Motor Locked-Rotor Ampere Sizing at App Store analyse

App power index: 200 (based on ranks around App Stores today)
Reference Education
Developer: Yuhsiu Lai
Price: 0 free
Current version: 7, last update: 7 years ago
First release : 03 Sep 2012
App size: 606 Kb
4.4 ( 544 ratings )
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Estimation application downloads and cost

> 4.4k
Monthly downloads
~ $ 1.8k
Estimation App Cost


This tool calculates the maximum motor locked-rotor current, which is also known as LRA, in amperes for single and poly-phase Design B, C and D motors as per Table 430.251(A) and 430.251(B) of NEC (2011).

The LRA is the amount of current drawn by motor loads when the motors start (during startup motor is not turning).

The LRA is much larger than the full load ampere or FLA (the current drawn when motor is turning).

The rating calculated with this tool can be used in selection of disconnecting means and controllers for motors as determined from HP and voltage rating and design letter.

This app is tested with all iOS platforms including iPhone and iPad.
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# Term Store county Place Priority
1 windin 20 ⭐️⭐️⭐️⭐️
Available in countries
Country Price
Canada 1.39 CAD
China 6 CNY
France 1.09 EUR
Germany 1.09 EUR
Italy 1.09 EUR
Netherlands 1.09 EUR
Portugal 1.09 EUR
Spain 1.09 EUR
Poland 1.09 EUR
UK 0.99 GBP
India 79 INR
Japan 120 JPY
Poland 4.99 PLN
Russia 75 RUB
Turkey 4.49 TRY
USA 0.99 USD
Korea, Republic Of 1.09 USD
Ukraine 0.99 USD
Available for devices
iPhone3GS, iPadWifi, iPad3G, iPhone4, iPodTouchThirdGen, iPodTouchFourthGen, iPad2Wifi, iPad23G, iPhone4S, iPadThirdGen, iPadThirdGen4G, iPhone5, iPodTouchFifthGen, iPadFourthGen, iPadFourthGen4G, iPadMini, iPadMini4G, iPhone5c, iPhone5s, iPadAir, iPadAirCellular, iPadMiniRetina, iPadMiniRetinaCellular, iPhone6, iPhone6Plus, iPadAir2, iPadAir2Cellular, iPadMini3, iPadMini3Cellular, iPodTouchSixthGen, iPhone6s, iPhone6sPlus, iPadMini4, iPadMini4Cellular, iPadPro, iPadProCellular, iPadPro97, iPadPro97Cellular, iPhoneSE, iPhone7, iPhone7Plus, iPad611, iPad612, iPad71, iPad72, iPad73, iPad74, iPhone8, iPhone8Plus, iPhoneX,