N60/N30/N20/N10/M30 CT selection and Load MAX current formula

[admin]

   
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.