ACB tripping settings Acb has 6 adjustable tripping settings 1 Long time delay (Tr ) 2 Short time delay( Tsd ) 3 Earth fault delay (Tg) 4 Long time (Ir) 5 Short time (Isd) 6 Earth Fault (Ig) Long time is for maximum overload capacity . Short time is for short circuit current Earth fault is for earth fault current . As per thumb Rule : 1. Long time set at 0.8 means 80% of full load current .Until this level of current breaker carry without tripping . Above 0.8 Acb trips. Long time delay causes the breaker to wait for certain time to allow heavy temporary inrush currents to pass away. Generally long time delay is set at 4 Sec. 2. Short time set at 0.6 means 60% of full load current . It determines the Amount of Current the Breaker will carry for short time period. Generally short time delay set at 0.2 sec. 3. Earth Fault set at 0.3 or 30% of fault current . It controls the amount of Ground Fault current that will caus...
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