VISHAY DALE, MODELS RH and NH Wirewound Resistors Military, MIL-R-18546 Qualified, Type RE Aluminum Housed, Chassis Mount FEATURES SPECIAL MODIFICATIONS Standard winding (Model RH) Available upon request * Non-inductive winding (Model NH) Special: * Molded construction for total environmental Threaded mounting holes protection Housing configurations Complete welded construction Resistance-temperature characteristic * Mounts on chassis to utilize heat-sink effect Terminal configurations and materials High stability at conventional power ratings Resistances and tolerances Flat marking surface for easy identification Pre-conditioning POWER RATING RESISTANCE RANGE (Ohms) STANDARD TEMP. COEFFICIENT MIL-R- (Watts) MIL. RANGE SHOWN IN BOLD FACE MAX, MAX. VALUE RANGES (Ohms)* DALE | 18546 WORKING | WEIGHT MODEL | TYPE | DALE | MILITARY | +.05%,+.1% | +.25% +5% | 1%,+3%,+5% | VOLTAGE | (Grams) | +50PPM/C | +30PPMTC | +20PPM/C RH-5 7.5 (5) 5-6.75k 1-86k | .05-8.6k 02 - 24.5k 160 3 1-99 10-49 50 - 24.5k REGOG 5 ~ = 10 + 3.32k NHS 7.5 (5) 5-232 | 1-327k | 05-3.27k OS - 12.75k 410 33 1-99 10-25 | 26- 12.25k REGON 5 - - 1.0-1.65k RH-10 ~ | 12.5 (10) 5-12.7%k | 1-16.69k | .05 - 16.69k 01 - 47.1k 265 6 1-99 10-79 80-47.1k RE65G 10 - - - 10 - 5.82k NH-10 | 12.5 (10) 5-445k =| .4-5.54k | 05 -5.54k 05 - 23.5k 190 88 1-99 10- 40 AY - 23.5k REGSN 10 _ - _ 1.0 - 2.8K RH-25 ~ 25 5-25.7k | 1-92.99 | .05 - 32.99k 01 - 95.2k 550 13 1-99 10-169 | 170-95.2k RE70G 20 = - - 10-12.4k NH-25 25 5-9.09k | .1-128k | .05- 128k 05 - 47.6k 390 16.5 1-99 10-85 86 - 47.6% RETON 20 - - - 1.0 - 6.04k RH-50 50 5-73.4k 1-96k | .05- 96k 01 - 273k 1250 28 1-99 10-469 | 470- 273k RE75G 30 - - 10 + 39.2k NH-50 - 50 5 - 26k 4-36.7k | .05-36.7k 05 - 136k 890 36 1-99 10-235 | 236- 136k RE75N 30 - - 1.0- 19.6k RH-100 | 100 5 - 90k 1-90k | 05 - 90k .05 - 90k 1900 400 1-99 100-949 | 950 - 90k RE77G 75 = _ 05 - 29.4k NH-100 | 100 5-37.8k | .1-37.5k | 05 -37.5k 05 - 37.5k 1350 440 1-49 50-475 | 476-375k RETIN 75 - - 1.0- 14.7k RH-250 | 250 5+ 116k 1-116k | .05- 116k 05 - 116k 2300 800 1-99 100-999 | 1k-116 RE@0G 120 = - 10 - 35.7k NH-250 | 250 5-48.5k | .1-48.5k | .05-48.5k 05 - 48.5k 1625 880 1-49 50-499 | 500-48.k RE80N 120 - - - 1.0-17.4k * 4 ohm to .99 ohm = + 100PPM/C. Note: All resistance ranges shown conform to military specifications unless otherwise indicated. Figures in parentheses on RH-5 and RH-10 indicate wattage printed. New construction allows these resistors to be rated at 7.5 and 12.5 watts, but they will be printed with these higher ratings only upon customer request. ELECTRICAL SPECIFICATIONS Dielectric Strength: Resistance Tolerance: + .05%, + .10%, + .25%, + .5%, + 1%, 1000 VAC = 5, 10, 25 watt units. + 3%, + 5%. 