Class CC fuses are used for \"branch circuit protection\". The characteristic of the fuse links is designed and tested to comply with the US National electrical Code NEC 210.20(A). This means that when subject to continuous operation, only 80% of the rated current is permissible as operational current. An operational current of 100% of the rated current 30 A is only permissible short time. The devices are prepared for the inscription labels of the ALPHA FIX terminal blocks 8WH8120-7AA15 and 8WH8120-7XA05. Siemens Sentron™ Cylindrical Fuse Link, Slow, 4 A, 600 VAC, 200 kA Interrupt, Class: CC, Ceramic/Plastic, 10.3 mm Dia x 38.1 mm L Body Size