Residual current circuit breaker
with over-current protection
- Over 10 years of experience in manufacturing RCBO
- Fast production delivery capability
- Provide product customization
- 24*7 online service for you
Our products
CNTN Electric primarily manufactures RCBO series products, including integrated residual current circuit breakers, 1P+N type, electronic type, and electromagnetic type models. The following products are our most popular miniature circuit breaker series, designed to meet your power needs in various scenarios.
6 benefits you can get from CNTN electric?
Ultra safe
CNTN uses only high-quality materials to RCBO, 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
residences
RCBO uses “one main unit per household + branch circuit protection” to provide full electrical safety for homes. It prevents main line leakage/overcurrent, tackles higher leakage in humid areas and overcurrent with multiple high-power appliances, and guards against socket leakage from faulty devices.
office building
In commercial buildings with complex electrical loads and dense crowds, RCBO is mandatory/recommended to cut electrical accident risks. For numerous, frequently-used devices, socket and high-power circuits need separate RCBOs to avoid fires from equipment-failure-induced leakage or overcurrent.
factories
In industrial scenarios, RCBO offers precise protection for specific equipment, mainly used in setups requiring high “human-machine safety”. It safeguards operators via residual current protection, prevents line damage from equipment internal short circuits, and quickly cuts off faulty circuits to ensure operational safety.
new energy systems
In Photovoltaic and new energy circuits with complex AC/DC current, RCBO features AC-DC hybrid leakage detection. It covers all leakage types in photovoltaic inverters, energy storage batteries, etc., triggers timely protection, and ensures safe, stable operation of new energy systems.
Hospitals
In medical settings where patients contact electrical devices, RCBO meets high safety demands. It detects pulsating DC leakage, identifies medical equipment’s special leaks, and delays tripping to avoid unnecessary outages, ensuring life-support gear runs continuously.
charging pile
RCBO cuts power during circuit overload or short-circuit (similar to MCB) and detects leakage current (similar to RCD). Charging piles, with high power (usually ≥7kW) and long operation, face higher leakage risks. RCBO’s rapid power-off at 30mA leakage current effectively prevents electric shock accidents.
Where do you want to use our MCBs?
Frequently asked questions
What is a Residual Current Circuit Breaker with Overcurrent Protection （RCBO） ?
Residual current circuit breakers provide protection against residual current, overcurrent, and short circuits in electrical circuits.
They are widely used in low-voltage power distribution systems to prevent electric accident shocks or electrical fires, thus ensuring the safety of personnel and equipment.
How RCBOs work？
- It provides real-time monitoring of current dynamics in both the live and neutral wires, features sensitive residual current detection, stable and reliable overcurrent protection, and its integrated design saves cabinet space.
- When a leakage current or electric shock is detected in the circuit, which poses a risk of electric shock, the RCBO will react immediately and trip the circuit.
- When a short circuit or overload occurs in the circuit, the RCBO will instantly cut off the power, which is similar to the function of an MCB.
Can an RCBO be a main switch?
An RCBO can be used as a main switch, but its suitability depends on the power distribution scenario and electrical regulations.
RCBOs are suitable as main switches in residential buildings or small shops, but they are not recommended for use as main switches in large buildings and industrial power distribution systems.
Will a RCBO trip before a fire starts?
RCBOs cannot extinguish a fire once it has already started, but they can prevent or reduce the likelihood of electrical fires by preventing electrical faults before a fire occurs.
What are the common faults of RCBOs?
During long-term use, RCBOs (Residual Current Circuit Breakers with Overcurrent Protection) can experience various malfunctions due to electrical aging, environmental factors, and incorrect operation.
Common faults include: nuisance tripping, failure to trip when protection is needed, delayed tripping response, aging of internal components, oxidation of terminals, failure to close the circuit, difficulty in opening the circuit, and contact faults (manifesting as contact oxidation, burning, poor contact, and insufficient spring pressure on the contacts).
What is the difference between an RCBO and an RCCB?
The core difference between RCBO and RCCB lies in the completeness of their protection functions.
RCBOs are integrated devices, providing dual protection in a single unit, and can be directly used in terminal power circuits without needing other switches.
They will trip in case of leakage, overload, or short circuit. RCCBs, on the other hand, need to be used in combination with MCBs and are purely leakage protection devices.
They will only trip in case of leakage; overload/short circuit protection relies on the accompanying MCB.
Types of Residual Current Circuit Breaker with Overcurrent Protection （RCBO）
There are many types of RCBOs. If you are unsure how to choose, please refer to our description:
1. Classified by leakage current detection type: Type A residual current circuit breaker (basic type, suitable for most residential applications); Type B residual current circuit breaker (advanced type, suitable for scenarios with DC components).
2. Classified by tripping method: Electromagnetic residual current circuit breaker (mechanical tripping, strong anti-interference ability); Electronic residual current circuit breaker (triggered by electronic signal, high sensitivity).
3. Classified by installation type: Modular residual current circuit breaker (mainstream type, suitable for standard distribution boxes); Molded case residual current circuit breaker (high current type, suitable for high-power circuits).
4. Classified by special functions (designed for specific scenario needs): Time-delay residual current circuit breaker (to avoid false tripping caused by transient interference); Residual current circuit breaker with alarm function (fault visualization).
What certifications do our products have?
CNTN’s RCBOs 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.
Is customization available?
CNTN Electric can provide customized services based on your needs.
Please contact us if you would like to learn more.
Our certifications
Our partners worldwide
Contact us now to get our latest prices!
We’d love to introduce our company to you! If you’d like to learn more, please leave a message below. We guarantee a personalized and comprehensive response within 24 hours. Don’t hesitate to start your journey to exceptional solutions!
