document number: 50020 revision 27- j un-02 www.vishay.com 70 RSSD vishay sfernice for technical questions, contact sfer@vishay.com adjustable wirewound vitreous resistors low ohmic values features 16w to 600w at 25c high power rating heavy overloads low ohmic values great endurance excellent withstanding of thermal shock mechanical strength fire proof *cs connections on request welded stainless steel 304 l collars ?an? type 1 RSSD style connection 25 x 138 an type 1 cs type 1 138 27 16.4 117 ?2 33.5 ?1 9 199 169 50 ?1.5 27 ?1 6.5 24 51 ?1.5 5.7 28.5 ?1 6 90 135 25 x 168 an type 1 cs type 1 168 27 16.4 147 ?2 33.5 ?1 9 229 199 50 ?1.5 27 ?1 6.5 24 51 ?1.5 5.7 28.5 ?1 6 115 160 30 x 250 an type 1 cs type 1 250 32 21.3 227 ?2.5 36 ?1 13 317 287 60 ?1.5 30 ?1 9 25 55 ?1.5 5.7 31 ?1 5 240 290 40 x 370 an type 2 cs type 2 370 43 22.3 332 ?3 57 ?1.5 18 432 405 69 max. 45 ?1 9 30 81.5 max. 9.2 45 ?1.5 10 845 925 50 x 373 an type 2 cs type 2 373 53 27.1 332 ?3 63 ?1.5 18 432 405 80 max. 51 ?1.5 9 30 92.5 max. 9.2 51 ?1.5 11.5 1270 1350 a ?2 ? b max. ? c min. d e + 0.5 f + 0 ? 4 g ? 0 ? 4 h ? 0 j k l ?0.5 m ?0.5 p ? q r z approx. average an unit weight in g cs dimensions in millimeters type 2 screwed type 1 solded screwed stainless steel 304 l collars ? cs ? type 1 screwed stainless steel 304 l collars ? cs ? type 2 RSSD medium and high power resistors are noted for their ability to withstand heavy transient and severe shock and vibration conditions. they complement the ohmic range of vishay styles rw, rwst and ra in the low value area, and can be tapped by means of adjustable collars. standard RSSD resistors have a single adjustable collar. dimensions RSSD style connection 8 x 34 an type 1 34 10 4.1 27 ?2 20 ?05 5 28 ?1 3.2 16 ?0.5 1 10 10 x 50 an type 1 50 11.5 5 40 ?2 22 ?0.5 6.35 31 ?1 4.2 18 ?0.5 1.5 22 13 x 70 an type 1 cs* 70 14.5 6.7 56 ?2 24 ?0.5 6.35 34 ?1 4.2 20 ?0.5 3.5 38 16 x 94 an type 1 94 18 9.2 78 ?2 26.5 ?0.5 6.35 38 ?1 4.2 21 ?0.5 4 55 20 x 117 an type 1 117 22 12.6 98 ?2 31 ?0.7 6.35 42 ?1 4.2 24 ?0.7 5 80 dimensions in millimeters a ?2 ? b max. ? c min. d e f p ? q r z approx. average unit an weight in g + 0.5 + 0 a zf ? b d ? q r ? c ? c p e p a ? b 26 ? c j k m g h l a ? b 23 58 j k ? c m g h 15 15 l cs collars f
www.vishay.com 71 RSSD vishay sfernice document number: 50020 revision 27- j un-02 for technical questions, contact sfer@vishay.com typical values and drifts 1% 1% 1% 1.5% tests conditions requirements short time overload ? 55 c + 200 c 5 cycles 10pr during 5s load at 100% pr followed by cold ? 55 c/15 ? 90 ? /30 ? cycle 1000h at pr at + 25 c 3% 2% 2% or 0.05 ? 5% climatic sequence load life thermal shock performance additional tappings are supplied with their adjustable collars fastened but not set to any speci c value. please note that, on request, all tapp ings can be adjusted by vishay sfernice. for adjustment purposes we would need to be advised of the ohmic values, and tolerances of the sections in successive order in addition to their sum rn. the permissible maximum value for an adjustment should take into account the possible negative tolerance of rn. please consult vishay sfernice regarding the acceptable tolerance. recommendations for use maximum current strength: the ohmic value and the power decrease as the connections are brought together. to avoid overload, the maximum current strength that is permissible for rn should never be exceeded : i max. = pr/rn adjustable wirewound vitreous resistors low ohmic values special features RSSD type 8 x 34 16w 14w 0.12 ? 10 ? 0 23 10 x 50 25w 22w 0.12 ? 22 ? 1 21 13 x 70 42w 38w 0.12 ? 43 ? 1 14 16 x 94 70w 62w 0.33 ? 75 ? 1 11 20 x 117 100w 90w 0.22 ? 100 ? 1 10 25 x 138 140w 125w 0.10 ? 150 ? 1 8 25 x 168 200w 170w 0.12 ? 220 ? 2 6.5 30 x 250 280w 240w 0.22 ? 360 ? 2 6 40 x 370 450w 360w 0.47 ? 470 ? 4 5.7 50 x 373 600w 450w 0.68 ? 560 ? 4 5.7 power rating continuous at 25 c reduced resistance ohmic range (e12, e24 series) with 1 tapping maximum number of additional tapping reduction % of ohmic value by tapping mechanical specifications mechanical protection vishay sfernice special cement resistive element nickel alloy wire connections an collars cs supporting collars average unit weight 10 to 1350g environmental specifications temperature limits 55 c + 450 c climatic category 55 c/+ 200 c/56 days resistance range 0.12 ? to 560 ? (e12-e24 series) standard resistance r 10 ? 5% tolerance 1 ? r < 10 ? 10% r < 1 ? 20% power rating 14w to 600w at 25 c temperature coef cient + 75ppm/ c (typical) electrical specifications
document number: 50020 revision 27- j un-02 www.vishay.com 72 RSSD vishay sfernice for technical questions, contact sfer@vishay.com temperature rise rated power in watts hot spot temperature in c 400 300 200 100 0 10 100 1000 r s s d 8 x 34 RSSD 10 x 50 RSSD 13 x 70 RSSD 16 x 94 RSSD 20 x 117 RSSD 25 x 138 RSSD 25 x 168 RSSD 30 x 250 RSSD 40 x 370 RSSD 5 0 x 373 power rating chart ambient temperature in degrees celsius % rated power 100 80 60 40 0 0 100 200 300 400 450 model RSSD style special design 10 x 50 method n optional connections an 20 ? custom items are subject to extra charge and min. order. please see price list. tolerance 5% ordering information marking sfernice trademark, model, style, nominal resistance (in ? ), tolerance (in %), manufacturing date. adjustable wirewound vitreous resistors low ohmic values
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