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How can I choose proper contactor rating for UPS bypass chnageover switch with 2no 2nc contactor ?
It is 1 phase UPS only about 3-5 kva per unit, its line interactive and online UPS (a lots of UPS, one contactor individually for each UPS), and UPS load is mostly resistive (computer and equipments, non inductive)
Can I use AC1 rated contactor or I needs AC3 rated contac
It is AC1 20a, but AC3 9a will be enough and reliable for 3kva UPS ? Or it is better to use AC1 40a AC3 25a rated contactor ?
It is 1 phase UPS only about 3-5 kva per unit, its line interactive and online UPS (a lots of UPS, one contactor individually for each UPS), and UPS load is mostly resistive (computer and equipments, non inductive)
Can I use AC1 rated contactor or I needs AC3 rated contac
It is AC1 20a, but AC3 9a will be enough and reliable for 3kva UPS ? Or it is better to use AC1 40a AC3 25a rated contactor ?
