formidable leader in the domestic industry, zealously extending its prowess onto the global stage. Our exceptional products, favored across the construction, industry, and energy sectors, are the top choice for numerous prestigious engineering projects. We have earned the unwavering trust and admiration of our esteemed clients.
The company adheres to the principle of putting customers first, prioritizing quality, excellence in service, and maintaining an impeccable reputation, and we are resolute in our relentless pursuit of innovation and development. Our company stands on a solid foundation built by remarkable technical strength, state-of-the-art production technology, and vast experience in research and development. Distinguished by our professionalism and technological supremacy, we pride ourselves on a full 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: To obtain comprehensive details regarding voltage, current range, and breaking ability, kindly reach out to our expert customer service team.
Q: What is the MOQ? Do you support sample ordering?
A: Our minimum order quantity is exceptionally accommodating at merely 1 set, and we are delighted to offer sample orders to suit your requirements.
Q: How long is the warranty period? How to apply for warranty?
A: We provide a generous warranty spanning from one to two years. To apply for warranty service, please contact our dedicated customer service specialists directly.
Q: Do you have CE, RoHS, UL and other certifications? Can you provide a certificate?
A: Absolutely, we proudly possess CE and RoHS certifications and will gladly furnish these certificates upon request.
Q: Does the price include tax/shipping?
A: Please be advised that our pricing does not cover shipping and tax fees.
Q: What famous clients or project cases have you worked with?
A: We are honored to have collaborated with prominent clients such as the State Grid of China, Chint Group, and Xiaomi Group, which underscores our unwavering commitment to excellence and dependability.