HS/HSN Series The Ward Leonard brand, HS/HSN Series, complements Ohmite's Military grade 89 Series as a lower cost alternative. The HS/HSN Series offers the added feature of larger sizes (100 and 250 watts) not available in the 89 Series. HS/HSN Series maintains the same construction, materials, and manufacturing techniques as the Mil-R-18546 approved 89 Series. As a made-to-order product, it is recommended for higher volume applications. Aluminum Housed Axial Lead Wirewound Resistors Industrial/Commercial Grade 25 & 50 watt D C A G N I H E BF L FEATURES K M J 100 & 250 watt G I H N M E BF L J Series HS25 HSN25 HS50 HSN50 HS100 HSN100 HS250 HSN250 K Power Rating (Watts) 25 25 50 50 100 100 250 250 nickel-plated brass nut, stainless steel stud Resistance Range (Ohms) .10 - 12.1K .005 - 6.04K .10 - 39.2K .005 - 19.6K .05 - 29.4K 1.0 - 14.7K .10 - 35.7K 1.0 - 17.4K Max. Working Voltage 550 390 1250 890 1900 1350 2300 1625 Housing: Aluminum with hard anodic coating. Internal Coating: Silicone. Core: Ceramic. Terminals: Solder-coated axial lead. Derating: Linearly from 100% @ +25C to 0% @ +275C. Electrical Tolerance: 1% and 5% (other tolerances available). Power rating: Rating is based on chassis mounting area and temperature stability. Proper heat sink as follows: 25W units, 5" x 7" x 2" x .040" Aluminum chassis; 50W units, 12" x 12" x .059" Aluminum panel; 100 and 250W units, 12" x 12" x .125 Aluminum panel. Maximum ohmic values: See chart. Overload: 5 times rated wattage for 5 seconds. Temperature coefficient: Under 1: 90 ppm/C 1 to 9.99: 50 ppm/C 10 and over: 30 ppm/C. Dielectric withstanding voltage: 25W, 1000VAC; 50W, 2000VAC; 100W and 250W, 4500VAC. DERATING CURVE 100 80 Percent Rated Watts D C A * Standard winding (Model HS) * Non-inductive winding (Model HSN) * Molded construction for total environmental protection * Complete welded construction * Mounts on chassis to utilize heat-sink effect * High stability at conventional power ratings * Flat marking surface for easy identification SPECIFICATIONS Material All types, mounted to aluminum chassis 60 25 watt 40 50, 100 & 250 watt 20 0 0 25 50 75 100 125 150 175 200 225 250 275 Ambient Temperature, C DIMENSIONS in. (mm) Dim. A Dim. B Dim. C Dim. D Dim. E Dim. F Dim. G Dim. H Dim. I Dim. J Dim. K Dim. L Dim. M Dim. N HS25 / HSN25 25 watt (upper figure) 0.719 .005 (18.26 .127) 0.781 .005 (19.84 .127) 1.062 .031 (26.97 .787) 1.938 .062 (49.23 1.57) 0.550 .015 (13.97 .381) 1.080 .015 (27.43 .381) 0.546 .015 (13.87 .381) 0.075 .010 (1.90 .254) 0.231 .010 (5.87 .254) 0.172 .010 (4.37 .254) 0.125 .005 (3.18 .127) 0.115 .015 (2.92 .381) 0.085 .005 (2.16 .127) .438 .062 (11.13 1.57) HS50 / HSN50 50 watt (upper figure) 1.562 .005 (39.67 .127) 0.844 .005 (21.44 .127) 1.968 .031 (49.99 .787) 2.781 .062 (70.64 1.57) .630 .015 (16.00 .381) 1.140 .015 (28.96 .381) 0.610 .015 (15.49 .381) 0.088 .010 (2.24 .254) 0.260 .010 (6.60 .254) 0.196 .010 (4.98 .254) 0.125 .005 (3.18 .127) 0.107 .015 (2.72 .381) 0.085 .005 (2.16 .127) 0.438 .062 (11.13 1.57) HS100 / HSN100 HS250 / HSN250 100 watt 250 watt (lower figure) (lower figure) 2.75 .010 (69.85 .254) 3.875 .010 (98.425 .254) 2.25 .010 (57.15 .254) 2.5 .010 (63.50 .254) 3.50 .031 (88.90 .787) 4.5 .031 (114.30 .787) 5.478 .093 (139.14 2.36) 7.0 .093 (117.80 2.36) 1.812 .031 (46.02 .787) 2.125 .031 (53.98 .787) 2.812 .031 (71.42 .787) 3.0 .031 (76.20 .787) 1.75 .031 (44.45 .787) 2.188 .031 (55.58 .787) 1.88 .031 (4.78 .787) 0.250 .031 (6.35 .787) .770 .015 (19.56 .381) 0.955 .015 (24.26 .381) .375 .031 (9.52 .787) 0.312 .031 (7.92 .787) .188 .010 (4.78 .254) 0.188 .010 (4.78 .254) .219 .031 (5.56 .787) 0.25 .031 (6.35 .787) 12 - 24 UNC - 2A THD 1/4 - 20 UNC - 2A THD .989 .031 (25.12 .787) 1.25 .031 (31.75 .787) 18 Ohmite Mfg. Co. 1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 * Tel. 1-866-9-OHMITE * Fax 1-847-574-7522 * www.ohmite.com * info@ohmite.com