KUHNKE Automation 6.5 Output 6.5.1 Branch Circuit protection according UL 508A UL 508A specifies how output wires for use are to be protected. Compliance with the following points is mandatory. • Every PHC output wire shall be protected (UL 508 31.2.1) because it is energized towards the ground potential. • Fuses shall be easily accessible and replaceable at no risk for the operator (UL 31.2.3). • Use only UL Class CC fuses with a voltage of 600VAC and a break- ing capacity of 200 kArms. • The maximum fuse value of each channel is 12 A. 6.5.2 Lead fuses The standard demands the use of Class CC fuses at a rated voltage of 600 VAC and a rated interruption capacity of 200 kA rms .
Fuses shall be UL listed. Example fuse: KLKR015 Class CC Fuse. Branch Circuit Protection Load Wiring diagram with additional Branch Circuit protection for CH1 and CH2 E 774 GB 29 30.06.2014