WSMS2906 www.vishay.com vishay dale revision: 21-nov-11 1 document number: 30181 for technical questions, contact: ww2bresistors@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 power metal strip ? meter shunt resistor very low value (down to 0.0003 ? ) features ? high power to resistor size ratio ? 5-terminal connection design ? use for single or multi-phase energy meters ? proprietary processing technique produces extremely low resistance values ? all welded construction ? very low inductance (< 5 nh) ? low thermal emf (< 3 v/c) ? compliant to rohs directive 2002/95/ec note ** please see document vishay material category policy: www.vishay.com/doc?99902 note (1) other values may be available, contact factory standard electrical specifications global model size power rating p 70 c w tolerance % resistance value range ? resistance values currently available (1) ? weight (typical) g/1000 pieces WSMS2906 2906 3.0 5.0 300 to 660 300, 400, 500 4.7 technical specifications parameter unit resistor characteristics temperature coefficient ppm/c 100 for 300 ? and 400 ? , 75 for 500 ? operating temperature range c - 65 to + 170 maximum current rating a ( p / r ) 1/2 global part number information global part numbering example: WSMS2906l4000jk (WSMS2906, 0.0004 ? , 5 %) global model resistance value tolerance code packaging code special WSMS2906 l = m ? l3000 = 0.00030 ? l4000 = 0.00040 ? l5000 = 0.00050 ? j = 5.0 % k = bulk pack (dash number) (up to 2 digits) from 1 to 99 as applicable w s m s 2 9 0 6 l 4 0 0 0 j k
WSMS2906 www.vishay.com vishay dale revision: 21-nov-11 2 document number: 30181 for technical questions, contact: ww2bresistors@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 dimensions in inches (millimeters) derating 1.142 0.010 (29 0.25) 0.827 (21) 0.748 0.010 (19 0.25) 0.551 (14) 0.165 (4.2) dia. 0.051 (1.3) 0.295 0.010 (7.5 0.25) 0.541 (13.75) 0.118 (3) 0.059 (1.5) 0.059 (1.5) 0.305 (7.75) 0.059 (1.5) 70 120 100 80 60 40 20 0 175 150 125 100 75 50 25 0 - 25 - 50 - 65 ambient temperature in c rated power in % tolerances on decimals xxx 0.005 resistance value ( ? ) element material 300, 400, 500 mn-cu performance test conditions of test test limits thermal shock - 55 c to + 150 c, 1000 cy cles, 15 min at each extreme 0.5 % ? r short time overload 5 x rated power for 5 s 0.5 % ? r low temperature operation - 65 c for 45 min 0.5 % ? r high temperature exposure 1000 h at + 170 c 1.0 % ? r bias humidity + 85 c, 85 % rh, 10 % bias, 1000 h 0.5 % ? r mechanical shock 100 g s for 6 ms, 5 pulses 0.5 % ? r vibration frequency varied 10 hz to 2000 hz in 1 min, 3 directions, 12 h 0.5 % ? r load life 1000 h at + 70 c, 1.5 h on, 0.5 h off 1.0 % ? r moisture resistance mil-std- 202, method 106, 0 % power, 7b not required 0.5 % ? r
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