Metal-Oxide Varistors (MOVs) High Energy Industrial Disc Varistors > CA Series CA Varistor Series Description The CA Series of transient surge suppressors are industrial high-energy disc varistors (MOVs) intended for special applications requiring unique electrical contact or packaging methods provided by the customer. The electrode finish of these devices is solderable and can also be used with pressure contacts. Discs of the same diameter may be stacked. This series of industrial disc varistors are nominal 60mm diameter, with disc thickness ranging from 2.7mm to 32mm. The voltage range is 250V to 2800 V . (AC)RMS For information on soldering considerations, refer to EC637 Recommendations for Soldering Terminal Leads to MOV Additional Information Varistor Discs Features Datasheet Resources Samples Standard disc size High peak pulse nominal 60mm current range diameter 50000A to 70000A Discs have edge Very highenergy passivation insulation capability W tm 880J to 10000J Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart Continuous CA Series Units Steady State Applied Voltage: AC Voltage Range (V ) 250 to 2800 V M(AC)RMS DC Voltage Range (V ) 330 to 3500 V M(DC) Transient: Peak Pulse Current (I ) TM For 8/20s Current Wave(See Figure 2) 20,000 to 70,000 A Single-Pulse Energy Range For 2ms Current Square Wave (W ) 880 to 10,000 J TM Operating Ambient Temperature Range (T ) -55 to +85 C A Storage Temperature Range (T ) - 55 to +85 C STG Temperature Coefficient (V) of Clamping Voltage (V ) at Specified Test Current <0.01 %/C C CAUTION: Stresses above those listed inAbsolute Maximum Rating may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17Metal-Oxide Varistors (MOVs) High Energy Industrial Disc Varistors > CA Series CA Series Ratings & Specifications Maximum Rating (85C) Specifications (25C) Continuous Transient Max Clamping Varistor Voltage at 1mA Volt Vc at 200A Typical Part Peak Size Energy DC Test Current Current Capacitance Number V V Current DC RMS (2ms) (8/20s) Device Branding (8/20s) V V W I Min V Max V f = 1MHz M(AC) M(DC) TM TM NOM C (mm) (V) (V) (J) (A) (V) (V) (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 60 1100 1400 3800 70000 1665 1850 2035 2940 2200 V142CA60 60 1400 1750 5000 70000 2070 2300 2530 3600 1800 V172CA60 60 1700 2150 6000 70000 2500 2700 3030 4300 1500 V202CA60 60 2000 2500 7500 70000 2970 3300 3630 5200 1200 V242CA60 60 2400 3000 8800 70000 3510 3900 4290 6200 1000 V282CA60 60 2800 3500 10000 70000 4230 4700 5170 7400 800 NOTE: Average power dissipation of transients should not exceed 2.5W for CA60 discs. Power Dissipation Ratings Peak Pulse Current Test Waveform 100 100 90 90 80 70 60 50 50 40 30 20 10 10 O T TIME 0 1 -55 50 60 70 80 90 100110 120130 140150 T 1 o AMBIENT TEMPERATURE ( C) T 2 Figure 2 Figure 1 O = Virtual Origin of Wave 1 FIGURE 1. CURRENT, ENERGY AND POWER DERATING T = Time From 10% to 90% of Peak Should transients occur in rapid succession, the average power 0 = Virtual Origin of Wave CURVE 1 T = Virtual Front Time = 1.25 t 1 dissipation result is the energy (watt-seconds) per pulse times T = Time from 10% to 90% of Peak T = Virtual Time to Half Value (Impulse Duration) the number of pulses per second. The power so developed must 2 T = Rise Time = 1.25 x T 1 be within the specifications shown on the Device Ratings and Example: For an 8/20 s Current Waveform: T = Decay Time 2 Specifications table for the specific device. Furthermore, the 8s = T = Virtual Front Time 1 Example - For an 8/20 s Current Waveform: operating values need to be derated at high temperatures as 20 s = T = Virtual Time to Half Value 2 8s = T = Rise Time shown in above. Because varistors can only dissipate a relatively 1 20s = T = Decay Time small amount of average power they are, therefore, not suitable 2 FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM for repetitive applications that involve substantial amounts of average power dissipation. 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17 PERCENT OF RATED VALUE PERCENT OF PEAK VALUE