RWST Vishay Sfernice Fixed Wirewound High Power Vitreous Resistors Electrical Traction Model FEATURES • 95 Watt to 800 Watt at 25°C • NF C 93-214 • RB 25 x 168, RB 30 x 250 • Rugged construction for use in severe environmental conditions “CS” Type 1 Collars The RWST vitreous wirewound high power resistors are known for their excellent reliability which has developed out of the VISHAY SFERNICE experience over several decades in the field of high current applications. Extremely severe conditions of use are encountered in electrical traction including repeated overloads. To withstand such conditions the new RWST model is extremely rugged and is manufactured to a very carefully monitored process using the best materials DIMENSIONS in millimeters STAINLESS STEEL 304 L COLLARS “CS” type STAINLESS STEEL 304 L COLLARS “CS” type ØC A A D 23 D E E 3 ØB ØB 26 F 58 F G H G H 15 15 J J DIMENSIONS in millimeters RWST STYLE Connections A±2 Ø B max. Ø C min. D E F ± 0.5 –4 G –0 4 H– –0 J ± 0.5 Average unit weight in g (CS collars) Document Number: 50017 Revision 13-Jan-04 25 x 138 CS Type 1/B/AN 25 x 168 CS Type 1/B/AN 30 x 250 CS Type 1/B/AN 40 x 370 CS Type 2/B/AN 50 x 373 CS Type 2/B/AN 138 27 ± 1 168 28 12 50 ± 1 27 ± 1 24 24 250 33 17 60 ± 1.5 30 ± 1 25 370 45 22 69 max. 45 ± 1.5 30 373 53 27.1 80 max. 51 ± 1.5 30 199 229 317 432 432 169 199 287 405 405 6.5 6.5 9 9 9 225 250 445 1400 2200 28 12 50 ± 1.5 For technical questions, contact [email protected] www.vishay.com 61 RWST Vishay Sfernice Fixed Wirewound High Power Vitreous Resistors Electrical Traction Model MECHANICAL SPECIFICATIONS ELECTRICAL SPECIFICATIONS Mechanical Protection Vitreous enamel Resistive Element Ni-Cr wire Connections CS supporting collars AN Collar or B on Request Average Unit Weight 225 to 2200g Resistance Range 2.7Ω to 430kΩ (E12-E24 preferred series values) Resistance Tolerance Standard ± 5% Power Rating ENVIRONMENTAL SPECIFICATIONS Temperature Limits – 55°C + 450°C Climatic Category – 55°C/+ 200°C/56 days 95W to 800W at 25°C Temperature Coefficient 75ppm/°C (typical) Shelf Life 0.1% year (typical) PERFORMANCE TESTS Short Time Overload REQUIREMENTS TYPICAL VALUES AND DRIFTS 10Pr during 5s Voltage limited at < 5000V 2% or 0.05Ω 0.5% 2% or 0.05Ω Insulation resistance 100MΩ 0.5% 3% or 0.05Ω Insulation resistance 100MΩ 0.5% 2% or 0.05Ω 0.5% 1% or 0.05Ω 0.25% 1% or 0.05Ω 0.25% 1% or 0.05Ω 0.5% – 55°C Climatic Sequence + 200°C 56 days 95% relative humidity Humidity (Steady State) Load at 100% Pr followed by cold temperature exposure at –55°C/15’ severity 50A 9 shocks/each side Thermal Shock Shock severity 55B Vibration Terminal Strength CONDITIONS AN B Traction 40Ncm Torque 60Ncm 90’/30’ cycle 1000h at Pr 25°C Load Life 1000h 5% 1% 5000h 2% SPECIAL FEATURES RWST STYLE 25 x 138 25 x 168 30 x 250 40 x 370 – RB 25 x 168 RB 30 x 250 – – 95W 160W 280W 500W 700W 110W 180W 320W 600W 800W Designation NF C 93-214 Power Rating at 25°C Maximum Power Rating at 25°C Ohmic Range (E12, E24 series) Limiting Element Voltage P max. 2.7Ω Critical Resistance 82kΩ 2.7Ω 100kΩ 4.7Ω 220kΩ 8.2Ω 360kΩ 50 x 373 12Ω 430kΩ 1400V 1900V 3000V 4500V 5000V 18kΩ 20kΩ 30kΩ 36kΩ 30kΩ NON INDUCTIVE WINDING For high frequencies, low self induction resistors are available with special windings. RWSTNI designation. MODEL AND STYLE Ohmic range (E12 series) www.vishay.com 62 RWSTNI 25 x 138 22Ω 2.5kΩ RWSTNI 25 x 168 22Ω 4kΩ RWSTNI 30 x 250 120Ω 6.8kΩ For technical questions, contact [email protected] RWSTNI 40 x 370 120Ω 8.2kΩ RWSTNI 50 x 373 150Ω 8.2kΩ Document Number: 50017 Revision 13-Jan-04 RWST Vishay Sfernice Fixed Wirewound High Power Vitreous Resistors Electrical Traction Model POWER RATING CHART % RATED POWER 100 75 50 25 0 0 65 130 195 260 325 390 455 AMBIENT TEMPERATURE IN DEGREES CELSIUS T2 5x 13 RW 8 ST 25 x1 68 RW ST 30 x2 50 RW ST 40 x3 RW 70 ST 50 x3 73 TEMPERATURE RISE RW S HOT SPOT TEMPERATURE IN °C 400 300 200 100 0 10 100 1000 RATED POWER IN WATTS MARKING SFERNICE trademark, model, style, nominal resistance (in Ω ), tolerance (in %), manufacturing date. ORDERING INFORMATION RWST 30 x 250 NI MODEL STYLE NON-INDUCTIVE BOBINAGE SPECIAL DESIGN Optional Optional Document Number: 50017 Revision 13-Jan-04 CS 6.8kΩ ± 5% CONNECTIONS OHMIC VALUE TOLERANCE For technical questions, contact [email protected] Custom items are subject to extra-charge and min. order. Please see price list. www.vishay.com 63