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MOV in 3-phase supply

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saurav_sdpl

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I have some doubt regarding placement of MOV in 3-phase circuit, genera;lly MOV is placed between line and neutral for each phase, but in some circuit i have seen that MOV is placed between neutral and i primary side ground of SMPS , how does it help in surge protection
 

but in some circuit i have seen that MOV is placed between neutral and i primary side ground of SMPS
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This won't comply with safety regulations, I guess, you have rather seen a capacitor in this place. It has to keep the requirements for Y capacitors.
 

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