The Role Of Setting Current In The Protection Of Low Voltage Column Circuit Breakers

Sensitivity check: K1=K1xI/Idz2
Where: I—minimum short-circuit current on motor terminals (A), (the minimum short-circuit current at motor terminals is generally not calculated in design)
K1x—relative sensitivity coefficient when two-phase short circuit occurs, which is 0.87
Idz—Lv Pole Mounted Circuit Breakers instantaneous (short-delay) trip setting current