BWD vishay draloric www.vishay.com 108 document number 21019 revision 27-aug-02 for technical questions, contact ww1resistors@vishay .com features ? wirewound resistor with high power rating ? anodized aluminum casing to utilize heat-sink effect ? self-protecting ? short circuit proof ? protection according to ip 54 aluminum housed wirewound resistors parameter unit BWD 250 BWD 500 rated dissipation at 70 c w 100 200 rated dissipation at 20 c, 35% ed w 250 500 limiting element voltage 2) vdc/ac 700/ 1000 insulation voltage (1 min) vdc/ac peak > 4000 thermal time constant sec 400 800 insulation resistance at 1000vdc ? 10 8 category temperature range c - 55/+ 250 inductance l h 50 capacitance vs housing c pf 300 failure rate 10 -9 /h < 1000 weight/1000 pieces g 280 550 technical characteristics standard electrical specifications notes: 1) further values and tolerances on request 2) rated voltage model power rating limiting element temperature resistance tolerance p 70 c voltage 2) coefficient values 1) w v (ppm/k) ? % BWD 250 100 350 + 20...+ 100 10, 27, 33, 47, 72, 100, 5 150, 200, 220, 330, 430, 620, 830 BWD 500 200 350 + 20...+ 100 10, 12, 15, 22, 27, 35, 40, 5 43, 47, 50, 60, 72, 100, 130, 150, 160, 200, 210, 240, 300, 310, 430, 620 p x r ordering information BWD 250 100r 5% model size resistance value tolerance ? % note: 2) rated voltage
www.vishay.com 109 BWD vishay draloric document number 21019 revision 27-aug-02 for technical questions, contact ww1resistors@vishay .com dimensions aluminum housed wirewound resistors model dimensions in millimeters [inches] abcdefghjklm BWD 250 1108015676010309822 4.6 - 4.9 510 6 [4.331] [3.15] [0.591] [2.638] [2.362] [0.394] [1.181] [3.858] [0.866] [0.181 - 0.193] [20.079] [0.236] BWD 500 261 80 15 67 60 10 30 204 22 4.6 - 4.9 510 6 [8.504] [3.15] [0.591] [2.638] [2.362] [0.394] [1.181] [8.031] [0.866] [0.181 - 0.193] [20.079] [0.236] tol. 1.5 1 0.5 0.3 0.2 0.2 0.5 0.4 2 40 0.1 [ 0.059] [ 0.039] [ 0.020] [ 0.012] [ 0.008] [ 0.008] [ 0.020] [ 0.016] [ 0.079] [ 1.575] [ 0.004] performance test conditions of test test results endurance test at 70 c iec 60115-1 4.25.1 2.0% 1000 hours at 70 c endurance test at uct iec 60115-1 4.25.3 2.0% 1000 hours at 200 c without load overload test iec 60115-1 4.13 2.0% short time overload for 5 seconds thermal shock iec 60115-1 4.19 iec 68-2-14 1.0% rapid change between upper and lower category temperature damp heat steady state iec 60115-1 4.24 iec 68-2-3 1.0% 56 days at 40 c and 93% relative humidity 120 100 80 60 40 20 0 -55 -50 50 150 250 350 rated power in % derating surface temperature (at continuous load) ambient temperature in c power in w temperature rise in c 0 50 100 150 200 250 300 300 200 100 0 BWD 250 BWD 500 xx/xx 000 k m c d j l h a g e b f 40 marking
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