CB221-25

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Circuit breakers are critical electrical components designed to protect people and electrical systems from potentially hazardous current overloads, such as those caused by faulty wiring or the accidental contact of a live wire. The CB221-25 is a highly efficient and cost effective solution for high current industrial applications. It is specifically designed to protect electrical systems against high overcurrents.

Design Principles

The CB221-25 is a three-phase miniature circuit breaker with trip free operation. It has an adjustable thermal/magnetic trip unit and is fitted with an irreversible manual reset. It has a rated current of 25A and a rated voltage of 500V AC.

The CB221-25 is designed for use in switching and protection services for industrial and commercial applications in line with industry standards. Its design is based on dual sensors, a thermal sensor and a magnetic sensor, which ensures instantaneous and reliable protection against high currents in the event of an overload.

The thermal sensor is a mechanical resetable bi-metallic element. It visualizes temperature changes in the device to provide overcurrent protection. The temperature change is caused by the current that flows through the element, thus making it an automatic trip mechanism. While the thermal sensor can detect an overcurrent of up to 250% of the nominal current, it is only able to actuate a tripping signal up to a current of 800% of the nominal current.

The magnetic sensor is a coil and an attached armature, which is normally closed. As the current increases, the magnetic force on the armature increases, forcing the armature to open and trip the circuit breaker. While the magnetic sensor is designed to detect an overcurrent up to 800% of the nominal current, it is only able to actuate a tripping signal up to a current of 5000% of the nominal current.

Operation

The CB221-25 operates when coupled with the appropriate voltage supply. After the voltage is applied, the circuit breaker will begin to regulate the current flow in the electrical system according to the settings. In the case of an overcurrent, the CB221-25 will automatically open the circuit and trip the breaker. The thermal and magnetic sensors will work simultaneously to detect any level of overcurrent and provide the appropriate response.

The CB221-25\'s unique design also allows it to be manually reset. Upon resetting, the breaker will be deactivated and it will be ready to be used again with the same pre-set settings.

Applications

The CB221-25 is designed to meet the needs of the industrial, commercial, and residential sectors. Its responsiveness and high current rating make it an ideal choice for use in high power industrial applications, such as in factories and construction sites. Its cost effectiveness and simple operation make it a great choice for residential applications, such as for the protection of individual home circuits. Its versatility and relatively small size make it ideal for use in commercial applications, such as in office buildings and shopping centers.

Conclusion

The CB221-25 is a powerful, cost effective solution for the protection of electrical systems against high overcurrents. Its dual sensors make it highly responsive to overcurrents, while its manual reset feature makes it easy to use. It is designed for use in a variety of applications in the industrial, commercial and residential sectors. With its high current rating and great cost-effectiveness, the CB221-25 is an excellent choice for the protection of electrical systems.

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