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Both of the utilisation categories AC14 and AC15 are used for the switching of electromagnetic loads whose power drawn with the electromagnet closed are:
1- less than 72 VA ---- This is AC14
2- More than 72 VA ---- this is AC15
Example for both categories is switiching the operating coil of contactor
1- less than 72 VA ---- This is AC14
2- More than 72 VA ---- this is AC15
Example for both categories is switiching the operating coil of contactor