28 Rockwell Automation Publication 750-RM003A-EN-P - April 2018
Chapter 1 Selection Considerations
External Circuit Protection Device Compatibility Check Example
Figure 3 and Figure 4 show the external circuit protection fuses that are
required for a PowerFlex 700AFE frame 10, IP21 Rittal, 480V AC, and the
equivalent PowerFlex 755TM bus supply frame 8, normal duty, 480V AC, 519
A DC, catalog current code ‘D505’.
According to the tables, the PowerFlex 700AFE should have had either 800 A
time delay or 1000 A non-time delay branch circuit fuses installed external to
the PowerFlex 700AFE enclosure.
The PowerFlex 755TM bus supply has integral 900 A high-speed
semiconductor fuses and may not require external branch circuit protection
devices. If external branch circuit fuses are required, the recommended fuse
rating per the table should be 650…800 A time delay or 650…1500 A non-time
delay fuses.
The existing external branch circuit protection fuses can be reused.
Figure 3 - PowerFlex 700AFE, IP21 Rittal Frame 10, Required External AC Input Fuses
Figure 4 - PowerFlex 755TM Bus Supply, Frame 8, 519A DC, Normal Duty, Catalog Code D505
IMPORTANT Figure 3 and Figure 4 are for illustrative purposes only. Do not use these for
fuse selection.
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