rwst www.vishay.com vishay sfernice revision: 27-may-13 1 document number: 50017 for technical questions, contact: sfer@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 fixed wirewound high power vitreous resistors electrical traction model features ? 95 w to 800 w at 25 c ?nf c 93-214 ? rb 25 x 168, rb 30 x 250 ? rugged construction for use in severe environmental conditions ? material categorization: for definitions of compliance please see www.vishay.com/doc?99912 the rwst vitreous wirewound high power resistors are known for thei r excellent reliability whic h has developed out of the vishay sfernice experience over several decades in the field of high current applications. extremely severe conditions of use are encountered in electri cal traction including repeated overloads. to withstand such conditions the new rwst model is extremel y rugged and is manufactured to a very carefully monito red process using the best materials. nf f 16101, 10/1988 and 16102, 04/1992: not applicable (o ur parts are made of metallic and refractory materials). ? nf c 93-214. performances according to nf c 93-214. ?cs? type 1 collars dimensions in millimeters a ? b 26 d e f ? c g h 15 j stainless steel 304 l collars ?cs? type 1 a 23 3 ? b 58 d e f g h 15 j stainless steel 304 l collars ?cs? type 2 welded stainless steel 304 l collars ?an? n ? c ? u ? b a l z k v p welded stainless steel 304 l band ?b? q s ? b a ? c r t
rwst www.vishay.com vishay sfernice revision: 27-may-13 2 document number: 50017 for technical questions, contact: sfer@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 dimensions in millimeters series connections a 2 ? b max. ? c min. d e f 0.5 g - 4/+ 0 h - 4/+ 0 j 0.5 k l + 0.5 + 0 rwst ? 25 x 138 an-b cs type 1 138 28 12 50 1.5 27 1 24 199 169 6.5 28.5 1 9 rwst ? 25 x 168 an-b cs type 1 168 28 12 50 1.5 27 1 24 229 199 6.5 28.5 1 9 rwst ? 30 x 250 an-b cs type 1 250 33 17 60 1.5 30 1 25 317 287 9 31 1 13 rwst ? 40 x 370 an cs type 2 370 45 22 69 max. 45 1.5 30 432 405 9 45 1.5 18 rwst ? 50 x 373 an cs type 2 373 53 27.1 80 max. 51 1.5 30 432 405 9 51 1.5 18 series connections n 2 p q - 0/+ 5 r - 0.3/+ 0.9 s max. t 1 ? u v z average unit weight in g (cs collars) rwst ? 25 x 138 an-b cs type 1 117 2 51.5 1.5 15 26 38.5 23.5 5.7 33.5 1 6 225 rwst ? 25 x 168 an-b cs type 1 147 2 50 1.5 15 26 38.5 23.5 5.7 33.5 1 6 250 rwst ? 30 x 250 an-b cs type 1 227 2 55 1.5 18 31 43.5 26 5.7 36 1 5 445 rwst ? 40 x 370 an cs type 2 332 3 81.5 max. - - - - 9.2 57 1.5 10 1400 rwst ? 50 x 373 an cs type 2 332 3 92.5 max. - - - - 9.2 63 1.5 11.5 2200 standard electrical specifications model size resistance range ? rated power p 25 c w tolerance % rwst 25 x 138 25138 2.7 to 82k 95 5, 10 rwst 25 x 168 25168 2.7 to 100k 160 5, 10 rwst 30 x 250 30250 4.7 to 220k 280 5, 10 rwst 40 x 370 40370 8.2 to 360k 500 5, 10 rwst 50 x 373 50373 12 to 430k 700 5, 10 mechanical specifications mechanical protection vitreous enamel resistive element ni-cr wire connections cs su pporting collars an collar or b on request average unit weight 225 g to 2200 g environmental specifications temperature range - 55 c + 450 c climatic category - 55 c/+ 200 c/56 days technical specifications resistance range 2.7 ? to 430 k ? (e12, e24 preferred series values) resistance tolerance standard 5 % power rating 95 w to 800 w at 25 c temperature coefficient 75 ppm/c (typical) shelf life 0.1 % year (typical) performance tests conditions requirements typical values and drifts short time overload 10 p r during 5 s voltage limited at < 5000 v 2 % or 0.05 ? 0.5 % climatic sequence - 55 c + 200 c 2 % or 0.05 ? insulation resistance 100 m ? 0.5 % humidity ? (steady state) 56 days 95 % relative humidity 3 % or 0.05 ? insulation resistance 100 m ? 0.5 % thermal shock load at 100 % p r followed by cold temperature exposure at - 55 c/15' 2 % or 0.05 ? 0.5 % shock severity 50 a 9 shocks/each side 1 % or 0.05 ? 0.25 % vibration severity 55b 1 % or 0.05 ? 0.25 % terminal strength an ? b traction 40 ncm torque 60 ncm 1 % or 0.05 ? 0.5 % load life 90'/30' cycle 1000 h at p r 25 c 5 % 1000 h 1 % 5000 h 2 %
rwst www.vishay.com vishay sfernice revision: 27-may-13 3 document number: 50017 for technical questions, contact: sfer@vishay.com this document is subject to change without notice. the products described herein and this document are subject to specific disclaimers, set forth at www.vishay.com/doc?91000 non inductive winding for high frequencies, low self induction resistors are available with special wind ings. rwstni designation. power rating temperature rise marking vishay sfernice trademark, model, style, nominal resistance (in ? ), tolerance (in %), manufacturing date. special features rwst style 25 x 138 25 x 168 30 x 250 40 x 370 50 x 373 designation nf c 93-214 - rb 25 x 168 rb 30 x 250 - - maximum power rating at 25 c 110 w 180 w 320 w 600 w 800 w ohmic range (e12, e24 series) 2.7 ? to 82 k ? 2.7 ? to 100 k ? 4.7 ? to 220 k ? 8.2 ? to 360 k ? 12 ? to 430 k ? critical resistance 18 k ? 20 k ? 30 k ? 36 k ? 30 k ? model and style rwstni 25 x 138 rwstni 25 x 168 rwstni 30 x 250 rwstni 40 x 370 rwstni 50 x 373 ohmic range ? (e12 series) 22 ? 2.5 k ? 22 ? 4 k ? 120 ? 6.8 k ? 120 ? 8.2 k ? 150 ? 8.2 k ? ambient temperature in c rated power in % 100 75 50 25 0 0 65 130 195 260 325 390 455 rated power in w hot spot temperature in c 400 300 200 100 0 10 100 1000 rwst 25 138 rwst 25 168 rwst 30 250 rwst 40 370 rwst 50 373 packaging box: fixed quantity depend ing on size and connections ordering information rwst 25 x 138 b 56u 5 % b06 e model style non-inductive winding optional special design optional connections ohmic value custom items are subject to extra-charge and min. order. please see price list. tolerance packaging lead (pb)-free global part number information global model size leads option ohmic value tolerance packaging special rwst 25 x 138 25 x 168 30 x 250 40 x 370 50 x 373 a = an b = b c = cs f = faston n = non inductive winding the first thre e digits are significant figures and the last digit specifies the number of zero s to follow. r designates decimal point. 4700 = 470 ? 48r8 = 48.7 ? r010 = 0.01 ? r470 = 0.47 ? j = 5.0 % k = 10 % box: bo1 bo2 bo2na bo4 bo4na bo6 bo6na as applicable. example: ba7 256c40j w s r t 1 8 70b 0 4
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