3W Power Resistors Low as 100 µΩ
Vishay Intertechnology, Inc. announced a new Power Metal Strip® meter shunt resistor that combines a 3 W power capability in the 3124 size package with extremely low resistance values down to 100 µΩ The WSMS3124 allows placement of an electron-beam welded shunt in electrical wattmeters. The design also incorporates a physical shape that results in very low TC characteristics (down to 75 ppm/°C).
The WSMS3124 meter shunt resistor features a proprietary processing technique that produces extremely low resistance values from 100 µΩ to 750 µΩ. These values allow for increased accuracy in current meter shunt applications for industrial and consumer single- or multiphase energy meters. With a tolerance of 5.0 %, the new resistor provides power companies with more accurate data to determine customer usage and to adjust billing terms.
The WSMS3124 features a five-terminal connection design and an all-welded construction that contributes to its superior electrical performance. The resistor offers very low inductance values of < 0.5 nH and a low thermal EMF of < 3 µV/°C. The device is lead (Pb)-free and RoHS-compliant.
Samples and production quantities of the new meter shunt resistor are available now, with a lead time of eight to 10 weeks for larger orders.