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RCCB Vs. RCCB: What is Different?

Resource: https://www.youtube.com/watch?v=ns64-BwtyG8

The difference between RCCB vs. RCBO includes variations in their construction, application, and ability to protect against shocks or electrical overloads, among others. In light of that, this comparison guide will discuss the difference between RCCB and RCBO, when to use each, and any other factors that might affect your decision when making a choice.

RCCB Meaning

Let’s begin with the RCCB meaning. This will include its brief definition as well as what these letters —RCCB — stand for, so you can have a better understanding of this type of product.

What is RCCB?

In short, an RCCB is a type of device that’s meant to protect against electrocution or shocks, usually by automatically disconnecting the circuit when it detects a leakage current: a current leakage may result from damage to the insulation or a person coming into contact with a faulty electrical appliance or wiring.

RCCB Full Form

RCCB, in full, is a residual current circuit breaker. A circuit breaker is a device that breaks the electrical connection between two or more conductive items when a fault in the system occurs. When used to protect against shocks, the RCCB will be triggered by a leakage current.

RCBO Meaning

Now a brief look at the RCBO meaning. Again, we’ll discuss what the letters stand for and the RCBO as function or purpose in an electrical system. So, what’s an RCBO, and what do the letters stand for?

What is RCBO?

An RCBO is similar to an RCCB — a residual current-operated circuit breaker that prevents shocks. However, in addition to shock protection, RCBOs also provide overload protection. That means it trips a circuit in the event that there’s too much current or voltage.

RCBO Full Form

RCBO is the shortened form of a residual current-operated circuit breaker with overload protection. As you can see, the main difference between RCCB and RCBO breakers is the added protection feature that prevents the effects of system overloads: more about this is below.

RCCB wiring
RCCB wiring
Resource: https://www.youtube.com/watch?v=OGtD0Qvc97w


Here, now, is the comparison of RCCB vs. RCBO breakers. This will be a look into the RCCB RCBO difference in terms of construction, working principle, function, rating, and other comparison points such as size and price.

RCBO Vs. RCCB: Construction

In terms of construction, the RCBB RCBO difference is seen in the type of trip components. In an RCCB, a current transformer (CT) is used to detect the fault current, while an RCBO contains both a CT and a thermal/magnetic tripping component.

But while the RCCB and RCBO both contain core balancing CTs, the tripping components of an RCBO offer a higher current rating than that of an RCCB, as we’ll see later.

RCBO Vs. RCCB: Working

The RCCB working principle is based on the fact that the current in an electrical system is usually balanced. That means the current flowing through the live wire will match the amount coming back through the neutral wire. The RCCB monitors these currents and trips if they do not balance.

On the other hand, in addition to the shock protection components, an RCBO has built-in overload protection that trips when too much current is running through the system. This is usually a thermal/magnetic mechanism.

RCBO Vs. RCCB: Function

One of the main differences between RCCB and RCBO breakers is their purpose in an electrical system. The only RCCB function is to protect against electric shocks that leakage current may cause and cannot be relied upon to protect against an electrical overload.

In contrast, you can use RCBOs for both protection against shocks and overloading. That means the RCBO is a much more versatile device and can be used in more scenarios. It’s also important to note the RCBO will not suit high-voltage or high-current systems.

RCBO Vs. RCCB: Rating

The RCBO or RCCB rating will depend on the system that it’s meant for. However, because RCBOs are designed to offer protection against overcurrents or short-circuit, they have higher breaking capacities than RCCBs, of up to 10,000A.

When it comes to sensitivity, though, the RCCB rating is broader and higher than that of the RCBO, as it can detect both small and very high leakage currents. Typical RCCBs can detect up to 1000 mA leakage current, but RCBOs typically detect up to only 300 mA.


In terms of dimensions, the RCCB breaker is generally larger. RCBOs are relatively smaller in size and occupy less space, which can be convenient when installing multiple devices on one circuit.

The bigger size of an RCCB has one main disadvantage: You would need more space to install them, and this can be a constraint if you have limited space. These breakers also require pairing with an MCB or MCCB, depending on the system, and that can add to the bulk of the breaker installation.

RCBO Vs. RCCB: Price

The cost of RCCB and RCBO breakers will depend on various factors, such as size, type, and rating. But in general, expect to pay more for an RCBO as they offer more protection against overloading and short-circuiting, about two times more.

Even when combined with a normal circuit breaker for overcurrent protection, the cost of an RCBO will remain higher than that of an RCCB. In addition to the RCCB cost, its lifespan is also longer, given that it’s not exposed to or meant to respond to arc fault and overvoltage.

Resource: https://www.youtube.com/watch?v=UykIu8YS0Zw


When choosing between an RCCB and RCBO, you should always pay attention to the type of system you are working with and its requirements for protection.

Because the RCBO is more versatile and can protect against electric shock and overloads, it may be worth the extra cost in certain applications. However, if your system only requires basic protection against shocks, then an RCCB may suffice.

Remember, also, to consult a certified electrician or engineer before making any major decisions regarding your electrical system. Taking the time upfront to make sure you have the right product can save you time and money in the long run!​


The comparison between RCCB vs. RCBO shows that the latter is a more versatile and reliable device for protecting against electric shocks and fires in electrical systems. You cannot rely on an RCCB to protect against overloads, whereas the RCBO has built-in protection that can trip when too much current is running through a system.

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