RA Vishay Sfernice Adjustable Wirewound Enamelled Resistors FEATURES * 21 Watt to 180 Watt at 25C * NF C 93-214 - RBA 13 x 70 - RBA 20 x 117 - RBA 25 x 168 "B" Ring The ceramic tubular core ensures high dissipation capacity and excellent resistance to thermal shock and overload. The resistor winding is evenly coiled on the core and protected by an enamel coating. A longitudinal opening provides for one or more electrical connections by means of sliding collars equipped with a tongued connector. DIMENSIONS in millimeters DIMENSIONS in millimeters WELDED STAINLESS STEEL 304 L BAND "B" A K O4.2 F 45 O J D OB OC E WELDED STAINLESS STEEL 304 L COLLAR "AN" TYPE 1 M OS OC 45 R V X OB T Z A SCREWED STAINLESS STEEL 304 L "CS" TYPE 1 A RA MODEL Connection A2 O B max. O C min. D E ++ 0.5 0 F ++ 0.5 0 H1 J max K max L -- 04 M N -- 04 O max P 1.5 Q 0.5 R S T U 0.5 V X Z approx Average unit weight in g 13 x 70 16 x 94 20 x 117 AN-B AN-B AN-B* 94 117 70 19.5 23 16 9 9 5 16 0.5 17.5 0.5 21 0.7 8 8 7 12 14 10.5 - - - 23 25 19.5 29.5 31.5 24 - - - 78 2 98 2 56 2 - - - 28 33 24.5 - - - - - - 24 0.5 26.5 0.5 31 0.7 4.2 4.2 4.2 6.35 6.35 6.35 - - - 20 0.5 21 0.5 24 0.7 42 1 34.5 1 38 1 5 6 3.5 70 116 40 25 x 138 AN-B-CS 138 28 12 23.5 1 8 15 27 27.5 34 199 117 2 169 38.5 50 24 33.5 1 5.7 9 6.5 28.5 1 51 1.5 6 200 25 x 168 AN-B-CS 168 28 12 23.5 1 8 15 27 27.5 34 229 147 2 199 38.5 50 24 33.5 1 5.7 9 6.5 28.5 1 51 1.5 6 225 30 x 250 AN-B-CS 250 33 17 26 1 8 18 30 30 36.5 317 227 2.5 287 43.5 60 25 36 1 5.7 13 9 33 1 55 1.5 5 415 *Also with CS and CR collars. See RW data sheet. 45 P H OB 26 Q L N 15 U Document Number: 50019 Revision12-Jan-04 For technical questions, contact sfer@vishay.com www.vishay.com 67 RA Vishay Sfernice Adjustable Wirewound Enamelled Resistors MECHANICAL SPECIFICATIONS Mechanical Protection Resistive Element Connections ELECTRICAL SPECIFICATIONS vitreous enamel Ni-Cr wire B band AN or CS collar 40 to 415g Average Unit Weight Resistance Range Tolerance Standard 10% Power Rating 21Wto180Wat25C Temperature Coefficient ENVIRONMENTAL SPECIFICATIONS Temperature Limits Climatic Category 33 to 22k (E6-E24 series) + 75ppm/C (typical) - 55C + 350C - 55C/+ 200C/56 days PERFORMANCE TESTS CONDITIONS REQUIREMENTS TYPICAL VALUES AND DRIFTS 10Pr 5s Voltage < 6000V 2% or 0.05 0.5% 3% or 0.05 Insulation resistance > 100M 1% 5 cycles Humidity (Steady State) 56 days 95% R.H. 2% or 0.05 Insulation resistance > 100M 0.5% Thermal Shock Load at Pr followed by exposure at - 55C/15 2% or 0.05 0.5% 200N 10N 2% or 0.05 0.25% 55/10 1%* or 0.05 0.5% 1% or 0.05 0.25% Short Time Overload - 55C Climatic Sequence Resistor Strength + 200C Vibration Terminals Strength AN B Traction 40Ncm Torque 60Ncm 1000 hours at Pr 25C 90 /30 *1% of total resistance and 2% between sliding collar and fixed connection. Load Life 1.5% 5% SPECIAL FEATURES 13 x 70 16 x 94 20 x 117 25 x 138 25 x 168 30 x 250 RBA 13 x 70 - RBA 20 x 117 - RBA 25 x 168 - 13W - 25W - 50W - 21W 35W 50W 75W 120W 180W RA STYLE Designation NF C 93-214 Power Rating at 25C NF C 93-214 Maximum Power Rating at 25C Ohmic Range (E6, E24 series) 33 3.9k 68 3.9k 100 150 4.7k 6.8k 220 10k 330 22k ADMISSIBLE RATED AMPERAGE This must in all cases be less than: In = Pr (W) Rn ( ) SLIDING COLLAR Resistors are normally supplied with 1 sliding collar fitted and locked in a specific position. Additional collars can be supplied and adjusted at the factory to special order (on request).* *Quote ohmic value and tolerance of each resistance section, and Rn value. MAXIMUM ADDITIONAL COLLARS MODEL AND TYPE RA 13 x 70 RA 16 x 94 RA 20 x 117 RA 25 x 138 RA 25 x 168 RA 30 x 250 Additional sliding collar 1 1 1 2 3 4 www.vishay.com 68 For technical questions, contact sfer@vishay.com Document Number: 50019 Revision 12-Jan-04 RA Adjustable Wirewound Enamelled Resistors Vishay Sfernice POWER RATING CHART % RATED POWER 100 75 50 25 0 0 50 100 150 200 250 300 350 AMBIENT TEMPERATURE IN DEGREES CELSIUS TEMPERATURE RISE RA 13 x7 0 RA 16 x9 RA 4 20 x1 RA 17 25 x1 38 RA 25 x1 68 RA 30 x2 50 HOT SPOT TEMPERATURE IN C 400 300 200 100 0 10 100 1000 RATED POWER IN WATTS MARKING SFERNICE trademark, model, style, NF style (if applicable) ohmic value (in ), tolerance (in %), manufacturing date. ORDERING INFORMATION RA 20 x 117 MODEL STYLE AN SPECIAL DESIGN In option Document Number: 50019 Revision12-Jan-04 6.8k CONNECTIONS OHMIC VALUE 10% 4 SUP. C. TOLERANCE ADDITIONAL SLIDING COLLAR Custom items are subject to extra-charge and min. order. Please see price list. For technical questions, contact sfer@vishay.com www.vishay.com 69