SENTRON cylinder fuse insert, Class CC, 10 A, slow-acting, Un AC: 600 V. Not for use within the European Economic Area (EEA), Turkey, Switzerland. UL fuse systems Class CC and Class J. The Siemens 3NW fuse system is an essential component of the SENTRON protection devices for electrical installations, providing effective protection for people, equipment, and systems through safe disconnection in the event of overload and short circuit. Class CC fuses are used for "Branch Circuit Protection" applications. Class J fuse inserts are used for "Branch Circuit Protection" and in "Feeder Circuits." Siemens NW fuses are characterized primarily by: 1. Facilitated export due to UL and CSA certification for typical applications in the North American market. 2. Modern design with touch protection ensures safe installation. 3. Possible fuse replacement of the fuse holder in a de-energized state. Siemens offers safe, efficient solutions.