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De-rating of resistance is needed since maximum ambient temperature is 35ºC. From Ametherm R/T curve, the coefficient of 35ºC for de-rating is 0.717. The minimum resistance needed at 25ºC will be MinR = Rated Resistance at 25ºC / Coefficient at 35ºC = 5.70 / 0.717, MinR = 7.94 Ohms, Ametherm MS32 10015 is the correct selection for this example. Rated: 10 Ohms @ 25ºC, 250 Joules, 15 A Maximum Steady State Current, UL Recognized, and RoHS Compliant.
PTM Published on: 2013-10-17