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0814141 Application Field and Working Principle of Circuit Breakers

Circuit breakers are essential components in electrical systems and can be used to protect power systems from short-circuiting, overvoltage, and overcurrents. Moreover, their fast and efficient way of responding to any faults or short-circuits is an essential feature that makes them an integral part of safety protocol in industries and households. This article aims to discuss the application field and working principle of Circuit Breakers.

Application Field of Circuit Breakers

Circuit Breakers are extremely versatile and are deployed in different applications such as distribution panels, automation and protection switching, surge protectors, variable frequency drives, and more. Along with residential applications, they are used to protect heavy industrial equipment and other industrial systems.

Their application is further divided into two types, namely low-voltage and high-voltage circuit breakers. Low-voltage breakers are used in low-voltage residential circuits while high-voltage breakers are used in large industrial applications. For industrial applications, high-voltage circuit breakers offer better protection than low-voltage circuit breakers because they can handle higher current levels.

Moreover, these breakers can be categorized based on their operation, either as manual reset circuit breakers or as Automatic reset circuit breakers. Manual reset breakers require an operator to manually reset it after a fault or over-current is detected. Automatic reset circuit breakers will re-establish the power supply automatically after a few seconds.

Working Principle of Circuit Breakers

Despite their different applications, all circuit breakers have similar operating principle. Generally speaking, a circuit breaker works by monitoring the electrical circuit and automatically interrupting the flow of power when it detects an excess electrical current or power surge. This interruption reduces the risk of short-circuiting and protects the electrical system in the facility from an overload or surge.

The circuit breaker achieves this protection through the use of its internal components. These components work together to detect an excess current or power surge and then trip the circuit breaker. These components typically include a current transformer, temperature sensor, and overcurrent protection device. The current transformer is used to measure the current passing through a given circuit while the temperature sensor is used to detect any temperature changes in the circuit.

Finally, the overcurrent protection device is used to detect any dangerously high current and trip the circuit breaker accordingly. When any of these components detect an overcurrent or power surge, it triggers a tripping mechanism that interrupts the flow of power until the voltage or current drops below the threshold.

Conclusion

Circuit breakers are a vital component in electrical systems and are used to protect outlets, wiring, and equipment from an over-current and/or power surge. They are used in both residential and industrial applications, and have different types according to the voltage level. The working principle of circuit breakers revolves around the internal components that work together to detect an overcurrent or power surge and trip the circuit breaker accordingly. This ensures that the electrical equipment, wiring, and components are not overloaded or short-circuited.

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