RC1313

ELECTRONIC FILM CAPACITORS, INC. Reidville Industrial Park * 41 Interstate Lane WATERBURY, CONNECTICUT 06705 PHONE (203) 755-5629 FAX (203) 755-0659 www.DataSheet4U.com RESISTOR-CAPACITOR NETWORKS APPLICATIONS Noise suppression and contact protection SERIES RC1313 RN RL L RL OR Vsource RN CN L Vsource CN Fig. 1 (across the load) Fig. 2 (across the contacts) The circuit to be used is dependent upon particular situations. Either circuit may be enough protection for your needs. For extreme situations, both "Load" and "Contact" protection may be required. Recommendations There are two types of discharges that can damage switching contacts and generate noise: (1) "Glow Discharges" caused by the ignition of gases between contacts. These develop at about 320 volts at about a 0.0003 inch gap range and can be sustained at a much wider gap range. (2) "Arc Discharges" occur at much lower voltages, about 0.5 MV/cm. Minimum voltages and currents are necessary for "Arc Discharges" to be sustained. Contact material also plays a role in sustained "Arc Discharges". (see Table 1) MATERIAL Silver Gold Gold Alloy Palladium Platinum MIN. (VA) Arcing Voltage MIN. (IA) Arcing Current mA 12 15 9 16 17.5 400 400 400 800 700 The function of the RC network is to: (1) Keep the voltage across the contacts below 300 volts. C> (IL/300)2L (2) Keep the rate of voltage change below 1V/µs. C> IL x 10-6 (3) Keep the current below that described in Table 1. TABLE 1 Inductors do not instantl...