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LRA stands for Lock Rotor Ampere on compressor and means that it is a high inrush current during starting period of the compressor.

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What does LRA stand for in electrical terms?

LRA stands for locked rotor amps. It is the very high current drawn by a motor at the instant it receives power, but before the motor has started to turn. Typical LRA values can be anywhere between 3 and 8 times the full-load running current.


What is LRA of a motor?

Locked rotor ampere


What is the ratio between locked rotor current and full load current?

Each motor has a published manufacturer Lock Rotor Amperage (LRA) rating that is used to obtain this ratio. If a manufacturer otained a reading of 100A while bench testing their motor (equipment) at full load, if the motor FLA (Full Load Anps) is 50 amps, the raito LRA to FLA is 2 to 1 or 200%.


What tool can protect compressors from the effect of esd?

To protect compressors from the effects of electrostatic discharge (ESD), an effective tool is an ESD grounding or grounding strap system. This system ensures that any accumulated static electricity is safely diverted to the ground, minimizing the risk of discharge that could damage sensitive components. Additionally, using ESD-safe materials and equipment can further enhance protection against ESD-related issues. Implementing proper ESD control protocols and regular maintenance can also help safeguard compressors.


LRA is 134 AMPS. what size breaker should be used?

LRA (locked rotor amps) is not used to calculate the breaker size. Breaker's are used to protect the size of the conductor that is connected to it. Motor calculations are based on the motor's FLA (full load amps).Conductor size is 125% of the motor's FLA.Breaker size is 250% of the motor's FLA.This is the only occasion when the breaker is sized larger that the conductors maximum amperage rating. This is due to the motor drawing up to 300 to 600% of its FLA when starting.If you state the motor's wattage, voltage or amperage this calculation can be calculated here.