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LRA vs FLA vs RLA

LRA, FLA, and RLA are electrical current ratings found on motor and HVAC compressor nameplates (commonly in HVAC and refrigeration systems). 

LRA (Locked Rotor Amps) is the massive startup surge when a motor is stuck or first turning on. 

FLA (Full Load Amps) is the max continuous current for general motors.

Lastly, RLA (Rated/Running Load Amps) is the operational current specifically for HVAC compressors.

RatingFull Name DefinitionCurrent LevelPrimary Use Case
LRA Locked Rotor AmpsStartup surge or current drawn when the motor shaft is completely jammed.Highest (5 to 7x normal running current)Sizing contactors, start relays, and short-circuit breakers.
FLAFull Load AmpsMaximum continuous current a general motor (like a fan) draws at full load.Medium-High (Max safe working limit)Sizing supply wires, fuses, and standard circuit breakers.
RLA Rated / Running Load AmpsExpected continuous current a compressor draws during normal, stable operation.Normal Operating (Varies based on system load)Troubleshooting system health and checking actual performance.

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