document number: 50018 revision 20-mar-02 www.vishay.com 64 RSO vishay sfernice for technical questions, contact sfer@vishay.com a 23 3 b 58 c j k m g h 15 l a 26 b j k c m g h 15 l fixed wirewound enamelled corrugated tape resistors very high dissipation cs collars an collars the remarkable dissipation power of this series is the result of an original winding method using corrugated edge-wound tape, thus forming a very active radiator. the enamelling follows the contour of the resistive element and provides effective insulation and support for the winding. the tubular core is of special ceramic, capable of withstanding high thermal shock and overload of short duration. screwed stainless steel 304 l cs type 2 screwed stainless steel 304 l an type 1 a z f p b q r c c d e screwed stainless steel 304 l cs type 1 features 160 watt to 1kw at 25c dimensions type 2 screwed - 4 - 0 - 4 - 0 + 0.5 + 0 a 2 ? b max. ? c min. d max. e f z g h j k l 0.5 m 0.5 p q r average weight in g RSO style connections 25 x 138 an type 1 cs type 1 138 39 12.6 54 33.5 1 9 6 199 169 50 1.5 27 1 6.5 24 117 2 5.7 28.5 1 160 205 25 x 168 an type 1 cs type 1 168 39 12.6 54 33.5 1 9 6 229 199 50 1.5 27 1 6.5 24 147 2 5.7 28.5 1 190 235 30 x 250 an type 1 cs type 1 250 44 17.4 62 36 1 13 5 317 287 60 1.5 30 1 9 25 227 2.5 5.7 31 1 350 400 40 x 370 an type 2 cs type 2 370 54.5 22.3 85.8 57 1.5 18 10 432 405 73.8 45 1.5 9 30 332 3 9.2 45 1.5 960 1040 50 x 373 an type 2 cs type 2 373 65 27.1 97 63 1.5 18 11.5 432 405 79 45 1.5 9 30 332 3 9.2 51 1.5 1375 1455 dimensions in millimeters an cs
www.vishay.com 65 RSO vishay sfernice document number: 50018 revision 20-mar-02 for technical questions, contact sfer@vishay.com recommendations for use overload: the RSO resistors are capable of withstanding overloads of about 10pr for a maximum period of 5 seconds; they can resist momentarily even greater overloads. the following table shows the admissible load k x pr in watts. tests conditions requirements typical values and drifts short time overload 10pr during 5s 2% or 0.05 ? 2% or 0.05 ? 3% or 0.05 ? 5% 1% 1% 1% 2% load at pr followed by cold temp. exposure at ? 55 c/15 sec phase a: + 200 phase c: ? 55 phase d: 5 cycles 90/30' cycle 1000h at pr 25 c thermal shock climatic sequence load life performance fixed wirewound enamelled corrugated tape resistors very high dissipation mechanical specifications mechanical protection enamel resistive element ni-cr wire connections an cs supporting collars average unit weight 160 to 1455g environmental specifications temperature limits ? 55 c + 450 c climatic category - 55 c/+ 200 c/56 days resistance range 0.068 ? to 68m ? (e12-e24 preferred series) standard resistance tolerance rn 1 ? 5% rn < 1 ? 10% power rating 160 w to 1kw at 25 c temperature coef cient 180ppm/ c typical electrical specifications 25 x 138 160w 0.068 ? 12 ? 25 x 168 200w 0.10 ? 18 ? 30 x 250 350w 0.22 ? 33 ? 40 x 370 700w 0.33 ? 56 ? 50 x 373 1000w 0.39 ? 68 ? power rating at 25 c RSO style resistance ohmic range (e12, e24 series) special features cycle period (load + break) overload period in seconds 2 2.5 3 4 5 4 5 6 8 10 7 9 12 16 20 9 12 15 23 30 6 5 4 3 2 15s 30s 60s 120s k
document number: 50018 revision 20-mar-02 www.vishay.com 66 RSO vishay sfernice for technical questions, contact sfer@vishay.com power rating chart ambient temperature in degrees celsius % rated power 100 75 50 25 0 0 100 200 300 400 450 temperature rise marking sfernice trademark, model, style, nominal resistance (in ? ), tolerance (in %), manufacturing date. rated power in watts hot spot temperature in c 450 400 300 200 100 0 10 100 1000 r so 25 x 138 r s o 25 x 168 RSO 30 x 250 RSO 40 x 370 RSO 50 x 3 7 3 25 x 168 style model RSO tolerance 10% special design method n optional ordering information ohmic value 0.3 ? custom items are subject to extra-charge and min. order. please see price list. cs connections fixed wirewound enamelled corrugated tape resistors very high dissipation
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