Wirewound Fuse Resistors Vishay Dale Fast Acting, Molded Styles Custom Designed For Your Application FEATURES * * * * * * * Low temperature coefficient typical of wirewound resistor High temperature silicone molded package Performs function of resistor and series fuse and provides predictable fusing times Complete welded construction No flaming or distortion of unit under fusing conditions Ideal for Squibb circuit applications and protection of semi-conductor devices Negligible noise and voltage coefficient TYPICAL ELECTRICAL SPECIFICATIONS The following are offered as examples of reliable designs. Hundreds of possible combinations are available for meeting your requirements. Contact factory by using email address in the footer of this page, for assistance. Higher wattages available. 1.0 WATT CONTINUOUS POWER* FUSING PARAMETERS MODEL FUSING CURRENT Amperes TYPICAL FUSING TIME Milliseconds RESISTANCE RANGE CONTINUOUS CURRENT CROSSOVER VALUE Amperes 5%, 10% Available RS-1A-209 0.5 4 49 - 500 0.10 RS-1A-118 1.0 9 6.8 - 185 0.25 100.0 16.0 RS-1A-212 1.25 8 4.7 - 107 0.30 11.11 RS-1A-213 1.5 15 3.5 - 68 0.35 8.16 RS-1A-143 2.0 15 2.2 - 35 0.40 6.25 RS-1A-214 2.5 23 1.7 - 23 0.45 4.94 RS-1A-162 3.0 48 1.1 - 12 0.55 3.31 RS-1A-208 4.0 47 0.72 - 6.44 0.75 1.78 RS-1A-207 6.0 70 0.35 - 2.17 1.0 1.0 RS-1A-215 8.0 48 0.29 - 1.61 1.25 0.64 RS-1A-173 10.0 50 0.23 - 1.16 1.50 0.44 RS-1A-216 15.0 35 0.19 - 0.82 1.75 0.33 RS-1A-217 20.0 46 0.12 - 0.42 2.0 0.25 * The Continuous Current Rating applies only to values equal to or less than the Crossover Value. The Continuous Power Rating applies only to values equal to or higher than the Crossover Value. Note: Be aware that the inherent compromise involved between resistive and fusing functions sometimes makes certain exact combinations unattainable. However, in nearly all cases, this does not prevent the production of a functional, reliable fuse resistor thoroughly capable of meeting application requirements. ORDERING INFORMATION RS-1A-209 MODEL 402 RESISTANCE 5% TOLERANCE % If a MODEL listed in TYPICAL ELECTRICAL SPECIFICATIONS table does not meet your requirements, then please include the following information. It will enable us to choose the best design for your application. 1. Operating wattage or current, ambient temperature and required resistance stability. (% R/1000 hours.) 2. Fusing wattage or current and maximum "blow" time. Also, minimum "blow" time, if applicable. 3. Nominal resistance and maximum allowable resistance tolerance, (5% to 10% preferred). 4. Maximum allowable physical size. 5. Voltage to be interrupted. 6. Frequency of power source, wave form and a brief description of your application. www.vishay.com 142 For technical questions, contact ww2aresistors@vishay.com Document Number: 30232 Revision 10-May-01 Wirewound Fuse Resistors Fast Acting, Molded Styles Custom Designed For Your Application Vishay Dale DIMENSIONS in inches [millimeters] 1.25 [31.75] Minimum A 0.020 0.002 [0.508 0.051] B MODEL A B 1.0 Watt 0.422 0.015 [10.72 0.381] 0.110 0.015 [2.79 0.381] TECHNICAL SPECIFICATIONS PARAMETER UNIT TYPICAL WIREWOUND FUSE RESISTOR CHARACTERISTICS % 3, 5, 10 ppm/C 90 - 0.1 thru 0.99; 50 - 1 thru 9.9; 30 - 10 and above Power Rating W 1.0 standard, higher power ratings available Dielectric Strength VAC 500 Insulation Resistance M 1000 minimum dry Fusing Times S 0.001 to 1.0 Minimum Fusing Current A Approximately 4 times the continuous operating current obtainable on some designs. Larger ratios produce better designs. Terminal Strength lb 5 minimum Solderability - Terminals are 60/40 electro tin plated to facilitate soldering Resistance Tolerance % OF RATED POWER Temperature Coefficient 120 MATERIAL SPECIFICATIONS Element: Copper-nickel alloy or nickel-chrome alloy, 100 depending on resistance value 80 Core: Alumina ceramic 60 Encapsulant: Thermoset silicone mold compound 40 End Caps: Stainless steel 20 Terminals: Tinned copperweld 0 0 50 25 75 100 125 150 175 200 Part Marking: DALE, Model, Value, Tolerance, Date Code AMBIENT TEMPERATURE C Derating Document Number: 30232 Revision 10-May-01 For technical questions, contact ww2aresistors@vishay.com www.vishay.com 143