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For 4 pole MCCB what is the difference between protection version ( 4P-3D ) and ( 4P-4D ) ?

For 4P 3D : 4-pole frame ( 4P ) with detection on 3 poles ( 3D )

 For 4P 4D : 4-pole frame ( 4P ) with detection on all 4 poles ( same threshold for phases and neutral )
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