All values refer to current, but what is their meaning? What are they used for?
This one is self-explanatory, it refers to the amps drawn by the motor when it is operating at full load. This would be the current value to consider when estimating voltage drop across the feeder circuit.
This current value is the one that would result if rated voltage was applied to the motor while its rotor is locked in place (not turning). This will normally not occur in field applications, but consider that the rotor is at 0 rpm when a motor is turned off.... therefore the LRA provides an indication of the inrush current during startup.
The LRA value is irrelevant when the motor is running, but it must be taken into account when sizing overload protection equipment.
Minimum Circuit Ampacity
Another self-explanatory concept - MCA is the minimum capacity that is allowed for the feeder circuit that will power the motor. For instance, a motor with an MCA of 20 amps will require AWG#12 cable.
Maximum Over-current Protection Device
This is the max rated value the breaker can have. If sized above this value, it might not trip during some overload conditions.
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#usr51896 Leviton MS302-DS Manual Motor Switch, 30A, 600VAC, Toggle Style, 2P, Black
#usr48742 Leviton MS303-DS Manual Motor Switch 30A 600VAC, Standard Toggle, 3P Black
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