The Residual Current Operated Circuit Breaker is primarily utilized in applications that require both over-current and surface current protection (accumulation and short-circuit). They are capable of detecting flaws and trips in real time, ensuring the safety of personnel as well as equipment. This is the most functional type of circuit breaker, which further has three types of protective functions: short circuit, overload, and leakage. This device is intended to protect people against electric shock and flames, while also helping with unexpected events like earthquakes.

All types of residual protection devices including AC, A, B and APR are supported by RCBOs, which offer a variety of failure capabilities and are suitable for industrial and residential applications. Efficient RCBO systems are the ones that provide user-defined pole frequency and is suitable for single-phase or three-phase power networks with rated current up to 80 A. The normal residual current is somewhere between 10 and 500 MA. Scroll down to learn the whole working principle behind RCBOs, alongwith the different types and advantages of the circuit breaker.

Residual Current Operated Circuit Breakers Working Principle

Residual current operated circuit breakers offering overcurrent protection (RCBOs) combine residual current detection as well as overcurrent protection in one single device. This further provides a blend of electric-shock protection, line protection and fire protection in one unit. That’s why, RCBOs are installed in all circuits of modern electrical installations, to yield maximum operating safety. What’s responsible for such efficient functioning of this circuit breaker system is its working principle. Here’s how an RCBO operates.

The Kirchhoff principle states that the entering power of a signal is much the equal as the existing current. The variation of current values ​​between the indifferent wire and the live wire is compared using RCBO. The current flowing through the circuits from the live wire should be equal to the total current flowing through the neutral wire. The power of the neutral conductor decreases when a fault occurs and the difference between the two is termed as residential current. The electrical system trips the RCBO off whenever it detects residential voltage. The differential test circuit is used to check the reliability of the circuit breaker. When the user presses the test button, power flows in the test circuit because it induces an imbalance on the neutral coil, and disconnects the power supply while checking the reliability of the circuit breaker.

What are the Different Forms of RCBOs?

The working function of the RCBOs divides them into a few different types, as stated below.

S Type: It’s a harmonic home current device with a built-in timer. It can be placed upstream of an AC category RCB to ensure discrimination. Because it cannot work under the required time of 40mS, one can also use this RCD for further protection.

A Type : They are utilized for alternate sinusoidal residual current and residual pulsing DC up to 6mA.

F Type: Washing machines, washers and dryers, and conditioning systems controllers with variable speed drives are examples of frequency-controlled equipment and appliances.

Type B: Elevators, lifts, solar photovoltaics, welding rods, and transformers are examples of three- and single-phase equipment.

Advantages of RCBO

1. Provides Protection

It’s a small protection component that combines RCBO earth fault with MCB over-current protection into one package. Both neutral and line conductors would be switched by the gadget. The units have indicators to show if a trip is caused by a ground fault or an over-current.

2. Small Size

For installations in tight spaces, the RCBO breaker is indeed the best choice. Typically, switchboards feature a limited amount of space, which makes it problematic to install two individual devices for electrical protection, i.e. a residual current device and a miniature circuit breaker. What comes to the rescue is RCBOs. These circuit breakers have narrow widths, allowing multiple components to be installed in a single enclosure. They can fit within small spaces quite conveniently, further freeing up the switchboard space by replacing two different devices and making room for other installations. This also proves to be a boon when pole space becomes a problem. The considerabliy smaller widths enables the electricians to install a larger number of residual current operated circuit breakers in a single enclosure, thereby making RCBOs an ideal choice.

3. Super Quick Installation

The RCBO protects against residual current in a discriminating and dependable manner. Elimination of individual circuit breakers and separate fuses significantly reduces space requirements and installation time. RCBOs have a much higher rated switching capacity than household circuit breakers. RCBOs may usually be installed in a short amount of time. Therefore, electricians who do not wish to install both the MCB and the amplifier mostly prefer going for RCBOs.

4. Improved Isolation and Troubleshooting

In the event of an electric fault, RCBOS make sure to disconnect all poles from the power supply. Further, disconnecting all live components reliably from the supply in order to make the whole process of troubleshooting so much easier.

5. High Switching Capacity

Another great advantage of RCBOs is their switching power. The rated switching capacity of these circuit breakers is much higher as compared to traditional residual current devices that are coupled up with their MCB components. RCBOs are crafted dedicatedly with the purpose of providing short-circuit protection by doing highly efficient short-circuit clearing.

The whole idea behind efficient circuit breakers is to protect people and wiring systems from electrical accidents and consequential mishappenings. The RCBO is a hybrid of an RCB and an MCB. If you need a PLC product, Whenever you are buying a circuit breaker, it is crucial to go with a brand that offers dependability and is known for their high-quality circuit breakers to help industries and households avoid electrical mishaps.

Furthermore, prefer buying circuit breakers that are carefully designed and developed for the international market and provide optimal functionality. CHINT has customer safety on the top of the list when it comes to crafting world-class circuit breakers and each of the products are made while keeping the global safety standards in consideration. Our Residual Current Operated Circuit Breakers come in a compact size and make sure not to take up unneccesary space as well as safeguard the wiring with utmost reliability.

Nelson James
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