2000 VAC = 50 watt units. Operating Temperature: - 55C to + 250C. 4500 VAC = 100, 250 watt units. Derating is required for reduced chassis mounting area and for high ambient temperatures. (See Derating Curve.) Power Rating: Ratings are based on these requirements: Insulation Resistance: 10,000 Megohm minimum dry, 1,000 Megohm minimum after moisture test. 1. + 250C maximum internal hotspot temperature. MECHANICAL SPECIFICATIONS 2.1% max. AR in 1000 hour load life for RH-5 thru RH-50. . 3% max. AR in 1000 hour load life for RH-100 and RH-250. Teun Steet RH-5. NH-5. RH-10, NH-10 3. Proper heat sink: 10 pound pull test = RH-25 thru RH-250, 4x6 x 2 x .040 aluminum chassis = 5 and 10 watt units. 5x 7x2 x .040 aluminum chassis = 25 watt units. NH-25 thru NH-250. 12 x 12 x .059 aluminum panel = 50 watt units. Solderability: Satisfactory when tested in accordance with 12 x 12 x .125 aluminum panel = 100 and 250 watt units. MIL-STD-202, Method 208. 12 DALE ELECTRONICS, INC., 1122 23rd Street, Columbus, NE 68601-3647 * Phone (402) 563-6506 * Fax 402-563-6418ee MODELS RH and NH MATERIAL SPECIFICATIONS Core: Ceramic steatite Element: Copper-nickel alloy, nickel-chrome alloy or manganese copper, depending on resistance value. End Caps: Stainless steel. Encapsulant: Silicone Housing: Aluminum wi Standard Terminals: Tinned Copperweldon 5 thru 50 watt or alumina, depending on physical size. units. Threaded terminals on 100 and 250 watt units. APPLICABLE MIL-SPECIFICATIONS MIL-R-18546: The military specification covering housed chassis-mounted power resistors. Dale RH and NH resistors meet or exceed the electrical, environmental and dimensional requirements of this specification. molded construction. th hard anodic coating. RH-5, -10, -25, -50 A ~__~__D | NH-S5, -10, -25, -50 k > [ A_ M F , } = : _ +E >| 4 i N : 8 = : G | + J { P 4 Ft _ +> >| j~a~ L H K TYPE A B Cc D E F G H J K L M N P RH-5 444 490 .600 1.125 .334 646 .320 065 133 .078 .093 .078 -050 .266 NH-5 + .005 + .005 + .031 + .062 + .015 + .015 + 015 + .010 +.010 +.010 + .005 +.015 + .005 + .062 (11.28 | [12.45 | [15.24 | [2858 | [a.4e | [1641 [8.13 [1.65 | (3.38 | [1.98 | [236 | [1.98 | [1.27 (6.76 +.127] | 4.127] | +.787] | +157) | +.381] | +.981] | 4.981) | +.254) | +.254) | +.254} | 4.127) | +.381] | 4.127] | + 1.57] RH-10 562 625 .750 1.375 420 -800 390 075 165 .093 .094 -102 .085 312 NH-10 + .005 + .005 + .031 + .062 + 015 +.015 + .015 + .010 + .010 + .010 + .005 +.015 + .005 + .062 [14.27 | (15.88 | [19.05 | (34.93 | [10.67 | [20.32 (9.91 [1.90 | [4.19 2.36 | [2399 | [259 | {2.16 (7.92 +127] | +.127] | .787] | +1.57] | +.381] | 4.381) | +.981) | +.254] | +.254) | +.254) | 4.127] | 4.381] | +.127] | +157] RH-25 719 781 1.062 1.938 .550 1.080 546 .075 231 172 125 115 .085 438 NH-25 + .005 + .005 + .031 + .062 +.015 + 015 + .015 + .010 + .010 + .010 t+ .005 + .015 + .005 + .062 [18.26 | [19.84 | [26.97 | [49.23 | [13.97 | [27.43 | [13.87 {1.90 | [5.87 (4.37 | [3.18 [2.92 | [2.16 | [11.13 +127] | +.127] | 4.787} | + 1.57) | 4.381) | 4.381] | +.381] | +.254) | 4.254] | +.254) | +.127) | +.384] | +.127) | + 1.57] RH-50 1.562 .844 1.968 2.781 .630 1.140 -610 .088 .260 .196 125 107 .085 .438 NH-50 | +.005 | +.005 | +.031 | +.062 | +.015 | +.015 | +.015 | +.010 | +.010 | +.010 | +.005 | +.015 | +.005 | +.062 (39.67 | [21.44 | [49.99 | [70.64 | [16.00 | [28.96 | [15.49 (2.24 | [660 | [498 | [3.18 [2.72 | [246 | [11.13 +.127) | 4.127] | +.787) | 1.57] | +.381] | +.981] | +.381] | +.254] | +254) | +.254] | +.127) | +.384) | +.127] | 1.57] RH-100, NH-100 188 +.010 (4.78 +254] Nickel Plated _ Brass Nut 3.50 + .031 Dia. Typ. [48.02 ian Stainless Steel Stud [88.90 + .787} 1.125 +.031 A+| 128.58 4.787) 2.812+.031 __ | 2.25 +.010 1.75 + .031 (71.42 +.787] fac raft (87.15 + 254] r (44.45 + .787} / & a75t.031 | le 1 +.031 956 4 381 375+, 989 + | 188 +.031 [19.56 +.381} . i > po tee +.787) (25.12 +.787] (470.707 - .75+.010 yp. UNC-2A || 169.85 +254) ~ . Thd. Typ. ' * 5.478 + .093 (139.14 + 2.36] RH-250, NH-250 188-+.010 (4.78 +.254) Dia. Typ. V4 - 20 Nickel Plated UNC-2A Thd.Typ. 2.125 + .031 Brass Nut 4.50 + 031 [53.98 +.787] Stainless Steel Stud (114.30 + .787] 1,25 +.031 <____ > I-48 Thy [31.75 + .787) | = f ra, 3.0 +.031 { 2.50+.010 2.188 + .031 [76.20 + .787] mallee [63.50 + .254] ~ YF (55.58 +.767] 7 | @ +t +O 1.25 +.031 (31.75 +.787] ____L r3 1 875 +.010 4 <> <> [22.23 +.254] .250 + .031 ~ 30+.010 > [6.35 + .787] [76.20 + .254} Typ. ~< 3.875+.010 (98.42 + .254] N\ 955 + .015 [24.26 + .381] y 7.0 + .093 [177.80 + 2.36] DALE ELE CTRONICS, INC., 1122 23rd Street, Columbus, NE 68601-3647 * Phone (402) 563-6506 Fax 402-563-6418 134 moor trae gs 4 et General: Testing is done acco rding to the procedures and test methods described requirements and the Dale performance. All specifications are based on testing of + 1% tolerance units. ae eer eee in MIL-R-18546. The table below shows the military TEST MIL-R-18546 REQUIREMENT TYPICAL CHANGE Temperature Coefficient + SOPPM/C 200022 See Table + 30PPM/C over 200002 Thermal Shock + (.5% + 0.0122) AR + (.25% + 0.019) AR Short Time Overload + (.5% + 0.0102) AR + (.25% + 0.012) AR Dielectric + (2% + 0.010) AR t (1% + 0,019) AR High Temperature Storage + (.5% + 0.0192) AR + (.25% + 0.012) AR Moisture Resistance + (1% + 0.0122) AR + (.5% + 0.01) AR Shock + (.2% + 0.0122) AR + (.1% + 0.012) AR Load Life + (1% + 0.0192) AR + (.5% + 0.019) AR Vibration + (.2% + 0.0102) AR + (.1% + 0.019) AR Terminal Strength t (2% + 0.0122) AR + (.1% +0.019) AR The following curves apply to operation af unmounted resistors: A=5 &10 watt units, unmounted. B = 25 watt units, unmounted. Cc = 50, 100 & 250 watt units, unmounted. D = All types mounted to aluminum chassis. See Packaging Methods, Wirewound Resistors at the back of the catalog. RH-50 MODEL 1022 VALUE DALE: MILITARY: Dale Dale 12 #100 Model Model 5 a 80 Value and tolerance Value and tolerance w 60 Ee Wattage Wattage = 40 9 9 5S 20 Date code MIL mark ee 0 Date co 50 100 150 200 250 300 350 code AMBIENT TEMP. DEG. CENTIGRADE HOW TO ORDER +1% TOLERANCE 14 DALE ELECTRONICS, INC., 1122 23rd Street, Columbus, NE 68601-3647 * Phone (402) 563-6506 Fax 402-563-6418