Rheostats Model E (Potentiometers) Wirewound Mounting: Panels to 0.125” (3.18mm) thick with 0.25-32 bushing and hex 0.25" 6.4 mm nut (0.063” thick). D 0.125" 3.18 mm 0.25" 6.4 mm B 0.625" 0.625" 15.88 mm 15.88 mm Standard shaft 0.5" 12.7 mm 0.031" 0.79 mm 0.25" 6.35 mm Mounting: Panels to 1.25” (31.75mm) thick with 0.25-20 flat-head screws. 0.375" 9.53 mm C 0.344" 8.73 mm holes for: no. 2 screws (model H) no. 8 screws (J, G, K, L) mounting bracket on model L only 0.063" 1.59 mm B 0.875" 22.23 mm standard shaft (models H, J, G, K, L) D B Models P, N, R, U M 2" 51 mm B M 0.375" 9.53 mm D holes for no. 8 screws 0.25 - 20 thread for mounting screws C 1.563" 39.7 mm O R D E R I N G I N F O R M AT I O N shaft locking nut locking shaft (only model H stocked) Dimensions for reference only; consult factory for details. Models H, J, K, L and N are listed under UL Reexamination Service File No. E-10946 and CSA File No. 21309 unless noted otherwise. 0.406" 10.32 mm 0.031" 0.79 mm Mounting: Panels to 0.25” (6.35mm) thick with 0.375-32 bushing and hex nut (0.094” thick) (or with 10-32 x 0.75 F.H. screws for model L only). Since all rheostats/potentiometers are electro-mechanical devices, they are subject to mechanical wear and, therefore, have a finite life. locking shaft 0.078" 1.98 mm 0.75" 19.05 mm bushing projection 0.625" 15.88 mm 0.031" 0.79 mm drill 0.188" (4.76 mm) hole in panel Dimension “M” 0.875” 22.23 mm 1.188” 30.16 mm 1.5” 38.1 mm 3” 76.2 mm P N R U Models H, J, G, K, L D C 0.094" 2.38 mm 0.109" 2.78 mm 1.75" 44.5 mm 0.531" shaft 13.49 mm locking nut B 0.125" 3.18 mm standard shaft 0.25" 6.35 mm Mounting: Panels to 0.125” (3.18mm) thick enclosed with 0.25-32 bushing and hex nut (0.063” thick). Locking shaft 0.25" 6.4 mm 0.625" 15.88 mm 0.25" 6.35 mm 0.531" 13.49 mm Model C unenclosed D See page 93 for knobs, dials, and other hardware Series Rheostats Wirewound Potentiometers E = RoHS compliant RCSR50E Code Watts Model Shaft Core CL = 7.5 C Locking Enclosed CS = 7.5 C Standard Enclosed EE = 12.5 E Standard Enclosed EL = 12.5 E Locking Open ES = 12.5 E Standard Open GS = 75 G Standard Open HL = 25 H Locking Open HS = 25 H Standard Open JS = 50 J Standard Open KS = 100 K Standard Open LS = 150 L Standard Open NS = 300 N Standard Open PS = 225 P Standard Open RS = 500 R Standard Open US = 1000 U Standard Open Resistance Value* Example: R50 = 0.50Ω 1R0 = 1Ω 7R5 = 7.5Ω 250 = 250Ω 1K0 = 1,000Ω 1K75 = 1,750Ω 4K5 = 4,500Ω 50K = 50,000Ω *Check Table for Standard Resistance Values and Maximum Current Values All rheostats are 10% tolerance. Model Type E RES/REL H RHS/RHL J RJS G RGS K RKS L RLS P RPS N RNS R RRS U RUS C RCS/RCL E REE Watts 12.5 25 50 75 100 150 225 300 500 1000 7.5 12.5 Ohmic range 1.0-15K 1.0-25K 0.5-50K 0.5-50K 0.5-50K 0.5-50K 1.0-30K 1.0-50K 1.0-20K 1.0-20K 10.0-5K 1.0-15K Max. Voltage Core (RMS)* open 305 open 500 open 750 open 900 open 1000 open 1200 open 1300 open 1225 open 1450 open 1600 enclosed 305 enclosed 305 • Models H, J, G, and K also available in enclosed versions. • See Catalog #203 for complete details. Behind panel “B” (In./mm) 0.688/17.46 1.375/34.93 1.375/34.93 1.750/44.45 1.750/44.45 2.000 / 50.8 2.125/53.98 2.375/60.33 2.125/53.98 3.000 / 76.2 0.875/22.23 1.219/30.96 Diameter “D” (In./mm) 0.875/ 22.23 1.560/ 39.62 2.31 / 58.67 2.75 / 69.25 3.125/ 79.38 4.00 /101.60 5.00 /127.00 6.00 /152.40 8.00 /203.20 12.00 /304.80 0.515/ 13.08 1.047/ 26.59 Dimension “C” (In./mm) 0.594/15.08 0.940/23.88 1.56 /39.62 1.78 /45.21 1.91 /48.51 