Varistor Metal Oxide Varistor Products Page 198 Varistor Metal-Oxide Varistor Products

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17 Metal-Oxide Varistors (MOVs) High Energy Industrial Disc Varistors > CA Series CA Series Ratings & Specifications Part Number Device Branding Size Maximum Rating (85C) Specifications (25C) Continuous Transient Varistor Voltage at 1mA DC Test Current Max Clamping Volt Vc at 200A Current (8/20 s) Typical Capacitance V RMS V DC Energy (2ms) Peak Current (8/20 s) V M(AC) V M(DC) W TM I TM Min V NOM Max V C f = 1MHz (mm) (V) (V) (J) (A) (V) (A) (pF) V251CA60 60 250 330 880 50000 351 390 429 620 10000 V271CA60 60 275 369 950 50000 387 430 473 680 9000 V321CA60 60 320 420 1100 50000 459 510 561 760 7500 V421CA60 60 420 560 1500 70000 612 680 748 1060 6000 V481CA60 60 480 640 1600 70000 675 750 825 1160 5500 V511CA60 60 510 675 1800 70000 738 820 902 1300 5000 V571CA60 60 575 730 2100 70000 819 910 1001 1420 4500 V661CA60 60 660 850 2300 70000 945 1050 1155 1640 4000 V751CA60 60 750 970 2600 70000 1080 1200 1320 1880 3500 V881CA60 60 880 1150 3200 70000 1350 1500 1650 2340 2700 V112CA60 V142CA60 V172CA60 V202CA60 V242CA60 V282CA60 60 1100 1400 1700 2000 2400 2800 1400 1750 2150 2500 3000 3500 3800 5000 6000 7500 8800 10000 70000 1665 2070 2500 2970 3510 4230 1850 2300 2700 3300 3900 4700 2035 2530 3030 3630 4290 5170 2940 3600 4300 5200 6200 7400 2200 1800 1500 1200 1000 800 NOTE: Average power dissipation of transients should not exceed 2.5W for CA60 discs. Should transients occur in rapid succession, the average power dissipation result is the energy (watt-seconds) per pulse times the number of pulses per second. The power so developed must be within the specifications shown on the Device Ratings and Specifications table for the specific device. Furthermore, the operating values need to be derated at high temperatures as shown in above. Because varistors can only dissipate a relatively small amount of average power they are, therefore, not suitable for repetitive applications that involve substantial amounts of average power dissipation. Power Dissipation Ratings 100 90 50 10 O 1 T 1 T 2 TIME Peak Pulse Current Test Waveform 0 1 = Virtual Origin of Wave T = Time from 10% to 90% of Peak T 1 = Rise Time = 1.25 x T T 2 = Decay Time Example - For an 8/20 s Current Waveform: 8 s = T 1 = Rise Time 20 s = T 2 = Decay Time 100 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150 AMBIENT TEMPERATURE ( o C) PERCENT OF RATED VALUE Figure 1 Figure 2

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