What is mean by refrigerant compressor lock rotor amperes?

Lock rotor amperes (LRA) refers to the maximum current a refrigerant compressor draws when it starts from a standstill, or "locked rotor" condition. This situation occurs when the compressor motor is unable to turn due to mechanical resistance or other issues. LRA is an important specification as it helps determine the electrical requirements for starting the compressor and ensures that the circuit can handle the surge of current without tripping or damaging components. Proper understanding of LRA is essential for selecting appropriate fuses and circuit breakers in HVAC systems.