Technical information

INDUSTRIAL MACHINERY
99
3.1.3 High Fault Short Circuit Current Ratings
Although table SB 4.1 is used to determine the assumed short circuit current
rating of unmarked components, it also provides a reference for the standard fault
ratings of various products. Components with only these ratings may significantly
limit the maximum attainable panel short circuit current rating.
High fault rated components have short circuit current ratings that exceed these
values. High fault short circuit current ratings also eliminate the need to apply
current limiting provisions in the feeder circuit. Using high fault rated
components makes it simple to achieve a higher panel rating.
Rockwell Automation Component Solutions Provide The High
Fault Short Circuit Current Ratings Needed By Today’s Panel
Manufacturers
Rockwell Automation provides high fault tested UL/CSA listed combinations for
branch and feeder circuits.These high fault ratings meet and exceed the short
circuit current ratings required to cover the available fault current at panel
installations. Here are a few examples of the high fault ratings you can achieve
with Rockwell Automation power circuit components:
NEMA Bulletin 500 Line Contactors,
Overload Relays & Starters
• Circuit Breaker combinations to 100kA
480V,50kA 600V
• Fused combinations to 100kA 600V
(Type 2)
IEC Bulletin 100 Line Contactors,
Overload Relays & Starters
• Circuit Breaker combinations to 65kA 480V,
30kA 600V (Type 2)
• Fuse combinations to 100kA 600V (Type 2)
SMC™ Soft-Starters
• Fuse Combinations to 70kA
600V
PowerFlex® Drives
• Circuit Breaker combinations
to 100kA 480V
• Fused combinations to
200kA 600V
NEMA & IEC Fused
Disconnect Switches to
200kA 600V
Power Distribution
Blocks
• Fused combinations to 100kA
600V
IEC Starters and Contactors SMC™ Flex Soft
Starter
NEMA Starters and Contactors
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