KUHNKE Automation
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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).
•
The maximum fuse value of each channel is 12 A.
•
Use only UL Class CC fuses with a voltage of 600VAC and a break-
ing capacity of 200 kArms.
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.
Wiring diagram with additional Branch Circuit protection for CH1 and CH2
Branch Circuit Protection
Load
