Varistor Metal Oxide Varistor Products Page 194 Varistor Metal-Oxide Varistor Products

2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 09/14/17 Metal-Oxide Varistors (MOVs) Industrial High Energy Terminal Varistors > DHB34 Series Should transients occur in rapid succession, the average power 100 dissipation result is simply 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. The operating values must be derated as shown in above. Power Dissipation Ratings 100 90 50 10 O 1 T 1 T 2 TIME PERCENT OF PEAK VALUE Peak Pulse Current Test Waveform Maximum Clamping Voltage DISC SIZE 34mm V131DHB34 - V751DHB34 50,000 20,000 10,000 5,000 2,000 1,000 500 200 100 50 20 10 20 100 1,000 10,000 SURGE CURRENT (A) IMPULSE DURATION (s) 10 1 INDEFINITE 10 5 10 2 10 3 10 4 10 6 Repetitive Surge Capability NOTE: If pulse ratings are exceeded, a shift of V N(DC) (at specified current) of more than +/-10% could result. This type of shift, which normally results in a decrease of V N(DC) , may result in the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide ample protection. 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 1000 10000 0.001 0.01 0.1 1 10 100 10000 100000 Maximum Clamping Voltage DHB34 Series 110 to 750V AC Rating TA = -55 C to 85C Current - AMPS V751 V681 V661 V571 V551 V511 V391 V351 V331 V321 V271 V251 V201 V181 V151 V141 V111 V131 V301 V481 V441 V421 100 1000 Voltage - VOLTS Figure 1 Figure 2 Figure 3 Figure 4

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