DC Miniature circuit breaker
- Over 10 years of experience in manufacturing DC Miniature Circuit Breakers (MCB).
- Rapid production and delivery capabilities
- Provide product customization
- 24*7 online service for you
Our reliable products for you
CNTN Electric primarily manufactures DC miniature circuit breakers, utilizing flame-retardant casings. They integrate overload protection, short-circuit protection, and isolation functions to ensure stable operation and electrical safety of your DC power distribution system. We are a leading circuit breaker manufacturer in China.
6 benefits you can get from CNTN electric?
Ultra safe
CNTN uses only high-quality materials to DC 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.
Application Scenarios of DC Miniature Circuit Breakers (MCB)
Rail Transit
In the rail transit, this product features vibration resistance and can withstand a wide temperature range (-40℃ to 85℃), making it suitable for the jolting of train operation and extreme outdoor temperature environments. With a rapid response time of milliseconds, it can immediately interrupt the circuit in the event of a short circuit in the traction system, thereby protecting the train’s traction motor and ensuring passenger safety.
When this product is used in marine applications, its core advantages lie in its ability to precisely meet the demands of ship DC systems for resistance to harsh environments, critical power protection, and space savings. It solves the unique circuit protection challenges encountered during ship navigation, reliably ensuring the safe operation of low-voltage DC equipment and emergency systems on board.
Our DC miniature circuit breakers are the ideal choice for electric vehicle charging stations. This compact DC circuit breaker features instantaneous fault response, is easy to install, and saves space. It completely eliminates hazards such as overloads and short circuits during the charging process, ensuring efficient and worry-free charging every time! You can click the below button to get more information.
New Energy
When used for charging piles, it precisely meets their core needs: high current tolerance, fast fault response and space-saving installation. It addresses hazards like overload/short circuit during charging, reliably protecting charging piles’ DC circuits and users’ equipment.
Electric Vehicle
Our DC MCB the core requirements of the on-board DC system in electric vehicles, including robust safety protection, optimal space adaptability, and reliable performance under harsh environments. It ensures every journey stays completely free from electrical hazards
Where do you want to use our DC MCBs?
Frequently Asked Questions
What Is A DC miniature Circuit Breaker?
What is the working principle of a DC miniature circuit breaker (MCB)?
The core function of a small DC circuit breaker is to monitor the circuit status via its internal sensitive components.
When faults such as overload or short circuit occur, it quickly cuts off the circuit to provide protection.
Types of DC Miniature Circuit Breakers (DC MCB)
The difference between miniature circuit breakers and DC miniature circuit breakers.
Can DC circuit breakers be used for AC?
In emergency situations, a DC circuit breaker can be temporarily used to replace an AC circuit breaker.
However, from the perspective of protection accuracy and cost-effectiveness, an AC circuit breaker matching the circuit type must be used for long-term operation.
This is because the arc extinguishing capability of a DC circuit breaker is higher than that of an AC circuit breaker, and the protection curve of a DC circuit breaker (the action threshold and delay of overload and short-circuit protection) is designed for DC loads, which differs from the protection characteristics of an AC circuit breaker.
Using a DC circuit breaker in an AC circuit for extended periods may result in inaccurate protection actions. Furthermore, the manufacturing cost of a DC circuit breaker is significantly higher than that of an AC circuit breaker of the same specifications.
Therefore, while a DC circuit breaker can be temporarily used in an AC circuit, it is not recommended for long-term or rated operating conditions.
Are outlets AC or DC current?
Standard household electrical outlets provide alternating current (AC).
Direct current (DC) outlets are usually clearly marked and are only compatible with specific devices。
such as charging stations for new energy vehicles (slow charging ports include DC output), dedicated power supply interfaces for some industrial equipment, and DC distribution boxes for solar photovoltaic systems.
What certifications do our products have?
CNTN’s DC MCB 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.
How to resolve product issues?
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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