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Upgrade your electrical protection with our high-performance molded case circuit breakers. With advanced technology and robust construction, these breakers guarantee enhanced safety and efficiency for your electrical systems, offering peace of mind.

TSM8 molded case circuit breaker

TOSUNLUX molded case circuit breaker

With TOSUNlux molded case circuit breaker, you can have peace of mind knowing that your electrical systems are safeguarded against potential risks, making it the ideal choice for reliable and durable protection.

Our range includes the powerful TSM8 molded case circuit breaker with Breaking Capacitors F=36KA, N=50KA, and H=70KA. With the TSM8’s dual rotary contact structure and energy release system, you can trust in stable and dependable protection, along with outstanding current-limiting capabilities. The breaker also features a transparent aluminum cover, safeguarding your trip unit, rotary handle, and motor operation mechanism. It can also withstand the effects of oil, mist, mold, humid air, salt spray, etc. Versatile and adaptable, TOSUNlux molded case circuit breakers cater to diverse applications, ensuring your electrical systems are well-protected. 

TOSUNLUX molded case circuit breakers

TOSUNlux offers different models of Molded Case Circuit Breakers to meet your needs for safe and reliable solutions.

TSM3S Thermal Adjustable Type Moulded Case Circuit Breaker

TSM3E Electronic Type Moulded Case Circuit Breaker

TSM4E Electronic Type Moulded Case Circuit Breaker

TSM4 Moulded Case Circuit Breaker

TSM3 Moulded Case Circuit Breaker

TSM2 Moulded Case Circuit Breaker

Why Choose TOSUNlux Brand?

There are several reasons to choose TOSUNLUX mccb circuit breakers for your electrical needs:

Full-Range of Products

TOSUNlux provides a comprehensive selection of high-quality circuit breakers and other low-voltage electrical distribution applications, meeting diverse needs with precision.

Strong Team of 200 People

Our dedicated team of 200+ professionals, fueled by expertise and innovation, strives to deliver top-notch products and exceptional customer service.

Highest Cost-Performance

TOSUNlux products offer an unbeatable cost-performance ratio, assuring you of superior quality and optimal functionality without breaking the bank

Quality Assurance and Certification

Rest easy with our rigorously tested products holding necessary certifications, a testament to our commitment to reliability and industry compliance.

Around 3 Decades of Experience

With nearly three decades of trusted experience, TOSUNlux stands as a reputable brand that understands and fulfills your electrical requirements.

100% Safety

Safety remains paramount; our circuit breakers and solutions are meticulously designed for maximum protection, minimizing risks, and promoting peace of mind.

About TOSUNlux

TOSUN, established in 1994, is a leading Chinese manufacturer and supplier of low-voltage electrical and lighting products. As the best-molded case circuit breaker Manufacturer, TOSUNlux specializes in the TSM8 model. 

This high-performance circuit breaker offers reliable protection, ensuring safety for various low-voltage electrical applications and systems. Other popular products include TSM3 MCCB, TSM3E Electronic Type MCCB, and TSM3S Thermal Adjustable Type MCCB. 

Quality and Certification

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Here are some frequently asked questions about TOSUNlux molded case circuit breaker

A molded case circuit breaker (MCCB) is a type of circuit breaker housed in a molded case made of insulating material. It offers higher ampere ratings and is more robust, suitable for larger electrical systems. In contrast, a general circuit breaker can refer to various types, including MCCBs, miniature circuit breakers (MCBs), or other specific designs, with varying ampere ratings for different applications.

MCCB is called a “molded case” due to its unique construction. It is enclosed in a molded case made of insulating materials like plastic or resin, which provides enhanced insulation and protection. This robust casing safeguards the internal components from environmental factors, making it durable and suitable for various electrical applications.

The principle of MCCB is based on thermal and magnetic protection mechanisms. When an overload or short circuit occurs, the bimetallic strip in the MCCB heats up, causing it to bend and trip the breaker. Additionally, the magnetic coil generates a magnetic field that trips the MCCB when high fault currents are detected, ensuring efficient and reliable circuit protection.

MCCBs are used in various electrical systems and applications where reliable and efficient circuit protection is required. They find applications in industrial facilities, commercial buildings, power distribution networks, manufacturing plants, data centers, and other settings to safeguard electrical equipment and circuits from overloads and short circuits.


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We proudly collaborate with B2B distributors worldwide. Partner with us to deliver top-notch molded case circuit breakers for unmatched safety and performance. 


Molded Case Circuit Breakers (MCCBs) find extensive applications in various industries.MCCBs offer reliable protection against overloads and short circuits, ensuring the safety of electrical systems, equipment, and personnel. Their versatility allows for usage in motor control centers, distribution panels, generator systems, lighting circuits, and other critical electrical installations. With different ampere ratings and trip characteristics, MCCBs cater to diverse applications, making them an indispensable component in modern electrical systems. 


We Help Your Business to Connect and Grow on Large Scale

TOSUNlux has its own design team with a 5-people in-house design team, which provides 4-5 new series of products every year for our clients.

How to Select the Best molded case circuit breaker?


Selecting the best-molded case circuit breaker (MCCB) is crucial for ensuring optimal electrical safety and performance. With a wide array of options available, it can be overwhelming to make the right choice. This article serves as a comprehensive guide to help you navigate through the selection process. 

What Is A molded case circuit breaker?

A molded case circuit breaker (MCCB) is a type of electrical protection device designed to safeguard electrical systems and equipment from overloads and short circuits. Housed in a molded case made of insulating materials, MCCBs offer enhanced insulation and durability. They function based on thermal and magnetic tripping mechanisms, which detect and interrupt abnormal electrical currents. 

With adjustable trip settings, different ampere ratings, and a range of sizes, MCCBs are versatile and widely used in commercial, industrial, and residential settings. These circuit breakers play a crucial role in ensuring electrical safety, preventing damage to equipment, and minimizing potential hazards. 

How to Select the Best Molded Case Circuit Breaker?

Selecting the best-molded case circuit breaker (MCCB) is vital for ensuring electrical safety and optimal performance in various applications. Here are essential points to consider when choosing the right MCCB for your specific needs:

    •    Electrical Requirements: Understand the electrical system’s voltage, frequency, and current ratings to ensure compatibility with the MCCB.
    •    Load Characteristics: Evaluate the type of load the MCCB will be protecting, such as resistive, inductive, or capacitive, as this affects the trip curve selection.
    •    Trip Curve: Choose the appropriate trip curve based on the nature of the load and the response time needed for the circuit breaker to trip under different fault conditions.
    •    Current Ratings: Select the MCCB with the correct, current rating to handle the maximum load current and withstand any short-circuit currents in the system.
    •    Breaking Capacity: Consider the breaking capacity (KA rating) of the MCCB to ensure it can safely interrupt fault currents in the system without damage.
    •    Overload Protection: Look for MCCBs with adjustable thermal settings to provide accurate and reliable overload protection tailored to your specific application.
    •    Short Circuit Protection: Ensure the MCCB has a robust magnetic tripping mechanism to respond quickly to short-circuit faults, preventing damage to equipment and cables.
    •    Trip Unit Features: Check for advanced features like adjustable time-delay settings, instantaneous trips, and adjustable current settings to fine-tune the protection.
    •    Certifications: Verify that the MCCB holds necessary certifications from recognized testing authorities, indicating compliance with safety and performance standards.
    •    Installation and Mounting: Ensure the MCCB’s dimensions and mounting arrangements are suitable for the intended panel or distribution board.
    •    Cost-Effectiveness: Balance the cost of the MCCB with its performance and features, ensuring you get the best value for your investment.

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