Varistor Metal Oxide Varistor Products Page 113 Varistor Metal-Oxide Varistor Products

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17 Metal-Oxide Varistors (MOVs) Radial Lead Varistors > C-III Varistor Series Should transients occur in rapid succession, the average power dissipation 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 Current Energy and Power Dissipation Ratings Peak Pulse Current Test Waveform 100 90 50 10 O 1 T 1 T 2 TIME PERCENT OF PEAK VALUE 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 1A - Power Derating for Epoxy Coated Figure 2 10000 1000 100 0.001 0.01 0.1 1 10 100 1000 10000 PEAK CURRENT (A) MAXIMUM PEAKVOLTAGE (V) 10000 1000 100 0.001 0.01 0.1 1 10 100 1000 10000 PEAK CURRENT (A) MAXIMUM PEAKVOLTAGE (V) MODEL SIZE = 10MM T A = -55 o C TO 85 o C 130 to 625V M(AC) RATING MAXIMUM CLAMP VOLTAGE 625 460 440 385 230 250 275 300 320 175 150 140 130 420 550 510 Maximum Clamping Voltage for 10mm Parts V130LA5C(P) - V625LA10C(P) 10 4 10 5 10 6 ` 10 3 10 2 1 15 10 100 1,000 10,000 SURGE IMPULSE DURATION ( s) 10,000 1,000 100 10 1 RATED PEAK SURGE CURRENT (A) MODEL SIZE = 10mm T A = -55 o C TO 85 o C Repetitive Surge Capability for 10mm Parts V130LA5C(P)-V320LA10C(P) Figure 3 Figure 4 Transient V-I Characteristics Curves Pulse Rating Curves 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 device. The operating values of a MOV need to be derated at high temperatures as shown above. Because varistors only dissipate a relatively small amount of average power they are not suitable for repetitive applications that involve substantial amounts of average power dissipation. Figure 1B - Power Derating for Phenolic Coated

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