Power Break* I Insulated Case - Previous Generation Circuit Breakers are ABB’s legacy insulated case circuit breakers used in industrial and commercial power distribution systems. These breakers are no longer actively manufactured, but spare parts and support remain available. Archived documentation and manuals are located in the "Publications" section on the right side of the webpage. Power Break* I breakers are known for their high reliability and robustness, making them suitable for use in existing systems.