Differences between an RCD and RCBO

Article Written By: Glenn J Tucker

RCDs (Residual current device) and RCBOs (Residual current circuit breaker with overcurrent) play an extremely important role within circuits worldwide.

Many people may be aware of what RCDs and RCBOs are, they might not have any knowledge of the important function that they have within a circuit. Created with the purpose of protecting people from receiving an electric shock from a faulty system, an RCD will act to cut off power whenever a fault is detected. This will prevent wiring from becoming damaged, as well as household appliances and the system itself.

RCD - Originally introduced into home circuits back in the eighties, for a long time, RCD's were known as Earth Leakage Circuit Breakers.

By using a differential current transformer, RCDs measure the balance of a current between two conductors. This process will see that the difference in current levels flowing out of the live conductor and the current that returns via a neutral conductor.

If the measurement for both does not return as zero, then the RCD will know that there is a current leakage and as a result will begin to act.

While the RCD will detect an over-current, it doesn't provide any type of protection against potential overloads or short-circuiting.

The RCBO (residual current circuit breaker with over-current) was created to serve two main purposes, to protect life and to protect a circuit from overloading.

Typically an RCBO will be installed by an electrician in a circuit where required, in order to prevent a circuit from overloading, as well as to prevent potentially life-threatening electric shocks from occurring.

Normally featuring two circuits, an RCBO has the ability to detect any imbalances and overloads within a circuit, whilst also possessing the ability to use an interrupt method.

The RCBO will work to measure the current within a circuit on both the neutral and live conductors - operating similarly to an RCD. If the two measurements aren't equal, the RCBO will perform to break the circuit.

Possessing a certain amount of versatility, an RCBO also has the ability to work similarly as an MCB - a mains circuit breaker. They are typically rated by the standard current that they would normally carry, as well as by the maximum level of a short-circuit current that the RCBO can interrupt - in a safe manner.

In short, as well as performing the all the tasks that would be completed by an RCD (residual current device); an RCBO will also carry out the role of an MCB (mains circuit breaker).

When considering installing either an RCD or RCBO, it is important to be aware of the dangers and to remember that you are solely responsible for the consequences.

Installing either an RCD or RCBO may seem extremely simple with a how to guide - however, it just isn't. Without sound background knowledge you could be putting yourself, but also others at great risk therefore it is probably best to seek the services of a professional electrician instead.

About the Author

Glenn Tucker - Emergency lighting and Crompton lighting

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