YRO RCBO circuit breakers combine residual current protection with overload and short-circuit protection in one compact device. They are designed for individual circuit protection in residential, commercial and industrial electrical distribution systems.
Available configurations can include different rated currents, voltages, pole arrangements, residual current ratings and tripping curves to meet different circuit protection requirements.
What Is an RCBO Circuit Breaker?
An RCBO, or Residual Current Circuit Breaker with Overcurrent Protection, is a protective device that combines residual current protection and overcurrent protection in one unit.
An RCBO can disconnect the protected circuit when it detects conditions such as residual current, overload or short circuit, depending on its rated characteristics and design.
Unlike a conventional MCB, which primarily provides overload and short-circuit protection, an RCBO also provides residual current protection. This makes it suitable for applications where both types of protection are required on the same circuit.
What Does an RCBO Protect Against?
An RCBO provides several types of circuit protection in one device.
Residual Current Protection
The RCBO detects residual current caused by an imbalance between the current flowing through the conductors. When the residual current reaches the specified trip level, the device can disconnect the circuit.
Overload Protection
The thermal protection function responds to excessive current caused by an overloaded circuit. It helps protect conductors and connected equipment from prolonged overcurrent conditions.
Short-Circuit Protection
The magnetic protection function responds to high fault currents caused by short circuits and disconnects the circuit rapidly according to the device characteristics.
In simple terms:
RCBO = Residual Current Protection + Overload Protection + Short-Circuit Protection
RCBO vs MCB vs RCCB
RCBOs, MCBs and RCCBs serve different protection requirements.
| Protection Device | Overload Protection | Short-Circuit Protection | Residual Current Protection |
| MCB | Yes | Yes | No |
| RCCB / RCD | No | No | Yes |
| RCBO | Yes | Yes | Yes |
An MCB is mainly used for overload and short-circuit protection.
An RCCB or RCD provides residual current protection but normally requires separate overcurrent protection.
An RCBO combines these protection functions in a single device, which makes it useful when independent protection is required for individual circuits.
Why Use an RCBO for Circuit Protection?
Independent Circuit Protection
RCBOs can be installed on individual circuits in a distribution board. A fault on one protected circuit can therefore be isolated without necessarily disconnecting other separately protected circuits.
Combined Protection
An RCBO combines residual current and overcurrent protection in one device. This can simplify the protection arrangement compared with using separate devices for the same circuit.
Space-Efficient Distribution Boards
The integrated design can reduce the number of separate protective devices required in a distribution board, depending on the electrical system configuration.
Flexible Configuration
Different rated currents, pole configurations, tripping curves and residual current ratings can be selected according to circuit requirements.
Suitable for Different Electrical Systems
RCBOs can be used across residential, commercial and industrial distribution applications where the product ratings and local installation requirements are appropriate.
RCBO Applications
Residential Distribution Boards
RCBOs can be used to protect individual lighting, socket and appliance circuits in residential distribution boards.
Individual RCBO protection can help separate different circuits so that a fault on one circuit does not necessarily disconnect other protected circuits.
Commercial Buildings
RCBOs are suitable for branch circuit protection in offices, shops, hotels and other commercial buildings where residual current and overcurrent protection are required.
Industrial Electrical Systems
RCBOs can be used for selected branch circuits in industrial distribution systems when the rated voltage, current, breaking capacity and protection characteristics match the installation requirements.
Electrical Distribution Boards
RCBOs can be installed on DIN rails in compatible distribution boards and consumer units.
They can be selected for individual circuits according to the required current rating, pole configuration, tripping curve and residual current protection level.
RCBO Manufacturing and Quality Control
YRO manufactures low-voltage electrical protection products through integrated production and testing processes.
Our manufacturing capabilities include:
- Injection molding
- Automated assembly
- Precision machining
- Electrical performance testing
- Product inspection
- Finished-product quality control
We manufacture and supply electrical protection products for overseas markets and support both standard product orders and customized purchasing requirements.
Bulk RCBO Orders for Distributors and Wholesalers
YRO supplies RCBO circuit breakers for distributors, wholesalers, electrical equipment suppliers and other B2B buyers.
For bulk purchasing, buyers can provide their required:
- Rated current
- Rated voltage
- Pole configuration
- Breaking capacity
- Tripping curve
- Residual current rating
- Quantity
- Certification requirements
- Packaging requirements
We can then confirm suitable product configurations and provide the corresponding product information for evaluation.
YRO 30mA Residual Current Circuit Breaker Parameters
| Product Series | YRL7-63LE |
| Rated Current | 6-63A |
| Rated Voltage | 230V |
| Residual Operation Current | 30mA |
| Ambient Temperature | -20 ~ +70℃ |
FAQ
Q1: What does 30 mA mean on an RCBO?
30 mA is the RCBO’s residual current rating. If the residual current reaches 30 mA, the RCBO trips and disconnects the circuit.
Q2: What is the difference between Type AC and Type A RCBO?
Type AC RCBOs detect AC residual current, while Type A RCBOs detect both AC residual current and pulsating DC residual current. Type A provides a wider range of residual current protection than Type AC.
Q3: What is the difference between B curve and C curve RCBOs?
The main difference is how quickly they trip when the current suddenly increases. B-curve RCBOs trip at a lower sudden current increase, while C-curve RCBOs allow a higher short-term current increase before tripping.
Q4: Can one RCBO protect multiple circuits?
An RCBO is normally used to provide protection for a defined circuit. Where multiple circuits require independent RCBO protection, separate RCBOs can be installed for those circuits.
