Jump to content
LMPForum

Circuit Breaker Or Overload For Single Phase Motor


Recommended Posts

Dear Friends;

 

We have 220V, 1HP, 8A, 1430rpm motors for blowers. To protect the motors against overloading, we want to add safety. As normal circuit breaker do have thermal characteristics, so can we use 9/10A circuit breaker instead of overload type circuit breaker 6.5A-9.5A which usually available in 3poles? If a normal circuit breaker costs $3 then a 3pole overload type circuit breaker costs $30. So kindly guide me if we can use the circuit breaker or not if not than what is the reason.

Link to comment
Share on other sites

You can use a 10 amp breaker but , the motor is drawing 8 amps and you can only put 80% of FLC on a breaker which in this case 80% of a 10 amp breaker is 8 amps. So you will be running right at maximum allowable current for a 10 amp breaker which may cause the breaker to get a little warm depending on how long you run the motor for. If it is running continuously there is a chance of nuisance tripping because of heat but most likely it will be fine. I would use a 2 pole 15 amp as long as your wire size is correct.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...