Motor Overload Protection; Short Circuit Current Rating; Short Circuit Current Ratings - Floor Mount Drives; With Cabinet Options - Allen-Bradley 20F Installation Instructions Manual

Chapter 4 Power Wiring

Motor Overload Protection

Short Circuit Current Rating

Short Circuit Current Ratings
– Floor Mount Drives with
Cabinet Options
Table 27 - Short Circuit Current Ratings – 400V AC Input
Drive Catalog Duty kW
Number Cycle
21G...C460 LD 315
ND 250
HD 200
21G...C540 LD 315
ND 315
HD 250
21G...C567 LD 355
ND 315
HD 250
21G...C650 LD 400
ND 355
HD 315
192
Class 10 motor overload protection according to NEC article 430 and motor
over-temperature protection according to NEC article 430.126 (A)(2). UL
508C File E59272.
The maximum short circuit rating is 200,000 A RMS symmetrical (only 20F
and 20G drives).
The actual short circuit rating is determined by the AIC rating of the installed
fuse or circuit breaker. See
Default ratings (no added protection) shown. A"•" indicates ratings that can
be achieved with additional protection.
Short Circuit Current Rating (kA)
Circuit Breaker Circuit Breaker with Input Contactor
(1) (1)
Only (P3) (P3 with P11)
100 30
100 30 or
• 65 w/600 A Class J fuse
100 5 or
• 100 w/500...600 A Class J fuse
• 18 w/600...800 A Class L fuse
• 18 w/500 A CB
100 30
100 30
100 30 or
• 65 w/600 A Class J fuse
100 30
100 30
100 30 or
• 65 w/600 A Class J fuse
100 42
100 42
100 30
Rockwell Automation Publication 750-IN001P-EN-P - April 2017
page 192 for 21G drives.
Molded Case Switch Only Molded Case Switch with Input Contactor
(2)
(P5) (P5 with P11)
65 or 5 or
• 100 w/700...800 A Class L fuse • 30 w/700...1200 A Class L fuse
• 30 w/700...1200 A CB
65 5 or
• 65 w/600 A Class J fuse
• 30 w/600...1000 A Class L fuse
• 30 w/600...1200 A CB
65 5 or
• 100 w/500...600 A Class J fuse
• 18 w/600...800 A Class L fuse
• 18 w/500 A CB
65 or 5 or
• 100 w/750...800 A Class L fuse • 30 w/750...1300 A Class L fuse
• 30 w/800...1200 A CB
65 or 5 or
• 100 w/700...800 A Class L fuse • 30 w/700...1200 A Class L fuse
• 30 w/700...1200 A CB
65 5 or
• 65 w/600 A Class J fuse
• 30 w/600...1000 A Class L fuse
• 30 w/600...1200 A CB
65 or 5 or
• 100 w/800 A Class L fuse • 30 w/800...1300 A Class L fuse
• 30 w/800...1200 A CB
65 or 5 or
• 100 w/750...800 A Class L fuse • 30 w/750...1200 A Class L fuse
• 30 w/800...1200 A CB
65 5 or
• 65 w/600 A Class J fuse
• 30 w/600...1000 A Class L fuse
• 30 w/600...1200 A CB
65 or 5 or
• 100 w/1000...1200 A Class L fuse • 42 w/1000...1600 A Class L fuse
• 42 w/1000...1200 A CB
65 or 5 or
• 100 w/850...1200 A Class L fuse • 42 w/850...1400 A Class L fuse
• 42w/900...1200 A CB
65 or 5 or
• 100 w/700...800 A Class L fuse • 30 w/700...1200 A Class L fuse
• 30 w/700...1200 A CB
(2)