Rolling Meadows, Ill. Ohmite Manufacturing Company has introduced a new WFH series of flat heatsinkable wirewound resistors with ratings from 90 to 330 watts. The company says the new resistors offer a cost, weight and space savings as well as superior thermal efficiencies compared with conventional aluminum-housed resistors.
The WFH resistors are wound on flat cores rather than cylindrical, and are housed in flat aluminum extrusions that are 12.6 mm in height across the entire product range. Heat is efficiently spread through the wide aluminum base plate to the heat sink. The resistor series is tappable, which is a feature not available in MIL-R-18546 type resistors. It also features solder, cable and "Fast-On" termination options. For detailed specs, check out the the datasheet at Ohmite's web site.
Pricing ranges from $17 to $42 each for 330-watt units in quantities of 1 to 500.
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