Varistor Metal Oxide Varistor Products Page 85 Varistor Metal-Oxide Varistor Products

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17 Metal-Oxide Varistors (MOVs) Radial Leaded Varistors > HMOV Varistor Series Current Energy and Power Dissipation Ratings 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 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 1B - Power Derating for Phenolic Coated T 1 T 2 100 50 0 O 1 TIME PERCENT OF PEAK VALUE T Peak Pulse Current Test Waveform for Clamping Voltage 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 8/20s Current Waveform: 8s = T 1 = Rise Time 20s = T 2 = Decay Time Figure 2 For applications exceeding 85C ambient temperature, the peak surge current and energy ratings must be reduced as shown below. For applications exceeding 125C ambient temperature, the peak surge current and energy ratings must be reduced as shown below.

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