TOSUNlux Residual Current Operated Circuit Breaker

In most cases, the MCB or RCBO you choose should be rated for the current they handle. You should also check their trip characteristics and look for extra features and safety approvals. Your electrical installation is unique, so the right MCB or RCBO is crucial. Consider these factors when selecting MCB or RCBO.

• Overcurrent Characteristics

The overcurrent characteristics of Type B, C or D MCB or RCBO are determined by the trip times of the devices. In real-world situations, it is important to ensure that the breakers trip within a reasonable time. For example, an MCB can trip in forty seconds at two times its rated current. It will allow for this brief surge to occur and prevent damage to the device.

An RCBO is a resizable circuit breaker. It can be used to protect a lighting circuit and provides protection from electric shocks. Its main purpose is to interrupt the flow of power to a water heater. An MCB or RCBO is a device that monitors the flow of current in a line and interrupts the circuit during a short circuit, overload, or earth leakage. These devices are also used in distribution boards to protect from overcurrent.

An RCBO or MCB can protect against electric shock or fire by detecting overcurrent. MCBs are a safer alternative to RCCBs and can be used in homes. They provide circuit isolation but are less durable than RCBs. RCBOs are generally designed to interrupt power for a short period of time and are often safer to use. 

• Basic Applications

A manual circuit breaker (MCB) is an electrical device that trips in an overload or short circuit situation. It causes an interruption of the load circuit when it trips. The operating knob moved to the off position when the MCB tripped. There are several types of MCBs, with short circuit breaking capacities. You need to consider the basic applications of Type B, C or D devices. Type B devices are well-suited for domestic use, providing reliable protection in residential settings. Type C devices, on the other hand, are ideal for commercial and industrial applications, delivering robust performance in demanding environments. Finally, Type D devices are specifically designed for industries with high inrush currents, ensuring effective protection in such scenarios. By considering these distinctions, you can make an informed decision and choose the appropriate device based on your specific application requirements.

• Tripping Characteristics of MCB

Different MCBs and RCBOs offer various trip characteristics, such as B, C, or D curves. Consider the type of load and its starting current to select the appropriate trip curve for optimal protection and sensitivity. Tripping characteristics of MCBs are illustrated graphically in a trip curve chart. The thermal region represents the bi-metal tripping unit, and it gradually slopes downwards as a result of a gradual overload. The B-type MCB has a tripping range of 3 to 5 times the rated current. A D curve tripping characteristic is four seconds slower than a K curve. This gives the circuit more time to ride through high in-rush at start-up. The C-type tripping time is approximately 5 to 10 times. The D curve has a tripping range of 10 to 20 times the rated current.

• Unwanted Tripping

The most important thing to know when selecting an MCB or RCBO is how to troubleshoot it. You can also check the safety rating of the device before you purchase it to avoid unwanted tripping.

Both types of MCBs and RCBOs can trip a circuit when an overcurrent occurs. However, an RCBO may not trip an overcurrent if it detects a low voltage or an overcurrent condition. An MCB that protects against both types of overloads and short circuits i