rh, nh vishay dale www.vishay.com 122 document number 30201 revision 18-feb-03 for technical questions, contact ww2bresistors@vishay .com features ? molded construction for total environmental protection ? complete welded construction ? meets applicable requirements of mil-prf-18546 ? available in non-inductive styles (type nh) with aryton- perry winding for lowest reactive components ? mounts on chassis to utilize heat-sink effect ? excellent stability in operation wirewound resistors, military, mil-prf-18546 qualified, type re, aluminum housed, chassis mount note: figures in parentheses on rh-5 and rh-10 indicate wattage printed on parts, new construction allows these resistors to be rated at higher wattage but will only be printed with the higher wattage on customer request. ordering information rh-50 10 ? 1.0% model resistance tolerance ? % resistance range mil. range shown in bold face standard electrical specifications model rh-5 nh-5 rh-10 nh-10 rh-25 nh-25 rh-50 nh-50 rh-100 nh-100 rh-250 nh-250 mil-prf- 18546 type re60g re60n re65g re65n re70g re70n re75g re75n re77g re77n re80g re80n dale 7.5 (5) 7.5 (5) 12.5 (10) 12.5 (10) 25 25 50 50 100 100 250 250 military 5 5 10 10 20 20 30 30 75 75 120 120 0.05%, 0.1% 0.5 - 6.75k 0.5 - 2.32k 0.5 - 12.7k 0.5 - 4.45k 0.5 - 25.7k 0.5 - 9.09k 0.5 - 73.4k 0.5 - 26k 0.5 - 90k 0.5 - 37.5k 0.5 - 116k 0.5 - 48.5k 0.25% 0.1 - 8.6k 0.1 - 3.27k 0.1 - 16.69k 0.1 - 5.54k 0.1 - 32.99k 0.1 - 12.8k 0.1 - 96k 0.1 - 36.7k 0.1 - 90k 0.1 - 37.5k 0.1 - 116k 0.1 - 48.5k 0.5% 0.05 - 8.6k 0.05 - 3.27k 0.05 - 16.69k 0.05 - 5.54k 0.05 - 32.99k 0.05 - 12.8k 0.05 - 96k 0.05 - 36.7k 0.05 - 90k 0.05 - 37.5k 0.05 - 116k 0.05 - 48.5k 1%, 3%, 5% 0.02 - 24.5k 0.10 - 3.32k 0.05 - 12.75k 1.0 - 1.65k 0.01 - 47.1k 0.10 - 5.62k 0.05 - 23.5k 1.0 - 2.8k 0.01 - 95.2k 0.10 - 12.1k 0.05 - 47.6k 1.0 - 6.04k 0.01 - 273k 0 .10 - 39.2k 0.05 - 136k 1.0 - 19.6k 0.05 - 90k 0.05 - 29.4k 0.05 - 37.5k 1.0 - 14.7k 0.05 - 116k 0.10 - 35.7k 0.05 - 48.5k 1.0 - 17.4k weight (typical) g 3 3.3 6 8.8 13 16.5 28 35 350 385 630 690 power rating p 25 c w ?
