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SCC-Slide7

The second circuit where Safety Certified Capacitors are used is the isolation circuit. The capacitors are used for isolation between the Telecom Network Voltage, or TNV, and protective earth, sometimes called SELV. The values used in this circuit are usually less than 100pF. RJ11 applications use either X2/Y3 or X1/Y2 rated capacitors. The X1/Y2 capacitors offer higher surge immunity and can reduce the number of failures in the field due to surges on the line. This is why they are used in some applications since the higher part cost is justified by the reduction in field failures.

PTM Published on: 2011-09-27