Rockwell Automation Publication 193-UM015E-EN-P - October 2015 25
Product Overview Chapter 1
Modules, and one Operator Station). You can use either Expansion Bus Power
Supply with any combination of Digital and Analog Expansion Modules.
Protection Features
Standard Current-based Protection
All versions of the E300 relay provide the following motor protection functions:
• Thermal Overload (51)
• Phase Loss
• Current Imbalance (46)
• Undercurrent – load loss (37)
• Overcurrent – load jam (48)
• Overcurrent – load stall
• Start Inhibit (66)
Ground Fault Current-based Protection
The E300 relay sensing modules and control modules with a ground fault current
option provides the following motor protection function:
• Ground Fault – zero sequence method (50N)
Voltage- and Power-based Protection
The E300 relay sensing modules with voltage sensing provides the following
motor protection functions:
• U
ndervoltage (27)
• Overvoltage (59)
• Phase Reversal (47) – voltage-based
• Over and Under Frequency (81) – voltage-based
• Voltage Imbalance (46)
• Over and Under Power (37)
• Over and Under Leading/Lagging Power Factor (55)
• Over and Under Reactive Power Generated
• Over and Under Reactive Power Consumed
• Over and Under Apparent Power
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