Motor circuit breaker - connections

In summary, a motor circuit breaker is an electrical device that protects electric motors from overloads and other types of faults. It uses an electromechanical mechanism to detect abnormal current levels and interrupt the flow of electricity. There are different types of connections available for motor circuit breakers, including direct, thermal-magnetic, and electronic connections, and the most appropriate type depends on the specific requirements of the motor and electrical system. It is recommended to have a licensed electrician install a motor circuit breaker, but it is possible to install it yourself if you have the necessary knowledge and experience.
  • #1
Ivan001
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Why we use such connection between 4 and 5 terminals? Why the transformer isn't connected via 2 and 4 terminals from CB, the voltage will still be 380V because it's between two phases? In such situation the terminals 5 and 6 will stay unused, why not on this way?
 

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  • #2
Most 3-phase overload relays requires current on all 3 legs. This wiring method provides that.
 
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