www.vishay.com for technical questions, contact: sfer@vishay.com document number: 50017 112 revision: 12-may-09 rwst vishay sfernice 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 ? compliant to rohs directive 2002/95/ec the rwst vitreous wirewound high power resistors are known for their excellent reliability which has developed out of the vishay sfernice experience over several dec ades in the field of high current applications. extremely severe conditions of use are encountered in electrical traction includ ing repeated overloads. to withstand such conditions the new rwst model is extremely rugged and is manuf actured to a very carefully monitored process using the best materials. nf f 16101, 10/1988 and 16102, 04/1992: not applicable (our 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
document number: 50017 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 12-may-09 113 rwst fixed wirewound high powe r vitreous resistors electrical traction model vishay sfernice mechanical specifications mechanical protection vitreous enamel resistive element ni-cr wire connections cs supporting collars an collar or b on request average unit weigh t 225 g to 2200 g environmental specifications temperature limits - 55 c + 450 c climatic category - 55 c/+ 200 c/56 days 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 13 8 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 16 8 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 ? uv z average unit weight in g (cs collars) rwst 25 x 13 8 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 16 8 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 electrical 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 % special features rwst style 25 x 13 8 25 x 16 8 30 x 250 40 x 370 50 x 373 designation nf c 93-214 - rb 25 x 168 rb 30 x 250 - - power rating at 25 c 95 w 160 w 280 w 500 w 700 w maximum power rating at 25 c 110 w 180 w 320 w 600 w 800 w ohmic range (e12, e24 series) 2.7 82 k 2.7 100 k 4.7 220 k 8.2 360 k 12 430 k limiting element voltage 1400 v 1900 v 3000 v 4500 v 5000 v critical resistance 18 k 20 k 30 k 36 k 30 k
www.vishay.com for technical questions, contact: sfer@vishay.com document number: 50017 114 revision: 12-may-09 rwst vishay sfernice fixed wirewound high powe r vitreous resistors electrical traction model non inductive winding for high frequencies, low self induction resistors ar e available with special windings. rwstni designation. power rating temperature rise marking vishay sfernice trademark, m odel, style, nominal resistance (in ), tolerance (in %), manufacturing date. model and style rwstni 25 x 13 8 rwstni 25 x 16 8 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 depending on size and connections ordering information rwst 25 x 13 8 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 13 8 25 x 16 8 30 x 250 40 x 370 50 x 373 a = an b = b c = cs f = faston n = non inductive winding the first three digits are significant figures and the last digit specifies the number of zeros to follow. r designates decimal point. 4700 = 470 4 8 r 8 = 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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