Contactor
Federal Elektrik
Closing Capacity is the current value which the contactor close the contacts without any damaging. Power factorr and frequency of closing are the factors that effect to capacity of closing. According IEC 60947-4-1 standards for AC3 utilization class, if le is the maximum motor operating current closing capacity should be 10xle.
Breaking Capacity :
Breaking Capacity is the current value which contactor contacts and arc extinguisher cells are broken successfully and undamaged when the voltage value increases, breaking capacity dicreases. At IEC 60947-4-1 for AC 3 using class, If le is the motor current, breaking capacity should be 8 x le. Breaking capacity = 8 x le.
