www.vishay.com 61 RWST vishay sfernice document number: 50017 revision 20-mar-02 for technical questions, contact sfer@vishay.com ?cs? type 1 collars the RWST vitreous wirewound high power resistors are known for their excellent reliability which has developed out of the vishay sfernice experience over several decades in the eld of high current applications. extremely severe conditions of use are encountered in electrical traction including repeated overloads. to withstand such conditions the new RWST model is extremely rugged and is manufactured to a very carefully monitored process using the best materials st ainless steel 304 l collars ? cs ? type stainless steel 304 l collars ? cs ? type a ? b 26 d e f ? c g h 15 j a 23 3 ? b 58 d e f g h 15 j fixed wirewound high power vitreous resistors electrical traction model features 95 watt to 800 watt at 25 c nf c 93-214 rb 25 x 168, rb 30 x 250 rugged construction for use in severe environmental conditions dimensions in millimeters RWST style connections 25 x 138 cs type 1/b/an 138 28 12 50 1.5 27 1 24 199 169 6.5 225 25 x 168 cs type 1/b/an 168 28 12 50 1 27 1 24 229 199 6.5 250 30 x 250 cs type 1/b/an 250 33 17 60 1.5 30 1 25 317 287 9 445 40 x 370 cs type 2/b/an 370 45 22 69 max. 45 1.5 30 432 405 9 1400 50 x 373 cs type 2/b/an 373 53 27.1 80 max. 51 1.5 30 432 405 9 2200 a 2 b max. c min. d e f 0.5 4 g 0 4 h 0 j 0.5 average unit weight in g (cs collars) dimensions in millimeters
document number: 50017 revision 20-mar-02 www.vishay.com 62 RWST vishay sfernice for technical questions, contact sfer@vishay.com non inductive winding for high frequencies, low self induction resistors are available with special windings. RWSTni designation. model and style ohmic range (e12 series) 22 ? 2.5k ? RWSTni 25 x 138 22 ? 4k ? RWSTni 25 x 168 120 ? 6.8k ? RWSTni 30 x 250 120 ? 8.2k ? RWSTni 40 x 370 150 ? 8.2k ? RWSTni 50 x 373 tests conditions requirements typical values and drifts short time overload 10pr during 5s voltage limited at < 5000v 2% or 0.05 ? 2% or 0.05 ? insulation resistance 100m ? 3% or 0.05 ? insulation resistance 100m ? 2% or 0.05 ? 1% or 0.05 ? 1% or 0.05 ? 1% or 0.05 ? 5% 0.5% 0.5% 0.5% 0.5% 0.25% 0.25% 0.5% 1000h 1% 5000h 2% 55 c + 200 c 56 days 95% relative humidity load at 100% pr followed by cold temperature exposure at 55 c/15 severity 50a 9 shocks/each side severity 55b 90 /30 cycle 1000h at pr 25 c climatic sequence humidity (steady state) thermal shock shock vibration terminal strength load life performance fixed wirewound high power vitreous resistors electrical traction model mechanical specifications mechanical protection vitreous enamel resistive element ni-cr wire connections cs supporting collars an collar or b on request average unit weight 225 to 2200g environmental specifications temperature limits 55 c + 450 c climatic category 55 c/+ 200 c/56 days resistance range 2.7 ? to 430k ? (e12-e24 preferred series values) resistance tolerance standard 5% power rating 95w to 800w at 25 c temperature coef cient 75ppm/ c (typical) shelf life 0.1% year (typical) electrical specifications RWST style designation nf c 93-214 limiting element voltage critical resistance 25 x 138 95w 110w 2.7 ? 82k ? 1400v 18k ? 25 x 168 rb 25 x 168 160w 180w 2.7 ? 100k ? 1900v 20k ? 30 x 250 rb 30 x 250 280w 320w 4.7 ? 220k ? 3000v 30k ? 40 x 370 500w 600w 8.2 ? 360k ? 4500v 36k ? 50 x 373 700w 800w 12 ? 430k ? 5000v 30k ? power rating at 25 c maximum power rating at 25 c p max. ohmic range (e12, e24 series) special features an traction 40ncm b torque 60ncm
www.vishay.com 63 RWST vishay sfernice document number: 50017 revision 20-mar-02 for technical questions, contact sfer@vishay.com power rating chart ambient temperature in degrees celsius % rated power 100 75 50 25 0 0 65 130 195 260 325 390 455 temperature rise marking sfernice trademark, model, style, nominal resistance (in ? ), tolerance (in %), manufacturing date. rated power in watts hot spot temperature in c 400 300 200 100 0 10 100 1000 RWST 25x13 8 r w s t 25x168 r w s t 30x250 r w s t 40x370 rw s t 50x373 30 x 250 model tolerance special design non-inductive bobinage ni optional optional 5% RWST style ordering information ohmic value 6.8k ? custom items are subject to extra-charge and min. order. please see price list. fixed wirewound high power vitreous resistors electrical traction model connections cs
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