Which two types of circuit breakers are commonly used in distribution equipment?

Air circuit breakers and miniature circuit breakers are indeed commonly used in distribution equipment.

Air circuit breakers are designed to interrupt large currents and are typically used in industrial settings. They operate by creating an arc in the air when the circuit is interrupted, allowing them to handle high voltage and current levels effectively. Their design allows for easy maintenance and replacement while also providing reliable protection against overloads and short circuits.

Miniature circuit breakers, on the other hand, are used for protecting smaller circuits and are widely found in residential and commercial settings. These breakers offer overcurrent protection and help prevent potential hazards by automatically switching off an electrical circuit when a fault occurs.

Both types are essential because they cater to different load requirements—air circuit breakers for larger, industrial applications and miniature circuit breakers for smaller, everyday electrical systems—making them integral components in distribution equipment.