What is the frame size of a 30A circuit breaker?

The frame size of a 30A circuit breaker typically refers to the maximum current that the breaker is designed to handle, with standard frame sizes for circuit breakers often being categorized by specific ratings. In this context, a 30A circuit breaker is generally built to protect a circuit rated for 30 amps, which is commonly found in residential and commercial electrical systems for various applications including lighting, outlets, and equipment.

When considering the other options, it's important to recognize that they represent different amperage ratings that exceed the 30A requirement, meaning they are unsuitable as frame sizes for a breaker rated specifically at 30A. Each of these represents a higher capacity than necessary, making them inappropriate for the defined task of protecting a 30-amp circuit.

In practical applications, selecting a circuit breaker with a frame size corresponding to the circuit's intended load is crucial for safety, preventing overloads, and ensuring compliance with electrical standards. Therefore, understanding this relationship aids in proper electrical design and protection.