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: Unlock the future of electrical safety with our Premium Quality ACB Air Circuit Breaker. Boasting state-of-the-art innovations and unrivaled features, it defines excellence in performance and steadfast reliability, elevating standards in electrical systems.
Δ High-Temperature Resistant & Flame-Retardant Casing: Meticulously engineered to conquer extreme conditions, our casing offers unmatched safety and long-lasting durability across all operational environments, safeguarding your applications with confidence.
Δ Copper-Plated Silver Alloy Contacts (Dynamic/Static): Elevate your electrical systems with our precision-crafted contacts, designed to deliver exceptional conductivity and dependability. Experience optimal electrical performance like never before.
Δ Silver Alloy Contacts (High Conductivity & Superior Arc Resistance): Harness the power of superior conductivity and remarkable arc resistance with our advanced contacts, ensuring seamless and efficient electrical connections for enhanced operational excellence.
Δ Thick Copper-Plated Silver Busbars (Standard In/Out Terminals): Experience the pinnacle of stability and security with our robust busbars, expertly built to ensure steadfast current flow while adhering to and exceeding high industry standards.
Δ PCB Reliability (48-Hour Aging Test Verified): Confidence meets assurance with our meticulously verified PCBs. Proven through comprehensive 48-hour aging tests, they guarantee enduring performance and unwavering reliability for your peace of mind.
Installation Instructions
· Discover the excellence of our MTN and MTH models! Ranging from 800A to an awe-inspiring 6300A (excluding 4000A), these models are meticulously engineered with unmatched precision, showcasing the same robust connection terminals that set the standard for durability and reliability;
Effortless installation is a priority! Say goodbye to cumbersome adjustments as our ingeniously designed terminals ensure that no additional space is required for the front connection, maintaining the circuit breaker's depth seamlessly;
· Whether your setup calls for a connection to a horizontal or vertical busbar, our groundbreaking design promises easy integration. With a simple adjustment, pivot the connection terminal by 90 degrees for perfect alignment, ensuring optimal performance and efficiency.
Mechanical Operation Test: Harnessing Uninterrupted Performance
Conduct a meticulous examination of the circuit breaker's mechanical operations to confirm it is effortlessly flexible and steadfastly reliable.
Vigorously assess each operational function, which includes: seamless closing, flawless opening, and efficient energy storage.
Electrical Performance Testing: Setting New Safety Standards
Insulation Resistance Test: Utilize a megohmmeter to meticulously measure the insulation resistance across both main and auxiliary circuits, ensuring it surpasses industry benchmarks (typically ≥ 1M Ω).
Power Frequency Withstand Voltage Test: Administer the rated power frequency voltage (for example, 2500V for 1 minute) to both main and auxiliary circuits to evaluate their superior insulation capabilities.
Contact Resistance Test: Precisely evaluate the contact resistance of the primary contacts to ensure it consistently stays below the defined threshold (generally at the micro-ohm level).
Protection Function Test: Preserving Your Equipment's Integrity
Methodically assess the action values and timing of crucial protection functions, concentrating on safeguards against overload, short circuit, and ground fault incidents.
Diligently verify the settings andoverall functionality of the intelligent release device, ensuring it operates at peak efficiency.
Outer Packaging: The Pinnacle of Protection
We ensure your products are safeguarded by employing robust wooden boxes meticulously crafted to deliver outstanding mechanical strength, offering unparalleled security.
These sturdy wooden crates are perfectly tailored for transporting large circuit breakers, ideal for secure international logistics.
Inner Packaging: Unyielding Defense for Your Circuit Breaker
To protect the circuit breaker, we envelop it in superior buffer materials, such as foam pads, bubble film or pearl cotton to effectively reduce the impact of vibrations and collisions.
For larger circuit breakers, our packaging boasts an advanced layered design, with essential accessories like manuals, tools, and spare partsconveniently positioned on the upper layer, ensuring immediate accessibility.
Domestic Transportation: Seamless and Speedy Delivery
If you have an appointed freight forwarder in China, rest assured that we will seamlessly transport your products via road transportation or domestic express service, ensuring rapid delivery upon the completion of production.
International Transport: Swift and Reliable Solutions
For smaller shipments that require expedited delivery to designated international locations, we depend on the renowned services of the world's top three global express giants:
DHL, FEDEX, and UPS.
Sea Freight/Air Freight: Efficiency Meets Flexibility
For bulk shipments where time allows for flexibility, we prefer sea freight. We expertly collaborate with a reliable freight company, which will arrange for prompt truck pickup and transport to the designated port for warehousing.Finally, the cargo is securely shipped by sea to the customer's specified port, where it awaits pickup with an official bill of lading.
Mingtuo Electric Zhejiang Mingtuo Electric Technology Co., Ltd. has firmly established its reputation as a powerhouse within the domestic market and is now ambitiously expanding its horizons to international territories. Our esteemed products, highly regarded and sought after in the construction, industrial, and energy sectors, are the esteemed choice for numerous prestigious engineering projects. We have earned unwavering trust and admiration from our distinguished clients.
The company adheres to the principle of customer first, quality first, service first, reputation first, and we are unwavering in our commitment to innovation and development. Our company has built a formidable foundation with strong technical strength, state-of-the-art production technology, and extensive experience in research and development. We distinguish ourselves with our professionalism and technological leadership, proudly offering a comprehensive suite 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 on voltage, current range, and breaking ability, we invite you to consult our expert customer service team who will be delighted to assist you.
Q: What is the MOQ? Do you support sample ordering?
A: We offer remarkable flexibility with a minimum order quantity of just 1 set, and are pleased to extend support for sample ordering to cater to your specific needs.
Q: How long is the warranty period? How to apply for warranty?
A: Our exceptional products come with a warranty period ranging from one to two years. To apply for our efficient warranty service, please reach out directly to our dedicated and responsive customer service team.
Q: Do you have CE, RoHS, UL and other certifications? Can you provide a certificate?
A: Yes, we proudly hold CE and RoHS certifications and are delighted to provide these certificates upon your request, ensuring trust and transparency.
Q: Does the price include tax/shipping?
A: Please be informed that our pricing structure is exclusive of shipping and tax fees, allowing for a clear and straightforward cost evaluation.
Q: What famous clients or project cases have you worked with?
A: We have the honor of partnering with renowned clients such as the State Grid of China, Chint Group, and Xiaomi Group, exemplifying our steadfast commitment to excellence and unparalleled reliability.