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How Type-B RCCB Devices Offer Safe & Efficient Protection

Shocks have become very common in their occurrence. There are Residual Current Circuit Breaker devices that companies manufacture to protect against shock. You can choose the residual current device depending on the expected waveforms.

What is RCCB Circuit Breaker?

An RCCB circuit breaker is a residual current device RCCB or an RCD based on the principle that the incoming current and the outgoing current in a circuit should be equal. It compares the values of live and neutral wires. In case there is a fault, the current that flows from the neutral wire will reduce. The difference is the residual current, and when it spots the residual current, it triggers the RCCB and, hence, trips off the circuit.

The reliability of the RCCB is ensured by the test circuit included in the residual current device. The current will start to flow through the test circuit once the test button is pushed. This will create an imbalance on the neutral wire present in the device that will make the RCCB trip, and you must disconnect the supply. Therefore, you must check the reliability of the RCCB. You can also charge these circuit breakers using the solar panel. It can also act as a Solar Inverter for PV Systems.

Benefits of RCCB:

  • It can protect the false or any leakage current.
  • It will automatically disconnect the circuit when the sensitivity limit is exceeded.
  • It provides the possibility of dual termination for both cable as well as bus bar connections.
  • It also offers protection against any fluctuation in the voltage as it has a filtering device that will help guard against the transient voltage levels.

Limitations of RCCB:

  • RCCB will not guarantee to operate if load generates the standard waveforms. It is so because I CCV is designed to operate only on the supply of standard waveforms.
  • It might be possible that there is some unwanted tripping of RCCB. It happens as there are specific changes in the electrical load.
  • RCCB will not protect against current overload. It is designed in a way to protect only the live current and the neutral current. Hence, a current overload will not be detected.
  • RCCB also does not protect against the line neutral shocks that occur. It happens because the current in them is balanced.
  • RCCV does not protect the overheating that might try conductors that are not properly screwed.

How do Type B Residual Current Devices Work?

The type B residual current device is made with two detection systems that help in detecting the fault. The first technology used is the ‘flux gate’ that helps in enabling the RCD to detect a smooth DC.

Fluxgate Principle: 

The fluxgate technology used will help simulate a searchable core through high-frequency wave voltage. This will allow DC detection. Hence, this principle is often used in type B RCD.

Applications for Type B Residual Current Devices:

  • They are ideal for use with EV chargers as the manufacturers have already given the disclaimer that DC leakage might occur while charging. Though a detection device is present in the charger to provide protection, a type B residual current device will provide better assurance of the continuity of the service and better security. The type of residual current device will also be able to detect the earth leakage current.
  • You can also use the three-phase photovoltaic systems to protect against electrocution due to the AC/ DC converters.
  • Three-phase drives can lead to Earth leakage current at different frequencies. This leads to applications like a crane powered from a mobile or an elevator. Hence, you need a type of BRCD for protection and select the current trip rating based on the specific application.

RCDs at Different Levels of a Circuit:

You can also do it through time delay. This will help avoid tripping any residual current device other than the device that is immediately at the fault position. To enable time delayed operation, a specific ICD has to be selected to withstand the residual current at a specified time without any tripping.

By selecting different shipping times, you can achieve differentiation between RCDs. When it comes to sensitivity to DC, choosing the RCD with higher tripping levels for different circuit levels will help avoid any effects by the DC. An RCD at a comparatively lower level of a circuit will trip sooner. This will help in isolating the fault and will enable the continuity of the remaining circuit.


The GYL9 Type B RCCB for photovoltaic systems is suitable for a voltage rated at 230 V at two poles, 400V when it has 4 poles, and an ampere rate set to 63. It will protect the safety of the electrical equipment and the human body when an electric shock or a leakage occurs. The same method will be used for infrequent circuit switching as well as infrequent motor starting.

RCCB is a fundamental reason behind the safety of all charging points, and type B RCCB is the secret to it. It has many security gadgets that will deal with the expected flow that might result in an electric shock. It is the best protective measure that helps in safeguarding the automatic disconnection of the power supply.


There are multiple reasons to use a type B residual of the current circuit breaker. Based on the installation location and the surrounding conditions, the residual current circuit breaker will require test voltage and will also alert us in real-time. It is also easy to install and has quick on and off features. It protects us against indirect contraction as well. The features available are portable. They are small in size and require significantly less workspace. Geya will ensure the most suitable and safest device.

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I am William, Electrical Engineering Author. Dedicated to writing technical articles on Timer Relay, Monitoring Relay, Surge Protection Device and other electrical devices. With 7 years of writing experience, I am committed to providing accurate and in-depth expertise to my readers.

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