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.
CNTN is a manufacturer of low-voltage electrical products based in Wenzhou, Zhejiang, China, dedicated to providing you with worry-free circuit protection.
Our company upholds the philosophy of “Quality First, Customer Foremost.” We connect every link within the electrical ecosystem to collectively build a smarter, more sustainable future.
CNTN upholds the philosophy of “Quality First, Customer Foremost.” We connect every link within the electrical ecosystem to collectively build a smarter, more sustainable future.
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.
In what situations are our MCBs suitable?
Communication Base Station
In communication base stations, DC circuit breakers efficiently resolve the complex challenge of DC arc extinction, offering rapid and stable interruption capabilities; they are perfectly suited for integration into the power supply circuits of core equipment such as base station rectifiers, battery banks, BBUs, and RRUs.
Energy Storage Power
In energy storage systems, DC circuit breakers enable precise overload protection and rapid short-circuit disconnection. By effectively mitigating safety hazards—such as battery overheating caused by overcurrents and wiring fires—they play a vital role in safeguarding the secure operation of energy storage battery packs.
new energy systems
It enables precise control over circuit safety throughout the entire process of power generation, storage, and transmission; it automatically limits current in the event of an overload and instantly cuts off power during a short circuit, thereby effectively eliminating safety hazards such as arc-induced fires and equipment damage.
transportation hubs
Within transportation hubs, this DC power supply system adapts to on-board power needs, station energy storage, intelligent low-voltage systems, DC lighting and auxiliary power circuits. It enables precise disconnection and responsive protection with robust dual safeguards against overloads and short circuits.
Charging Pile
It efficiently dissipates DC arcs, provides rapid interruption response, and features dual overload and short-circuit protection. It also monitors charging current and voltage in real time, promptly blocking abnormal currents and eliminating risks such as leakage fires and charging failures causing shutdowns.
Smart Home System
In a smart home environment, DC circuit breakers are utilized to power a comprehensive range of systems—including smart lighting, security surveillance, smart appliances, and low-voltage audio-visual equipment—and are custom-engineered specifically for residential low-voltage DC electrical systems.
Factory Insight
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.
Our certifications
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