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305C9 Datasheet(PDF) 6 Page - Vishay Siliconix |
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305C9 Datasheet(HTML) 6 Page - Vishay Siliconix |
6 / 6 page www.vishay.com 8 305C Series Vishay Cera-Mite ceramite.support@vishay.com Document Number: 23086 Revision 14-May-02 PTCR Motor Start Packages VISHAY CERA-MITE MOTOR START FEATURES ADVANCED CERAMIC ENGINEERING FOR HVAC Vishay Cera-Mite’s capability in large diameter ceramic pellets, unique formulations tailored to motor starting, and heavy duty electrode systems, have been developed and proven with the cooperation of HVAC industry experts over a period of 20 years. INHERENT PERFORMANCE Large diameter pellets make possible low resistance start devices needed to match torque requirements of high efficiency compressor motors. Various package sizes offer selection of timing intervals, providing optimum switching time without dependence on sensing speed, counter EMF, or current. RUGGED MECHANICAL CONSTRUCTION Vishay Cera-Mite PTCR cases are molded from a UL94V0 high temperature, engineered plastic/glass composite. Heavy duty aluminum contact plates and stainless steel force springs are scaled to the pellet sizes and current ratings to insure no internal arcing and to enhance quick reset time. Unbreakable metal mounting brackets attach securely with a single screw. The NEW “U” - brackets developed by Vishay Cera-Mite feature lower power consumption and greater reliability by maximizing case to ground thermal impedance. SIMPLE AND ECONOMICAL A solid state device requiring only 2 quick connect wires and one bracket screw to install. Compared to the alternative start capacitor and relay, PTCR start devices save several wires, occupy less panel space, mount more easily, and cost less. OUTSTANDING RELIABILITY Over a fifteen year period, with an installed base of millions of Vishay Cera-Mite PTCR start devices, experience has demonstrated reliability at 1.0 FITS or less. Users have benefited from very low warranty expense. RESTART CONSIDERATIONS A properly sized PTCR will provide adequate starting current and starting time with a cool down time of 3 to 5 minutes, coordinating perfectly with standard “off delay” equalization timers Restart characteristics of the three case sizes are shown. Fig T-13 Fig T-14 Fig T-15 25 % Initial Current CASE STYLE C 50 75 100 0 0 .2 .4 .6 .8 Time In Seconds 5 Min. Cooling 3 Min. Cooling Cold Start CASE STYLE B 0 .2 .4 .6 .8 Time In Seconds 1.0 5 Min. Cooling 3 Min. Cooling Cold Start 25 50 75 100 0 CASE STYLE A 0 .2 .4 .6 .8 1.0 25 50 75 100 0 1.2 Cold Start 3 Min. Cooling Time In Seconds 5 Min. Cooling |
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