Eaton Moeller  and Cutler Hammer are both well-known brands that manufacture electrical products, including circuit breakers.  However, they are not exactly the same.

Eaton Corporation, a global power management company, acquired Cutler Hammer, a leading electrical manufacturer, in 1978. Since then, Eaton has continued to produce circuit breakers under the Cutler Hammer brand name, along with its own line of Eaton-branded circuit breakers.

While Eaton and Cutler Hammer breakers share some similarities, such as their function as electrical protection devices that interrupt the flow of electricity in a circuit to prevent overloading or short circuits, there may be differences in their design, specifications, and compatibility with specific electrical systems. It's important to consult the documentation and specifications provided by the manufacturer to ensure that you are using the correct type of breaker for your specific application.

Additionally, it's worth noting that Eaton has various series of circuit breakers under both the Eaton and Cutler Hammer brands, such as the Eaton BR series, Eaton CH series, and Cutler Hammer CH series, among others, each with their own features and applications.

In summary, while Eaton and Cutler Hammer are related companies, their circuit breakers may have differences in design, specifications, and compatibility. It's crucial to refer to the manufacturer's documentation and specifications to select the appropriate breaker for your specific electrical system.