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What is the criteria for the selection of closed toroids or rectangular sensors ?

To differential between the selection of closed toroids or rectangular sensor, the below should be taken into consideration : 
1-Shape of the sensor (closed toroids A-type, split toroids OA- type and rectangular sensor)
2- Rated operational current (Ie) A

Cosed toroid is used for rated operational current up to 630 A , and rectangular sensor is used for rated operational current from 1600 to 3200 A

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