OVSA www.vishay.com Vishay Milwaukee Wirewound Resistors, Industrial Power, Tubular, Flat, Oval, Adjustable, OVSA FEATURES • Terminal bands are spotwelded onto the insulated core and resistance-alloy wire is precisely wound onto the oval core • The wire is spotwelded to the terminal bands and then “locked” onto the core with a silicone or cement coating • Available as fixed and adjustable resistors (for fixed Oval Resistor see www.vishay.com/doc?31835) • Wirewound • Material categorization: For definitions of compliance please see www.vishay.com/doc?99912 STANDARD ELECTRICAL SPECIFICATIONS GLOBAL MODEL HISTORICAL MODEL POWER RATING W RESISTANCE RANGE TOLERANCE (1) ±% TERMINAL STYLE OVSA0040 16-32 A Oval 40 1.7 to 27K 10 A OVSA0055 16-56 Oval 55 2.4 to 64K 10 A OVSA0070 16-76 A Oval 70 3.0 to 92K 10 A OVSA0095 16-96 A Oval 95 4.1 to 120K 10 A Notes • Ratings are based on a temperature rise of 300 °C above an ambient of 40 °C. (1) Standard fixed resistance tolerance ± 5 %. Resistance values less than 1 and adjustable have ± 10 % tolerance. Closer tolerances available upon request. DERATING FOR GROUP INSTALLATIONS % OF SINGLE RATING NUMBER OF RESISTORS STACKED VERTICAL CHASSIS HORIZONTAL CHASSIS 2 80 75 3 70 60 4 65 50 Notes • Ratings are based on mounting on a steel panel 10" x 10" x 0.040". Derate by 29 % when mounting on non-heat conductive surface. DIMENSIONS in inches (millimeters) GLOBAL MODEL DISTANCE BETWEEN TERMINALS A L OVERALL LENGTH WEIGHT (TYP.) g OVSA0040 2.75 (69.85) 2 (50.8) = A + 0.625 (15.875) 24 OVSA0055 4.25 (107.95) 3.5 (88.9) = A + 0.625 (15.875) 37 OVSA0070 5.5 (139.7) 4.75 (120.65) = A + 0.625 (15.875) 45 OVSA0095 6.75 (171.45) 6 (152.4) = A + 0.625 (15.875) 60 Revision: 08-Oct-13 Document Number: 31836 1 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 OVSA www.vishay.com Vishay Milwaukee TERMINAL STYLE in inches (millimeters) A D A C D C Type A B Type H B DIMENSIONS A (3/16" LUG) Width (A) 0.1875 (4.7625) H (1/4" SQC) 0.25 (6.35) Height (B) 0.375 (9.525) 0.625 (15.875) Dia. (C) 0.13 (3.302) 0.065 (1.651) Thickness (D) 0.02 (0.508) 0.032 (0.8128) MATERIAL SPECIFICATIONS Element Copper-nickel, nickel-chrome, iron-chrome-aluminum Core Steatite Coating High temperature silicone Standard terminals Nickel-iron Part marking Value, date code, MRC GLOBAL PART NUMBER INFORMATION Global Part Numbering example: OVSA0070137K0JHB00 (OVSA0070 137K 5 % 1/4SQC B) O V S MODEL COATING (2 digits) (1 digit) OV A TYPE (1 digit) S= A= Silicone Adjustable 0 SIZE (4 digits) 0030 = 30 W 0095 = 95 W Available sizes: 0030 0040 0055 0070 0095 Revision: 08-Oct-13 0 7 VALUE (5 digits) 0 1 TOLERANCE (1 digit) 3 7 K TERMINAL (1 digit) J = ± 5.0 % A = 3/16" lug (3/16L) R = Decimal H = 1/4" single K = Thousand K = ± 10 % quick-connect R1500 = 0.15 (1/4SQC) 1K500 = 1.5 k Check datasheet for available value range 0 J H B 0 0 PACKAGING (1 digit) SPECIAL (2 digits) B = Bulk 00 = Standard NI = Non-inductive NS = No strips and spacers Document Number: 31836 2 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. 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