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+--- Thread: N60/N30/N20/N10/M30 CT selection and Load MAX current formula (/showthread.php?tid=8604)
N60/N30/N20/N10/M30 CT selection and Load MAX current formula - admin - 09-03-2025
every CT clamp input channel will have two resistance. for example, CT2 channel are R23, R24
use the formula let input voltage <700mV
if your CT clamp sensor is 2000:1
Load current=30A,
input voltage = 5.1R*2*30A/2000=153mA (VIPN)
so if input voltage <700mA , use 5.1R resistance on PCB, 2000:1 MAX can detect 137A AC220V load.
if you want support more large current, you can change the resistance or change CT 2000:1 with other models. Just use by the formula.