2.28 /57.91 2.97 /75.44 3.44 /87.38 4.31/109.47 6.38/162.05 — — • RoHS compliant product available. Add “E” suffix to part number to specify. • Made-to-order rheostats available: Contact nearest Ohmite sales office. * Voltage rating dependent on resistance value. Shaft torque 1-6 oz. in. 0.25-0.5 lb. in. 0.25-2 lb. in. 0.5-2 lb. in. 0.5-2 lb. in. 0.5-3 lb. in. 2.5-4 lb. in. 2.5-5 lb. in. 4.5-7 lb. in. 3.5-7 lb. in. 0.25-3 oz. in. 1-6 oz. in. Rotation (±5°) 300° 300° 300° 300° 300° 300° 310° 320° 325° 335° 300° 300° S tandard p art n u m b ers for R h eostats 10.0 7.07 12.3 8.66 14.1 10 17.3 12.3 15.0 17.32 2.50 2.24 2.04 3.54 5.00 6.12 7.07 8.65 10.6 12.24 5.00 5.75 7.07 3.88 4.47 5.48 8.66 7.50 6.71 10.00 8.66 7.75 3.16 3.65 4.47 5.49 6.32 2.74 3.16 3.88 4.74 5.48 3.163 3.87 4.47 2.88 1.58 1.44 2.04 2.88 1.25 1.12 1.77 1.58 2.50 1000W Model U Amps max. 5.00 500W Model R RUS––– RNS––– Amps max. RPS––– 300W Model N 3.53 3.53 0.86 225W Model P Amps max. Amps max. 150W Model L RLS––– Amps max. 100W Model K RKS––– RGS––– 75W Model G Amps max. Amps max. 50W Model J RJS––– Amps max. RHL––– Locking RHS––– Std. shaft Amps max. REE––– Enclosed RES––– Std. shaft REL––– Locking Amps max. RCL––– Locking 25W Model H Amps max. –––R50 –––1R0 –––1R5 –––2R0 –––2R5 –––3R0 –––4R0 –––5R0 –––6R0 –––7R5 –––8R0 –––10R –––12R –––12R5 –––15R –––16R –––22R –––25R –––35R –––40R –––50R –––75R –––80R –––100 –––125 –––150 –––160 –––175 –––200 –––225 –––250 –––300 –––325 –––350 –––400 –––500 –––600 –––700 –––750 –––800 –––900 –––1K0 –––1K2 –––1K25 –––1K5 –––1K6 –––1K75 –––1K8 –––2K0 –––2K25 –––2K5 –––3K0 –––3K5 –––4K5 –––5K0 –––7K5 –––8K0 –––10K –––12K5 –––15K –––20K –––25K –––30K –––40K –––50K 12.5W Model E RRS––– 0.5 1 1.5 2 2.5 3 4 5 6 7.5 8 10 12 12.5 15 16 22 25 35 40 50 75 80 100 125 150 160 175 200 225 250 300 325 350 400 500 600 700 750 800 900 1000 1200 1250 1500 1600 1750 1800 2000 2250 2500 3000 3500 4500 5000 7500 8000 10000 12500 15000 20000 25000 30000 40000 50000 RCS––– Std. shaft Part No. Prefix Suffix Ohmic value 7.5W Model C 22.3 18.2 15.8 14.1 12.9 11.2 10.0 31.6 25.8 22.4 20.0 18.3 15.8 14.1 7.90 11.2 10.0 6.30 8.95 5.60 7.90 4.47 6.33 2.04 0.71 0.91 1.29 1.76 1.50 0.55 0.46 0.71 0.60 1.00 0.845 0.39 0.32 0.50 0.40 0.707 0.575 0.27 0.500 0.445 0.22 0.36 0.32 0.29 0.27 0.25 0.375 0.19 0.17 0.22 0.316 2.17 2.50 1.73 2.0 2.450 2.070 3.00 3.46 1.23 1.00 1.41 1.15 1.735 1.415 2.12 1.73 2.45 2.00 0.866 1.00 1.225 1.50 1.73 1.19 1.00 0.790 3.54 3.16 2.52 0.630 0.575 3.16 2.00 1.000 1.22 1.41 0.865 1.06 1.22 1.69 0.612 0.707 0.470 2.39 2.11 0.775 0.408 4.47 3.65 0.500 0.575 1.41 0.866 1.00 1.83 1.24 0.15 0.19 0.267 0.12 0.16 0.222 0.10 0.13 0.182 0.655 0.316 0.433 0.388 0.500 0.447 0.548 0.750 0.316 0.365 0.447 0.274 0.316 0.567 0.866 1.00 1.48 1.41 0.817 1.15 0.707 1.00 0.577 0.816 0.655 0.250 0.086 0.10 0.155 0.224 0.500 0.578 0.433 0.500 0.387 0.447 0.358 0.414 0.336 0.387 0.500 0.300 0.346 0.447 0.346 0.071 0.090 0.129 0.224 0.258 0.176 0.288 0.194 0.224 0.259 0.055 0.070 0.100 0.141 0.173 0.200 0.633 0.224 0.046 0.060 0.084 0.119 0.039 0.050 0.041 0.070 0.058 0.100 0.035 0.031 0.029 0.050 0.182 0.041 0.035 0.032 0.079 0.070 0.058 0.050 0.045 0.041 0.035 0.032 0.123 0.100 0.141 0.115 0.141 0.087 0.100 0.122 = Standard values; check availability Rheostats are silicone-ceramic coated at and above the following ohmic values: Model C: all Model G: 5000Ω Model E: 750Ω Model K: 5000Ω Model H: 2000Ω Model L: 7500Ω Model J: 5000Ω Check product availability at www.ohmite.com