www.vishay.com for technical questions, contact: sfer@vishay.com document number: 50017 61 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 decade s 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. dimensions in millimeters ?cs? type 1 collars 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 s tainle ss s teel 304 l co llar s ?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 62 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 rwst style 25 x 13 8 25 x 16 8 30 x 250 40 x 370 50 x 373 connections an-b cs type 1 an-b cs type 1 an-b cs type 1 an cs type 2 an cs type 2 a 2 138 168 250 370 373 ? b max. 28 28 33 45 53 ? c min. 12 12 17 22 27.1 d 50 1.5 50 1.5 60 1.5 69 max. 80 max. e 27 1 27 1 30 1 45 1.5 51 1.5 f 0.5 24 24 25 30 30 g - 4/+ 0 199 229 317 432 432 h - 4/+ 0 169 199 287 405 405 j 0.5 6.5 6.5 9 9 9 k 28.5 1 28.5 1 31 1 45 1.5 51 1.5 l - 0/+ 0.5 9 9 13 18 18 n 117 2 147 2 227 2 332 3 332 3 p 51 1.5 51 1.5 55 1.5 81.5 max. 92.5 max. q - 0/+ 0.5 15 15 18 - - r - 0.3/+ 0.9 26 26 31 - - s max. 38.5 38.5 43.5 - - t 1 23.5 23.5 26 - - ? u 5.7 5.7 5.7 9.2 9.2 v 33.5 1 33.5 1 36 1 57 1.5 63 1.5 z 6 6 5 10 11.5 average unit weight in g (cs collars) 225 250 445 1400 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 pr 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 % pr 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 pr 25 c 5 % 1000 h 1 % 5000 h 2 %
www.vishay.com for technical questions, contact: sfer@vishay.com document number: 50017 63 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 re sistors are available with special windings. rwstni designation. power rating chart temperature rise 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 p max. 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 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 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
document number: 50017 for technical questions, contact: sfer@vishay.com www.vishay.com revision: 12-may-09 64 rwst fixed wirewound high powe r vitreous resistors electrical traction model vishay sfernice packaging box: fixed quantity depending on size and connections. marking sfernice trademark, model, style, nominal resistance (in ), tolerance (in %), manufacturing date. ordering information rwst 25 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 2513 8 2516 8 30250 40370 50373 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
document number: 91000 www.vishay.com revision: 18-jul-08 1 disclaimer legal disclaimer notice vishay all product specifications and data are subject to change without notice. vishay intertechnology, inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, ?vishay?), disclaim any and all liability fo r any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. vishay disclaims any and all li ability arising out of the use or application of any product describ ed herein or of any information provided herein to the maximum extent permit ted by law. the product specifications do not expand or otherwise modify vishay?s terms and conditions of purcha se, including but not limited to the warranty expressed therein, which apply to these products. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of vishay. the products shown herein are not designed for use in medi cal, life-saving, or life-sustaining applications unless otherwise expressly indicated. customers using or selling vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify vishay for any damages arising or resulting from such use or sale. please contact authorized vishay personnel to obtain written terms and conditions regarding products designed for such applications. product names and markings noted herein may be trademarks of their respective owners.
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