www.vishay.com 123 rh, nh vishay dale document number 30201 revision 18-feb-03 for technical questions, contact ww2bresistors@vishay .com dimensions wirewound resistors, military, mil-prf-18546 qualified, type re, aluminum housed, chassis mount model dimensions in inches [millimeters] abc de fghjklmnp rh-5 0.444 0.490 0.600 1.125 0.334 0.646 0.320 0.065 0.133 0.078 0.093 0.078 0.050 0.266 nh-5 0.005 0.005 0.031 0.062 0.015 0.015 0.015 0.010 0.010 0.010 0.005 0.015 0.005 0.062 [11.28 [12.45 [15.24 [28.58 [8.48 [16.41 [8.13 [1.65 [3.38 [1.98 [2.36 [1.98 [1.27 [6.76 0.127] 0.127] 0.787] 1.57] 0.381] .381] 0.381] 0.254] 0.254] 0.254] 0.127] .381] 0.127] 1.57] rh-10 0.562 0.625 0.750 1.375 0.420 0.800 0.390 0.075 0.165 0.093 0.094 0.102 0.085 0.312 nh-10 0.005 0.005 0.031 0.062 0.015 0.015 0.015 0.010 0.010 0.010 0.005 0.015 0.005 0.062 [14.27 [15.88 [19.05 [34.93 [10.67 [20.32 [9.91 [1.91 [4.19 [2.36 [2.39 [2.59 [2.16 [7.92 0.127] 0.127] 0.787] 1.57] 0.381] 0.381] 0.381] 0.254] 0.254] 0.254] 0.127] 0.381] 0.127] 1.57] rh-25 0.719 0.781 1.062 1.938 0.550 1.080 0.546 0.075 0.231 0.172 0.125 0.115 0.085 0.438 nh-25 0.005 0.005 0.031 0.062 0.015 0.015 0.015 0.010 0.010 0.010 0.005 0.015 0.005 0.062 [18.26 [19.84 [26.97 [49.23 [13.97 [27.43 [13.87 [1.91 [5.87 [4.37 [3.18 [2.92 [2.16 [11.13 0.127] 0.127] 0.787] 1.57] .381] 0.381] 0.381] 0.254] 0.254] 0.254] 0.127] 0.381] 0.127] 1.57] rh-50 1.562 0.844 1.968 2.781 0.630 1.140 0.610 0.088 0.260 0.196 0.125 0.107 0.085 0.438 nh-50 0.005 0.005 0.031 0.062 0.015 0.015 0.015 0.010 0.010 0.010 0.005 0.015 0.005 0.062 [39.67 [21.44 [49.99 [70.64 [16.00 [28.96 [15.49 [2.24 [6.60 [4.98 [3.18 [2.72 [2.16 [11.13 0.127] 0.127] 0.787] 1.57] 0.381] 0.381] 0.381] 0.254] 0.254] 0.254] 0.127] 0.381] 0.127] 1.57] rh-250, nh-250 rh-100, nh-100 2.25 0.010 [57.15 0.254] 0.989 0.031 [25.12 0.787] 2.812 0.031 [71.42 0.787] 3.50 0.031 [88.90 0 .787] nickel plated brass nut stainless steel stud 1.125 0.031 [28.58 0.787] 0.188 0.010 [4.78 0.254] dia. typ. 12 - 24 unc-2a thd. typ. 2.75 0.010 [69.85 0.254] .375 0.031 [9.52 0.787] 5.478 0.093 [139.14 2.36] 1.75 0.031 [44.45 0.787] 2.188 0.031 [55.58 0.787] 2.125 0.031 [53.98 0.787] 0.250 0.031 [6.35 0.787] typ. 4.50 0.031 [114.30 0.787] 2.50 0.010 [63.50 0.254] nickel plated brass nut stainless steel stud 7.0 .093 [177.80 2.36] 0.875 0.010 [22.23 .254] 3.0 0.010 [76.20 .254] 3.875 0.010 [98.42 0.254] 0.770 0.015 [19.56 0.381] 0.188 0.031 [4.78 0.787] typ. 1.812 0.031 [46.02 0.787] .312 0.031 [7.92 0.787] 1.25 0.062 [31.75 1.575] 1.25 0.062 [31.75 1.575] 1/4 - 20 unc-2a thd.typ. 0.188 0.010 [4.78 0.254] dia. typ. 0.955 0.015 [24.26 .381] rh-5, -10, -25, -50 nh-5, -10, -25, -50 p d c a l m n j f e h g k b 3.0 .031 [76.20 0.787]
rh, nh vishay dale www.vishay.com 124 document number 30201 revision 18-feb-03 for technical questions, contact ww2bresistors@vishay .com wirewound resistors, military, mil-prf-18546 qualified, type re, aluminum housed, chassis mount power rating vishay rh resistor wattage ratings are based on mounting to the following heat sink: rh-5 and rh-10: 4" x 6" x 2" x 0.040" thick aluminum chassis (129 sq. in. surface area) rh-25: 5" x 7" x 2" x 0.040" thick aluminum chassis (167 sq. in. surface area) rh-50: 12" x 12" x 0.059" thick aluminum panel (291 sq. in. surface area) rh-100 and rh-250: 12" x 12" x 0.125" thick aluminum panel (294 sq. in. surface area) ambient temperature derating derating is required for ambient temperatures above 25 c, see the following graph. curves a, b, c apply to operation of unmounted resistors. curve d applies to all types when mounted to specified heat sink. a = rh-5 and rh-10 size resistor, unmounted b = rh-25 size resistor, unmounted c = rh-50, rh-100 and rh-250 size