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Principle of operation of RCBO

Author: Site Editor     Publish Time: 2024-03-25      Origin: Site

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RCBO (Residual Current Circuit Breaker with Overcurrent protection) is a kind of comprehensive circuit breaker which can provide overcurrent protection and residual current protection. It is an important safety device in the field of household and industrial electricity, which can automatically cut off the circuit in case of current overload or ground fault to protect personal safety and electrical equipment.


The working principle of RCBO can be divided into three aspects: overcurrent protection, residual current protection and circuit cut-off.



First, RCBOs provide overcurrent protection. 


When the current in the circuit exceeds the rated value, the RCBO will automatically cut off the circuit to prevent wires from overheating, catching fire or damaging electrical equipment. Overcurrent protection is one of the main functions of the RCBO, which detects if the current exceeds the set limit and quickly cuts off the circuit when the value is exceeded.


Secondly, RCBO can also provide residual current protection. 


Residual current is current that flows outside the normal path in a circuit, usually due to leakage in electrical equipment. Residual currents can cause electrocution when the current passes through the human body or through an earth fault path. the RCBO detects residual currents by monitoring the difference between the currents entering and leaving the circuit. If the difference exceeds a set min value (usually 30mA), it is considered that there is a leakage of current and the RCBO will immediately cut off the circuit to avoid electric shock.


Finally, the RCBO can cut off the circuit. 


When the RCBO detects that the overcurrent or residual current exceeds the set min value, it will quickly cut off the circuit to ensure personal safety and protection of electrical equipment. Cutting off the circuit is very fast, usually within a few milliseconds, thus reducing any potential danger.


The working principle of the RCBO relies heavily on its internal circuitry and sensing devices. 

Among other things, overcurrent protection is achieved by a sensing circuit that monitors whether the current exceeds the rated value. If the current exceeds the rated value, the sensing circuit triggers a mechanism that cuts off the circuit. Residual current protection, on the other hand, is realized through a differential sensor installed inside the RCBO. The sensor detects the difference between the current entering and leaving the circuit and cuts off the circuit if the sniff value is exceeded.


To summarize, the RCBO is a comprehensive circuit breaker designed to protect personal safety and the safety of electrical equipment. Its operating principle combines overcurrent protection and residual current protection, and is able to automatically cut off the circuit when the current is overloaded or the residual current is exceeded to avoid electric shock accidents and damage to equipment.The operating principle of the RCBO relies on its internal circuitry and sensing device, which triggers a mechanism that cuts off the circuit by detecting the magnitude of the current and the difference between the current and the difference between the current and the difference between the current and the difference between the current and the difference. This safety device has an important role to play in the domestic and industrial electricity sector and plays an integral part in providing electrical safety.


Translated with DeepL.com (free version)


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