Which type of current transformer is typically used within circuit breakers?

The type of current transformer typically used within circuit breakers is the core current transformer. Core transformers are designed to provide accurate current measurement and protection in high-voltage applications, making them ideal for integration into circuit breakers.

Their design allows for the winding of current measurement coils around a magnetic core which is encased within the device. This setup enables the transformer to detect the primary current flowing through the conductor more effectively, allowing for timely operation of protection devices when an overload or fault occurs.

Additionally, the use of core current transformers in circuit breakers facilitates essential functions such as metering, fault protection, and system monitoring, which are critical for maintaining the safety and reliability of electrical distribution systems. This is why they are the preferred choice for use within circuit breakers over other types, which may not provide the same level of accuracy and functionality required for such applications.