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 vigilantly monitors the current flowing through the circuit in real-time using a highly efficient current transformer, transmitting the current signal to the intelligent controller.
Upon detecting any abnormal current, the intelligent controller swiftly disconnects the contacts within the circuit breaker to safeguard the circuit by cutting off the power flow.

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: Our High Performance ACb Switch Circuit Breaker is engineered to redefine safety and efficiency with cutting-edge technology and superior materials. Let's dive into the highlights that make this essential safety breaker a standout choice.
Δ High-Temperature Resistant & Flame-Retardant Casing: Crafted to withstand extreme conditions, our casing ensures optimal protection and extends the lifespan of the circuit breaker, preventing overheating and ensuring reliable performance.
Δ Copper-Plated Silver Alloy Contacts (Dynamic/Static): Experience the perfect blend of durability and superior electrical conductivity. Our contacts are designed for seamless performance, enhancing the reliability of your power systems.
Δ Silver Alloy Contacts (High Conductivity & Superior Arc Resistance): These contacts offer unparalleled conductivity and arc resistance, ensuring safe and stable operations even under heavy electrical loads.
Δ Thick Copper-Plated Silver Busbars (Standard In/Out Terminals): Our busbars boast enhanced thickness and premium materials, guaranteeing robust connectivity and optimal performance across all terminals.
Δ PCB Reliability (48-Hour Aging Test Verified): Rigorously tested over 48 hours to certify exceptional performance and reliability, our PCB design stands up to the most demanding standards, ensuring consistent and long-lasting functionality.
Installation Instructions
·Both MTN and MTH models, ranging impressively from 800A to a robust 6300A (excluding the 4000A variant), boast the same innovative connection terminals;
Ingeniously designed, there's no need to reserve space for front connections, as the terminals are crafted to maintain the original depth of the circuit breaker, ensuring efficiency and compactness;
·For effortless connection to either horizontal or vertical busbars, simply adjust the connection terminal by a precise 90 degrees for seamless integration.
Mechanical Operation Test: Ensuring Smooth Functionality
Evaluate the precision and efficiency of the circuit breaker's mechanical operation to confirm it's not only flexible in movement but also unfailingly reliable.
Assess the operational capabilities including the pivotal functions of seamless closing, unwavering opening, and the critical energy storage process.
Electrical Performance Testing: Elevating Safety Standards
Insulation Resistance Test: Deploy a megohmmeter to meticulously measure the insulation resistance across both the main and auxiliary circuits, ensuring they exceed standard benchmarks (commonly ≥ 1M Ω).
Power Frequency Withstand Voltage Test: Impressively apply rated power frequency voltage (e.g., 2500V/1min) to the main and auxiliary circuits to rigorously verify insulation integrity.
Contact Resistance Test: Accurately assess the contact resistance of the primary contact, confirming it remains beneath the stipulated threshold (typically at the micro ohm level).
Protection Function Test: Safeguarding What Matters
Scrutinize the response values and timing of vital protection functions such as overload, potential short circuit incidents, and ground fault occurrences.
Thoroughly verify the precision settings androbust functionality of the advanced intelligent release device, ensuring peak performance.
Outer Packaging:
Our commitment to durability is showcased in the packaging of our High Performance ACb Switch Circuit Breaker - Essential Safety Breaker. We utilize robust wooden boxes that are meticulously crafted to provide exceptional mechanical strength, ensuring your product arrives in pristine condition.
These wooden crates are particularly suited for large circuit breakers or when managing international transportation, offering unparalleled protection.
Inner Packaging:
The circuit breaker is enveloped with premium buffer materials such as foam pads, bubble films or pearl cotton , meticulously designed to shield against vibrations and collisions, preserving the integrity of the product.
For larger circuit breakers, a thoughtful layered design in the packaging box is employed. Accessories like manuals, tools, and spare partsare conveniently positioned on the upper layer for easy access.
Domestic Transportation
For products bound within China, if a specified freight forwarder is appointed, we ensure safe and prompt delivery to the designated location via road transportation or domestic express service upon the completion of production, ensuring timely arrival.
International Transport
For smaller shipments with urgent timelines destined for international locations, we partner with the top-tier international express companies, including
DHL, FEDEX, and UPS, ensuring swift and reliable delivery.
Sea Freight/Air Freight
For substantial shipments where time permits, sea freight is our preferred option. We collaborate with a reputable freight companythat arranges seamless truck pickup, transporting your goods to the designated port for warehousingand final maritime transit. Upon arrival at the customer's specified port, retrieval is facilitated with a bill of lading, ensuring a smooth handover.
Mingtuo Electric Mingtuo Electric not only holds a pivotal position in the domestic market, but is also progressively marking its presence on the international stage. Our products are extensively embraced in sectors like construction, industry, and energy, earning the trust and admiration of a multitude of engineering ventures.
The company adheres to the principle of customer first, quality first, service first, reputation first and relentlessly pursues the ethos of innovation and development. Mingtuo Electric boasts robust technical prowess, cutting-edge production technology, and rich experience in research and development, establishing itself as a beacon of professionalism and technological leadership. We house 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, kindly reach out to our customer service.
Q: What is the MOQ? Do you support sample ordering?
A: The minimum order quantity is 1 set, and we are pleased to support sample ordering.
Q: How long is the warranty period? How to apply for warranty?
A: Our products come with a warranty of one to two years. For service application, please contact our customer service.
Q: Do you have CE, RoHS, UL and other certifications? Can you provide a certificate?
A: We hold CE and RoHS certifications. Certificates are readily available upon request.
Q: Does the price include tax/shipping?
A: The listed price excludes both shipping and tax.
Q: What famous clients or project cases have you worked with?
A: We are proud to have collaborated with renowned clients such as the State Grid of China, Chint Group, and Xiaomi Group.