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Edit: Corrected differential mode MOV.
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Johan
Johan
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In some application notes for MOVs I see example usage in power supply design where each input line (N, L) from the mains are protected with a MOV to a ground voltage reference (as well as a common-modedifferential mode MOV protection between the input lines)

What I don't understand is what is the 0V "ground" reference these application notes are referring to?

It is both regulatory and practically impossible to use the PE (=FG) since even the smallest MOV current could trigger the earth protection circuit breaker.

In some application notes for MOVs I see example usage in power supply design where each input line (N, L) from the mains are protected with a MOV to a ground voltage reference (as well as a common-mode MOV protection between the input lines)

What I don't understand is what is the 0V "ground" reference these application notes are referring to?

It is both regulatory and practically impossible to use the PE (=FG) since even the smallest MOV current could trigger the earth protection circuit breaker.

In some application notes for MOVs I see example usage in power supply design where each input line (N, L) from the mains are protected with a MOV to a ground voltage reference (as well as a differential mode MOV protection between the input lines)

What I don't understand is what is the 0V "ground" reference these application notes are referring to?

It is both regulatory and practically impossible to use the PE (=FG) since even the smallest MOV current could trigger the earth protection circuit breaker.

Source Link
Johan
Johan
  • 143
  • 4

What is the 0V reference for MOV's input protection on power supply?

In some application notes for MOVs I see example usage in power supply design where each input line (N, L) from the mains are protected with a MOV to a ground voltage reference (as well as a common-mode MOV protection between the input lines)

What I don't understand is what is the 0V "ground" reference these application notes are referring to?

It is both regulatory and practically impossible to use the PE (=FG) since even the smallest MOV current could trigger the earth protection circuit breaker.