document number: 50013 revision 27- j un-02 www.vishay.com 52 RH vishay sfernice for technical questions, contact sfer@vishay.com features 5 watt to 50 watt at 25c mil-r 18546 d and 1c nf c 83-210 cecc 40 203 high stability < 0.05% year electrical insulation low temperature coef? cient wide range of values d a n m f ? 2 ? k ? p e q l g h b j heatsink encased wirewound power resistors 28.5 1.5 12.5 11.3 16.3 6.8 1.5 8.5 6.2 16.4 2.4 8.9 4.3 1.6 2.1 25.3 1.5 3 35 1.5 15.9 14 19 7.9 1.5 11 7.9 20.6 2.4 11 5.6 2 2.1 30.6 1.5 8.8 49 1.3 19.8 18.3 28 11.1 1.5 14 9.9 27.5 3.2 15 8 2.4 2.1 44.6 1.3 16.5 70.2 1.4 21.4 39.7 50 11 1.2 15.5 10.7 29.4 3.2 15 8 2.4 2.1 66.5 1.4 30.8 model and style a b 0.2 d 0.2 e 0.5 f g 1 h 0.7 j 0.5 ? k 0.1 l max. m 0.5 n 0.3 ? p min. q weight in g RH5 RH10 RH25 RH50 mil-r-18546 d and 1c vishay sfernice model and style nf c 83-210 (cecc 40 203) power rating chassis mounted resistors 413 cm 2 for RH5 and RH10 536 cm 2 for RH25 and RH50 unmounted resistors rated maximum voltage (vrms) dielectric strength (rms) ohmic range vishay sfernice qualified ohmic range nf c 83-210 minimum ohmic values in relation to tolerance 25c 70c 25c 70c 25c 70c mil limits vishay sfernice limits vishay sfernice limits e 96 e 96 e 96 e 48 e 24 e 12 0.1% 0.5% 1% 2% 5% 10% RH5 re4 re60 5w 4w 10w 8w 1000v 0.01 ? 12k ? 0.1 ? 2.7k ? 1 ? 0.1 ? 0.1 ? 0.01 ? 0.01 ? 0.1 ? 0.05 ? 0.01 ? 0.01 ? 0.006 ? 0.01 ? 0.008 ? 1 ? 4w 3.2w 160v re1 re65 10w 8w 12.5w 10w 1500v 0.006 ? 20k ? 0.1 ? 4.99k ? 6w 4.8w 250v re2 re70 20w 16w 25w 20w 2500v 0.006 ? 62k ? 9w 7.2w 550v re3 re75 30w 24w 50w 40w 2500v 0.006 ? 130 k ? 0.1 ? 33.2k ? 0.1 ? 11.8k ? 12w 9.6w 1285v RH10 RH25 RH50 undergoes european quality insurance system (cecc) electrical specifications RH encased in a compact and light heatsink offering complete environmental protection, great mechanical strength and easy mounting. non inductive versions can be supplied under the RHni designation (please indicate required speci ? cations and frequency range upon ordering). dimensions in millimeters
www.vishay.com 53 RH vishay sfernice document number: 50013 revision 27- j un-02 for technical questions, contact sfer@vishay.com tests operating temperature range momentary overload climatic sequence load life test at high temperature humidity (steady state) resistance to moisture temperature coefficient load life at maximum temperature ? 55 c + 200 c ? (0.25% + 0.05 ? ) (0.25% + 0.05 ? ) (1% + 0.05 ? ) ins. resistance 1g ? (1% + 0.05) ins. resistance 100m ? (1% + 0.05 ? ) 50ppm/ c 25ppm/ c (1% + 0.05 ? ) ins. resistance 1g ? ? (0.1% + 0.05 ? ) (0.1% + 0.05 ? ) (0.1% + 0.05 ? ) (0.5% + 0.05 ? ) (0.5% + 0.05 ? ) 15ppm/ c (0.1% + 0.05 ? ) (0.5% + 0.05 ? ) 5pr/5s ? 55 c + 200 c 5 cycles 2h at + 275 c 56 days climatic sequences test, with load and polarisation 5 to 10 ? > 10 ? 1000h 25 c pn mil vishay 200 c 30% of pn sfernice conditions mil-r-18546 d nf c 83-210 requirements typical drifts momentary overload 1. momentary overload (> 2s): see example in table below. in all cases, it should be understood that: - the 12pn overload applies only to ohmic values 0.1 ? . - the overload voltage shall not be higher than that used for the dielectric strength test (see standard electrical speci ? cations). 2. short time overload (< 2s): for times shorter than 2 seconds, higher overloads can be sustained in some cases. consult vishay sfernice. performance heatsink encased wirewound power resistors power loading 2.5 pn 5 pn 12 pn duration 10 s 5 s 2 s power rating chart ambient temperature in c % rated power 100 75 50 25 0 0 50 100 150 200 250 275 300 350 temperature rise rated power in watts (mounted on heatsink chassis) hot spot temperature in c 200 150 100 50 0 0 10 20 30 40 50 60 70 RH 10 RH 5 RH 25 RH 50 25 style model RH tolerance 5% special design method n optional non inductive winding ni optional ordering information ohmic value 150k ? custom items are subject to extra-charge and min. order. please see price list. marking vishay sfernice trademark, model, style, cecc style (if applicable) nominal resistance (in ? ), tolerance (in %), manufacturing date.
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