What encloses the various parts of the most popular type of circuit breakers?

The molded-case frame is critical as it serves as the housing for the various components of a molded-case circuit breaker. This frame is designed to provide structural support and insulation to the internal parts, which include contacts, springs, and terminals. The molded-case frame also plays a significant role in protecting these components from environmental factors, ensuring safe operation and longevity.

The frame facilitates safe operation by containing potential arc flashes and providing physical barriers to prevent accidental contact with the energized parts. Additionally, it allows for the assembly and integration of all internal components, ensuring that they function effectively together. Understanding the role of the molded-case frame is crucial for recognizing how circuit breakers operate within electrical systems and the importance of safety in their design.