How Do You Size a Contactor for a Motor
Type of Contactor = Ac7B. Size of Main Contactor = 100%X Full Load Current (Line). Size of Main Contactor = 100%X6 = 6 Capacity of Contactor = Value Above...
Type of Contactor = AC7b.Size of Main Contactor = 100%X Full Load Current (Line).Size of Main Contactor = 100%x6 = 6 Capacity of Contactor = Value above Chart x Full Load Current (Line).Making/Breaking Capacity of Contactor = 8×6 = 52 Amp.
How is contactor size calculated?
Making/Breaking Capacity of Contactor=1.5×13= 19 Amp. Size of Star Contactor (Starting Condition) = 33%X Full Load Current (Line). Size of Star Contactor =33%x13 = 4 Amp. Size of Main Contactor (Starting-Transition-Running) = 58%X Full Load Current (Line).
Can you oversize a contactor?
A contactor is a glorified switch and the ratings are for its own function. You want to avoid under-sizing a contactor, but you can oversize.
Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.
