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What factors affect the choice of a resistor/capacitor RC suppressor or a varistor suppressor?

Issue:
Why would an RC suppressor be used instead of a varistor?

Product Line:
Suppressors

Environment:
Schneider Electric Products

Resolution:
1) The RC units are used with AC coils only. The varistor units are used with AC or DC coils
2) The RC units drop out time is 1.2 to 2 times normal compared to the varistor 1.1 to 1.5 times normal.
3) The RC unit limits transient voltage to 300% of the nominal voltage maximum compared to a varistor 200% of nominal voltage maximum.

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