resistor, unmounted d = all types mounted to recommended aluminum heat sink rated power in % derating reduced heat sink derating: derating is also required when recommended heat sink area is reduced. a = rh-5 and rh-10 size resistor b = rh-25 size resistor c = rh-50, rh-100 and rh-250 size resistor 100 90 80 70 60 50 40 30 20 10 0 0 20 40 60 80 100 % of recommended heat sink area rated power in % heat sink derating a c b -55 -50 0 50 150 250 ambient temperature in c 25 120 a c d b 0 20 40 60 80 100 parameter unit rh resistor characteristics temperature coefficient ppm/ c 100 for 0.1 ? to 0.99 ? , 50 for 1 ? to 9.9 ? , 20 for 10 ? and above dielectric withstanding voltage v ac 1000 for rh-5, rh-10 and rh-25, 2000 for rh-50, 4500 for rh-100 and rh-250 short time overload - 5 x rated power for 5 seconds maximum working voltage v (p x r) 1/2 insulation resistance ? 10,000 megohm minimum dry, 1000 megohm minimum after moisture test terminal strength lb 5 minimum for rh-5 and rh-10, 10 minimum for all others solderability - mil-prf-18546 type - meets requirements of ansi j-std-002 operatingtemperature range c - 55/+ 250 technical specifications
www.vishay.com 125 rh, nh vishay dale document number 30201 revision 18-feb-03 for technical questions, contact ww2bresistors@vishay .com wirewound resistors, military, mil-prf-18546 qualified, type re, aluminum housed, chassis mount material specifications element: copper-nickel alloy or nickel-chrome alloy, depending on resistance value core: ceramic, steatite or alumina, depending on physical size encapsulant: silicone molded construction housing: aluminum with hard anodic coating end caps: stainless steel standard terminals: tinned copperweld ? on rh-5 through rh-50 size, threaded stainless steel terminals on rh-100 and rh-250 part marking: dale, model, wattage, value, tolerance, date code nh non-inductive models of equivalent physical and electrical specifications are available with non-inductive (aryton-perry) winding. they are identified by substituting the letter n for r in the model number (nh-5, for example). special modifications a number of special modifications to the aluminum housed resistor style are available upon request. special modifications include: ? terminal configurations and materials ? resistance values and tolerances ? low resistance temperature coefficient (rtc) ? housing configuration ? threaded mounting holes ? preconditioning and other additional testing applicable mil specifications mil-prf-18546 is the military specification covering aluminum housed, chassis mount, power resistors. vishay rh and nh resistors are listed as qualified on the mil-prf-18546 qpl. performance test conditions of test test limits thermal shock rated power applied until thermally stable, then a minimum of 15 minutes at - 55 c (0.5% + 0.05 ? ) ? r short time overload 5 x rated power for 5 seconds (0.5% + 0.05 ? ) ? r 1000vrms for rh-5, rh-10 and rh-25; 2000vrms for rh-50 4500vrms for rh-100 and rh-250; duration one minute temperature 250 c for 2 hours (0.5% + 0.05 ? ) ? r moisture resistance mil-std-202 method 106, 7b not applicable (1.0% + 0.05 ? ) ? r shock, specified pulse mil-std-202 method 213, 100g's for 6 miliseconds, 10 shocks (0.2% + 0.05 ? ) ? r vibration, high frequency frequency varied 10 to 2000hz, 20g peak, 2 directions 6 hours each (0.2% + 0.05 ? ) ? r load life 1000 hours at rated power, + 25 c, 1.5 hours on, 0.5 hours off (1.0% + 0.05 ? ) ? r 30 second, 5 pound pull test for rh-5 and rh-10, 10 pound pull test for other sizes, torque test - 24 pound inch for rh-100 and 32 pound inch for rh-250 dielectric withstanding voltage (0.2% + 0.05 ? ) ? r terminal strength (0.2% + 0.05 ? ) ? r
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