Miniature circuit breaker
- Over 10 years of experience in manufacturing MCB
- Rapid production and delivery capabilities
- OEM and ODM opitional
- 24*7 online service for you
6 benefits you can get from CNTN electric?
Ultra safe
CNTN uses only high-quality materials to manufacture miniature circuit breakers, which ensures you use electricity more safely.
Various certifications
Every year, CNTN invests around 1 million RMB in various certifications, including CE, RoHS, ISO9001, and CCC, so you can use our products with confidence.
100% product test
CNTN's miniature circuit breakers undergo 100% testing before leaving the factory. This takes a lot of time, but it's worth it. By doing so, we can ensure your electrical safety.
Factory direct sale
CNTN is a Chinese manufacturer and supplier of miniature circuit breakers (MCBs). We have 30 professional employees ready to serve you.
Flexible MOQ
We accept small trial orders for new markets, as well as bulk orders from established distributors and projects.
Rich export experience
We have extensive experience exporting products to Europe, the Middle East, Southeast Asia and the Americas, so you can completely trust us.
In what situations are our MCBs suitable?
Family residences
In residential homes, miniature circuit breakers (MCBs) are installed in the home distribution box and used to protect electrical safety in lighting circuits, socket circuits, high-power household appliance circuits, and main home switches.
Shopping malls
MCBs can be used to meet the complex power needs of commercial settings, covering both single-phase and three-phase circuits, and require a balance between “multi-circuit protection” and “equipment stability”.
Industrial sector
In industrial settings, MCBs are suitable for the special power requirements of 380V three-phase circuits/industrial equipment, focusing on surge current resistance and stable protection, and mostly adopting D-type trip curves.
new energy field
In the field of new energy, miniature circuit breakers (MCBs) can be used for power distribution on the low-voltage side of household photovoltaic inverters and for the output circuits of small energy storage devices.
small household appliance
Miniature circuit breakers provide built-in protection for small household appliances: they protect the appliances themselves from overloads/short circuits and prevent equipment failures from spreading to the main circuit.
Where do you want to use our MCBs?
Frequently asked questions
What is a Miniature Circuit Breaker (MCB)?
Miniature Circuit Breaker (MCB) is a small electrical device that protects circuits from damage caused by overcurrent or short circuits.
It automatically interrupts the current flow when it exceeds safe limits, preventing potential hazards such as fires or equipment failure.
MCBs are commonly used in residential and commercial electrical systems for reliable and efficient circuit protection.
What do the terms MCB, MCCB and RCBO stand for
MCB – Miniature Circuit Breaker. MCCB – Molded Case Circuit Breaker. RCBO – Residual Current Circuit Breaker with Overcurrent protection.
What is an MCB used for?
MCB stands for Miniature Circuit Breaker. MCBs are suitable for overload and short-circuit protection in low-voltage circuits.
They are compact, have moderate breaking capacity, and are commonly used in household power distribution systems. They are also reusable.
What is the working principle of a miniature circuit breaker (MCB)?
Micro circuit breakers (MCBs) monitor the current flowing through the circuit in real-time. Under normal conditions, they remain closed (allowing current to pass).
If the current exceeds the preset ‘rated current’, the MCB will automatically ‘trip’ (disconnect the circuit), cutting off the power to prevent overheating, melting of wire insulation, or electrical fires. electromagnetic.
Types of miniature circuit breakers (MCBs)
Miniature Circuit Breakers (MCBs) are categorized based on multiple criteria to suit different electrical systems, load types, and safety requirements.
The most critical classifications include tripping curves (response to overcurrent), pole configuration (number of circuits protected), current rating (maximum safe current), and specialized designs for specific applications.
Below is a detailed breakdown of each type, their characteristics, and typical uses.
Based on the curve differences, CNTN Electric can provide three types of miniature circuit breakers, as described below:
Type B MCBs
Type B Miniature Circuit Breakers (MCBs) trip sensitively when the current reaches 3 to 5 times their rated current. Designed for circuits with low inrush current, they are typically used in residential or commercial wiring, such as lighting circuits, sockets, and small household appliances.
Type C MCBs
Type C Miniature Circuit Breakers (MCBs) trip sensitively when the current reaches 5 to 10 times their rated current. As common overcurrent protection devices in low-voltage power distribution systems, they are mainly used for residential, commercial, and small-scale industrial loads that have a certain level of inrush current during startup, but with non-extreme inrush intensity.
Type D MCBs
A Type D miniature circuit breaker (MCB) trips sensitively when the current reaches 10 to 20 times its rated current. Its core feature is high tolerance to “inrush current”, and it is specifically designed for inductive loads with large starting surges or industrial scenarios.
What are the differences between miniature circuit breakers (MCBs) and molded case circuit breakers?
The main difference between miniature circuit breakers (MCBs) and molded case circuit breakers (MCCBs) lies in the amount of current they can handle.
Miniature circuit breakers are designed for end-users and are typically used to handle very small currents. MCBs have a maximum current rating of 63 amperes, while MCCBs can handle much higher currents.
CNTN manufactures MCBs with current ratings ranging from 6 amperes to 63 amperes, and MCCBs with current ratings ranging from 63 amperes to a maximum of 800 amperes.
What certifications do our products have?
CNTN’s MCBs are certified with both CCC and CE certificates.
The CCC certificate is the strictest certification in China, guaranteeing the highest level of safety and minimizing the risk of fire and electric shock during use.
If you require other certifications, such as UL, CSA, UKCA, ETL, or RoHS, we can also provide them upon request. Please contact us for more information.
Can AC circuit breakers be used for DC?
AC circuit breakers cannot be used to interrupt DC circuits.
The arc generated during DC interruption is particularly strong, and only specially designed DC circuit breakers are equipped with powerful arc suppression mechanisms to handle this problem.
Using an AC circuit breaker instead would easily create safety risks for your power system.
What is CNTN Electric's warranty policy?
Our customer complaint rate is below 0.1%.
When a product issue arises, we provide different solutions depending on who is responsible.
If the problem is due to us, we will replace the product with a new one.
If the problem is due to the user, we will provide free replacement parts.
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