Motor circuit breaker - connections

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