Control the power ac motor with thyristor or relay?
7A is not too large a current. This current is the most economical and convenient for the relay. Of course, you can also use silicon controlled, which is a little less cost-effective. Relays will be generated by arcs, not obvious, as long as there is no problem in flammable and explosive situations.
I go to it more than one thousand watts of small motor with don't think so much speed is not necessary to use silicon controlled what contactor relays on the operation cost is too high it open just a matter of whomp up empty
No problem, the instantaneous current is considered in the design of relays. You don't have to worry about it. When selecting a type, you should think about some surplus. It is also possible to consider using a converter, which can now be replaced by a variety of functions, and has a soft start function.
Direct starting? Pay more attention on get a molded case circuit breaker with motor protection remote control words that do with contactor control circuit breaker short circuit protection Although a bit bad Make the correct choice is capacity
