RWM www.vishay.com Vishay Sfernice Enamelled Wirewound Power Resistors Axial Leads FEATURES High dissipation up to 30 W (25 C) Fire proof Excellent endurance typical drift 1.5 % after 1000 h Conformal vitreous enamel All welded construction Low ohmic values 0.33 available Termination: Sn/Ag/Cu Material categorization: for definitions of compliance As a result of more than 50 years of experience an d please see www.vishay.com/doc 99912 continuous improvements the RWM series of resistors features proven reliability in AC or DC applications. The performance of this series of professional resistors fully The high quality of the RWM resides mainly in the use of a meets the requirements of the following specifications: proprietary Vishay Sfernice enamel fired at high temperature - NF C 83-210-001 and free from any compound liable to corrode the resistive - CECC 40201-001 wire. - BS - CECC 40201-002 DIMENSIONS in millimeters 25 min. A 25 min. B 0.8 0.1 RWM RWM RWM RWM RWM RWM 6 x 34 8 x 34 8 x 45 10 x 45 10 x 64 10 x 65 A 33.7 1 33.7 1 45.8 2 45.8 2 63.8 1 63.8 1 B 7.4 1.5 7.4 1.5 9.4 1.5 9.4 1.5 9.4 1.5 9.4 1.5 Weight in g 4 4 8 8 14 14 STANDARD ELECTRICAL SPECIFICATIONS RESISTANCE RATED POWER LIMITING ELEMENT TOLERANCE MODEL SIZE RANGE P VOLTAGE 25 C % W V RWM 6 x 34 0634 0.33 to 36K 8 500 1, 2, 5 RWM 8 x 34 0834 0.33 to 36K 11 650 1, 2, 5 RWM 8 x 45 0845 0.47 to 62K 11 650 1, 2, 5 RWM 10 x 45 1045 0.47 to 62K 25 800 1, 2, 5 RWM 10 x 64 1064 0.68 to 100K 25 800 1, 2, 5 RWM 10 x 65 1065 0.68 to 100K 30 800 1, 2, 5 Revison: 08-Jul-2020 Document Number: 50008 1 For technical questions, contact: sferfixedresistors vishay.com 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 91000RWM www.vishay.com Vishay Sfernice TECHNICAL SPECIFICATIONS VISHAY SFERNICE SERIES AND RWM RWM RWM RWM RWM RWM STYLE 6 x 34 8 x 34 8 x 45 10 x 45 10 x 64 10 x 65 at +70 C 7 W 9.5 W 9.5 W 21 W 21 W 25.8 W at +25 C 8 W 11 W 11 W 25 W 25 W 30 W Power Rating With Surface Temp. 12 W 14 W 20 W 25 W 25 W 30 W +450 C Ohmic Range in Relation to Tolerance 0.33 0.33 0.47 0.47 0.68 0.68 5 % E24 Series 36 k 36 k 62 k 62 k 100 k 100 k Qualified Ohmic Range 0.33 0.47 - -- - NF C 83-210 15 k 33 k Limiting Element Voltage 500 V 650 V 650 V 800 V 800 V 800 V Critical Resistance 31 k - 38 k 25.6 k 25.6 k 21.3 k PERFORMANCE CECC 40201 - EN 140-201 TYPICAL DRIFTS TESTS CONDITIONS REQUIREMENTS 10 P during 10 s r Short Time Overload (2 % + 0.1 ) (0.5 % + 0.05 ) 25 C ambient Temperature Cycling -55 C +200 C (1 % + 0.05 ) (0.5 % + 0.05 ) (5 cycles) 56 days Humidity (Steady State) (5 % + 0.1 ) (0.5 % + 0.05 ) 40 C ambient - R.H. 95 % Tensile test: 20 N Terminal Strength 2 successive bending (1 % + 0.05 ) (0.1 % + 0.05 ) 2 full rotations of 180 1000 h at P r Load Life 90/30 cycle (5 % + 0.1 ) (1.5 % + 0.05 ) 25 C ambient Group Mounting OVERLOAD In a still atmosphere, a distance between axes equal to five Heavy overloads can be endured in the form of short pulses times the resistors diameter is recommended. < 0.1 s. Particular requirements should be submitted to Cabinet Mounting Vishay Sfernice, specifying peak voltage, cycle an d environmental conditions. Unventilated box: Dissipation should be reduced (see dimensional drawing). RECOMMENDATIONS FOR USE Forced ventilation: If conditions are appropriate, Since these components are high dissipation powe r dissipation may be doubled or even trebled. resistors, customers are advised to use a high melting point In any case: The surface temperature at the hottest point solder. should not exceed 450 C. For low ohmic values, the measurement becomes critical These aspects should be considered by the end user. and the connecting wires resistance is to be included. Th e value is measured at 5 mm from the resistor body. ELECTRICAL SPECIFICATIONS Standard 5 % (NI 10 %) Tolerance On request 1 % and 2 % (NI 5 %) Temperature Coefficient +75 ppm/C typical Dielectric Withstanding Voltage NF EN140000 500 V - 1 min - 10 mA RMS Inductance Non inductive (Ayrton-Perry) winding available Revison: 08-Jul-2020 Document Number: 50008 2 For technical questions, contact: sferfixedresistors vishay.com 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