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P6002ACMC датащи(PDF) 120 Page - Teccor Electronics |
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P6002ACMC датащи(HTML) 120 Page - Teccor Electronics |
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120 / 212 page ![]() Secondary Protection http://www.teccor.com 3 - 32 © 2002 Teccor Electronics +1 972-580-7777 SIDACtor® Data Book and Design Guide Secondary Protection Reference Circuit Figure 3.38 also shows an example of an interface design for a secondary protector. The P3203AB SIDACtor device is used because the peak off-state voltage (VDRM) is greater than the potential of a Type B ringer signal superimposed on the POTS (plain old telephone service) battery. 150 VRMS Ö2 + 56.6 VPK = 268.8 VPK Coordination between the station protector and the secondary protector occurs due to the line impedance between the two devices. The line impedance helps ensure that the primary protector will begin to conduct while the secondary protector limits any of the let-through voltage to within the VS rating of the SIDACtor device. |
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