Introducing the AIR CIRCUIT BREAKER
MT/MVS
ACB (Air Circuit Breaker) is a cutting-edge high-performance low-voltage circuit breaker, featuring exemplary models like MT/NT and MVS series, spanning rated currents from 630A~6300A, boasting an exceptional breaking capacity reaching up to 150kA, making it ideal for industrial, commercial, and energy distribution systems.
Core features:
Intelligence: Equipped with Micrologic release, it supports comprehensive real-time monitoring (current, voltage, fault recording) and enables remote control, fully compatible with the EcoStruxure platform.
High reliability: Its modular design offers optional electronic/thermal magnetic protection, with an operational lifespan reaching tens of thousands of cycles.
Comprehensive protection: Ensures protection against overload, short circuit, and ground fault, also supporting selective coordination.
Flexible Expansion:Modular communication options (Modbus, Ethernet) and auxiliary contacts are easily installable.
Perfectly suited for diverse environments such as data centers, factories, and large buildings, recognized for superior security, digital management, and low energy consumption, all aligned with IEC/GB standards.
Working principle:
This air circuit breaker continuously monitors the circuit's current through an advanced current transformer, transmitting the data to the intelligent controller.
Upon detecting any abnormal current, the intelligent controller promptly disconnects the internal contacts of the circuit breaker to cut off the circuit and ensure safety.

Current |
630A-6300A |
Number of pole |
3P 4P |
Breaking Capacity |
N1,N2,H1,H1B,H2,H3,L1 |
Type |
Fixed Drawer |
Model |
MT/NW/MVS |
Stellar Product Features:
Δ High-Temperature Resistant & Flame-Retardant Casing: Our product is engineered with a robust casing designed to withstand extreme temperatures while preventing the spread of fire, ensuring absolute safety and durability in any environment.
Δ Copper-Plated Silver Alloy Contacts (Dynamic/Static): Featuring dynamic and static contacts coated with a copper-plated silver alloy, this component guarantees impeccable conductivity and remarkable longevity, enhancing the overall efficiency and reliability of the circuit breaker.
Δ Silver Alloy Contacts (High Conductivity & Superior Arc Resistance): Crafted from premium silver alloy, these contacts provide exceptional electrical conductivity and outstanding resistance to electrical arcing, safeguarding your electrical systems with superior performance.
Δ Thick Copper-Plated Silver Busbars (Standard In/Out Terminals): These busbars, plated with copper and silver, are designed to deliver robust and dependable connections for standard input and output terminals, ensuring seamless and reliable electrical distribution.
Δ PCB Reliability (48-Hour Aging Test Verified): Our product's printed circuit board has undergone rigorous reliability testing, confirmed by a 48-hour aging test, to guarantee consistent performance and longevity in all applications.
Installation Instructions
·MTN, MTH800A to 6300A (except 4000A) feature the same connection terminals, ensuring consistent and secure installation.;
Enjoy the convenience of a front connection that requires no extra space, as the sleek design of the terminals maintains the original depth of the circuit breaker;
·Adaptable to both horizontal and vertical busbars, you can effortlessly adjust the connection terminal by rotating it 90 degrees for seamless integration.
1. Mechanical Operation Test:
- Assess the seamless mechanical operation of the circuit breaker to confirm it is both flexible and reliable, promising optimal performance.
- Evaluate operational functions including closing, opening, and energy storage, ensuring each aspect meets rigorous standards.
2. Electrical Performance Testing - Precision Guaranteed:
- Insulation Resistance Test: Conduct a meticulous assessment using a megohmmeter to measure the insulation resistance of both main and auxiliary circuits, ensuring compliance with standards (typically ≥ 1M Ω).
- Power Frequency Withstand Voltage Test: Apply the correct rated power frequency voltage (such as 2500V/1min) to the main and auxiliary circuits, rigorously testing insulation performance.
- Contact Resistance Test: Precisely measure the contact resistance of the main contact, ensuring it remains below specified thresholds (generally at a micro ohm level).
3. Protection Function Test - Safeguarding Operations:
- Verify the crucial action values and timing of essential protection functions, including overload, short circuit, and ground fault, to guarantee robust protection.
- Validate the settings and functionality of the sophisticated intelligent release device, ensuring unparalleled reliability.
Outer packaging:
Robust wooden boxes are typically utilized to ensure exceptional mechanical strength and protection.
A sturdy wooden crate is ideal for both large circuit breakers and international transit, offering reliable safety.
Inner packaging:
Carefully wrap the circuit breaker with protective buffer materials such as foam padding, bubble wrap or pearl cotton to effectively prevent any vibration or collision during transit.
For larger circuit breakers, the packaging might feature a layered design to accommodate accessories such as manuals, tools, and spare partsconveniently on the upper layer.
Domestic transportation
If a designated freight forwarder is available in China, we will transport the products efficiently to the specified location using road transportation or domestic express delivery immediately after the production process is completed.
International transport
When the shipment is small and time-sensitive, requiring quick delivery to a designated location overseas, we rely on the renowned international express services of
DHL, FEDEX, and UPS.
Sea freight/air freight
For larger shipments where time is flexible, we opt for sea freight. Our collaboration with a reliable freight companyensures that trucks are dispatched to collect the goods and transport them securely to the designated port for warehousing.Ultimately, the goods will be transported by sea to the customer's specified port, where the customer must collect them with a bill of lading.
Mingtuo Electric Mingtuo Electric not only commands a significant presence in the domestic market but is also making impressive strides on the global stage. Our products shine across various domains such as construction, industry, and energy, earning the trust and admiration of numerous prestigious engineering endeavors.
The company adheres unwaveringly to the principle of customer first, quality first, service first, reputation first and relentlessly pursues a vision anchored in innovation and development. Our company boasts formidable technical strength, cutting-edge production technology, and extensive experience in research and development, establishing us as leaders in professionalism and technological excellence. We 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 precise details, please reach out to our dedicated customer service team who are eager to assist you with any inquiries.
Q: What is the MOQ? Do you support sample ordering?
A: Our minimum order quantity is one set, and yes, we proudly offer support for sample orders to accommodate your needs.
Q: How long is the warranty period? How to apply for warranty?
A: Enjoy peace of mind with a product warranty ranging from one to two years. For warranty claims, please contact our customer service directly for prompt assistance.
Q: Do you have CE, RoHS, UL, and other certifications? Can you provide a certificate?
A: Indeed, we possess CE and RoHS certifications and are more than happy to furnish these certificates upon request.
Q: Does the price include tax/shipping?
A: Please note that our prices are exclusive of shipping and tax.
Q: What famous clients or project cases have you worked with?
A: We are privileged to collaborate with esteemed clients such as the State Grid of China, Chint Group, and Xiaomi Group, reinforcing our reputation in the industry.