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V460LA40CP Datasheet(PDF) 7 Page - Littelfuse |
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V460LA40CP Datasheet(HTML) 7 Page - Littelfuse |
7 / 10 page Varistor Products ©2010 Littelfuse, Inc. Revision: September 9, 2010 C-III Varistor Series Radial Lead Varistors > C-III series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/c-iii.html for current information. NUMBER OF SURGES (RATED FOR 120 PULSES) 0100 50 150 250 300 200 600 550 500 450 400 350 300 V175LA20C 750A (8/20μs) AC Bias Reliability The C-III Series MOVs were designed for use on the AC line. The varistor is connected across the AC line and is biased with a constant amplitude sinusoidal voltage. It should be noted that the definition of failure is a shift in the nominal varistor voltage (V this type of varistor is still functioning normally after this tolerance will begin to dissipate more power. statistically designed tests were performed to determine the reliability of the C-III type of varistor under AC bias combined with high levels of temperature stress. To the diagram at right. Transient Surge Current/Energy Transient Capability The transient surge rating serves as an excellent figure of merit for the C-III varistor. This inherent surge handling capability is one of the C-III varistor’s best features. The enhanced surge absorption capability results from improved process uniformity and enhanced construction. The homogeneity of the raw material powder and improved control over the sintering and assembly processes are contributing factors to this improvement. worst case surge occurrence will be 3kA. Such a transient event may occur up to five times over the equipment life time (approximately 10 years). While the occurences of repetitive surge current for the C-III Series is 20 pulses for the 20mm units and 10 pulses for the 14mm Series. a worst case repetitive transient surges test. After 20 the device characteristics. Changes in the clamping negligible changes in any of the device characteristics In both cases the inherent device capability is far in excess of the expected worst case scenario. 300 250 200 150 100 0 100 200 300 400 500 600 700 800 900 1000 1100 TIME (HOURS) V130LA20C 500 450 400 350 300 NUMBER OF SURGES V130LA20C 3kA (8/20μs) (RATED FOR 20 PULSES) 010 515 25 30 20 High Temperature Operating Life 125ºC for 1000 Hours at Rated Bias Typical Repetitive Surge Current Capability of C-III Series MOVs Figure 12 Figure 13 Figure 14 |
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