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.
Suitable for scenarios such as data centers, factories, and large buildings, known for high security, digital management, and low energy consumption, in compliance with IEC/GB standards.
Working principle:
The air circuit breaker monitors the current in the circuit in real-time through a current transformer. And transmit the current signal to the intelligent controller.
After the intelligent controller detects the abnormal current, it will disconnect the contacts inside the circuit breaker and cut off the circuit

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 unparalleled advantages of our cutting-edge technology, meticulously engineered to deliver unmatched performance and quality.
ΔHigh-Temperature Resistant & Flame-Retardant Casing: Experience ultimate protection with our robust casing that defies extremes, safeguarding against heat and flames for enduring reliability.
ΔCopper-Plated Silver Alloy Contacts (Dynamic/Static): Benefit from the exceptional durability and efficiency of our dynamic and static contacts, crafted with precision to ensure seamless electrical conductivity.
ΔSilver Alloy Contacts (High Conductivity & Superior Arc Resistance): Enjoy superior reliability and performance with our silver alloy contacts, designed to provide excellent conductivity and outstanding arc resistance.
ΔThick Copper-Plated Silver Busbars (Standard In/Out Terminals): Secure and stable connections are guaranteed with our thick, copper-plated silver busbars, ensuring optimal power flow through standard in and out terminals.
ΔPCB Reliability (48-Hour Aging Test Verified): Trust in proven durability with our PCBs, rigorously tested over 48 hours to verify their reliability and performance under demanding conditions.
Installation Instructions
·For models MTN and MTH ranging from 800A to 6300A (excluding 4000A), enjoy the benefit of the same versatile connection terminals for streamlined installation.;
No additional space is needed for front connections, as the terminals maintain the original depth of the circuit breaker;
·Easily connect on both horizontal and vertical busbars by rotating the connection terminal a convenient 90 degrees.
Mechanical operation test:
Ensure the mechanical operation of the circuit breaker is exceptionally agile and unfailingly reliable.
Assess the operation functions with precision, including seamless closing, smooth opening, and efficient energy storage.
Electrical performance testing:
Insulation resistance test: Utilize a megohmmeter to meticulously measure the insulation resistance of both the main and auxiliary circuits, confirming they comply with stringent standards (typically ≥ 1M Ω).
Power frequency withstand voltage test: Administer the rated power frequency voltage (for instance, 2500V/1min) to both the main and auxiliary circuits to ensure optimal insulation performance.
Contact resistance test: Precisely measure the contact resistance of the main contact, guaranteeing it falls below the designated threshold (commonly at the micro ohm level).
Protection function test:
Diligently test the action values and timing of protection functions, including overload, short circuit, and ground fault.
Confirm and validate the calibrations andoperational efficiency of the advanced intelligent release device.
Outer Packaging:
Robust and Secure wooden boxes are typically employed to ensure optimal mechanical strength and protection.
Wooden crates are ideal for accommodating large circuit breakers or for international shipping needs.
Inner Packaging:
Encapsulate the circuit breaker with high-quality buffer materials such as foam padding, bubble wrap or pearl cotton to effectively mitigate against vibrations and collisions.
For larger circuit breakers, the packaging box may feature a layered design, with essential accessories (such as manuals, tools, spare parts) strategically placed on the upper layer for easy access.
Domestic Transportation
If a specific freight forwarder is appointed within China, we ensure seamless delivery by transporting the products directly to the designated location using road transport or domestic express services once production is finalized.
International Transport
For smaller consignments requiring urgent delivery to an international destination, we collaborate with the leading global express services:
DHL, FEDEX, and UPS.
Sea Freight/Air Freight
For larger shipments with flexible timelines, we opt for sea freight. We meticulously select a reputable freight company, which coordinates seamless truck pick-up and transports the goods to the designated port for warehousing. Subsequently, the shipment is transported by sea to the customer's specified port, where they can retrieve their goods using a bill of lading.
Mingtuo Electric: A Beacon of Excellence Mingtuo Electric not only holds a prestigious position in the domestic market but is also making significant strides on the international stage. Our products are indispensable in sectors such as construction, industry, and energy, earning the unwavering trust and admiration of numerous high-profile engineering projects worldwide.
The company steadfastly upholds the principle of prioritizing our customers, upholding unparalleled quality, delivering first-class service, and maintaining an impeccable reputation.while relentlessly pursuing innovation and development. We proudly possess exceptional technical prowess, state-of-the-art production techniques, and seasoned expertise in research and development. Our reputation for professionalism and technological leadership is unrivaled, underpinned by the most sophisticated production, testing, and inspection equipment available in China.
Frequently Asked Questions (FAQ)
Q: What is the product voltage/current range? What's the breaking ability?
A: For a comprehensive understanding of our product's specifications, 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 a singular set, with the added benefit of supporting sample orders for your convenience.
Q: How long is the warranty period? How to apply for warranty?
A: Enjoy peace of mind with our product warranty that spans one to two years. Warranty applications can be seamlessly processed through our attentive customer service.
Q: Do you have CE, RoHS, UL and other certifications? Can you provide a certificate?
A: Yes, we hold prestigious CE and RoHS certifications and are fully equipped to furnish you with the necessary certificates.
Q: Does the price include tax/shipping?
A: Please be informed that the listed price is exclusive of shipping and tax charges.
Q: What famous clients or project cases have you worked with?
A: Our esteemed clientele includes iconic names such as the State Grid of China, Chint Group, and Xiaomi Group, among others.