Varistor Metal Oxide Varistor Products Page 188 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 Terninal Varistors > HB34, HF34 & HG34 Series Should transients occur in rapid succession, the average power 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 Clamping Voltage for HB34, HF34 and HG34 Series 1000 10000 1mA 10mA 100mA 1A 10A 100A 10000A 100000A Maximum Clamping Voltage HB34, HF34, and HG34 series TA = -55 C to 85C Current - AMPS Voltage - VOLTS V751 V681 V661 V571 V551 V511 V391 V351 V331 V321 V271 V251 V201 V181 V151 V141 V111 V131 V301 V481 V441 V421 100 1000A Surge Current Rating Curves for HB34, HF34 and HG34 Series 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) 15 1 INDEFINITE 10 5 10 2 10 3 10 4 10 6 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 Figure 1 Figure 2 Figure 3 Figure 4

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