The BK/1A5603-10-R is an Eaton Series B series, three-phase molded case circuit breaker. It is a "Catalog Breaker System" with bolt-on mounting. It is rated at 10kA and operates at 600VAC. It has an instantaneous range of 3 to 10 A, and a long time range of 0.1 to 10 A. This breaker is used in applications such as residential, commercial, and industrial installations. It features a modular design, with interchangeable trip units that enable a wide range of ampere ranges and trip characteristics. The Eaton BK/1A5603-10-R circuit breaker also features a visible, manual operating release.