RH050300R0FE02 300Ω Wire Wound Resistor 50W ±1%. The Vishay RH050 series wirewound chassis mount resistor has a complete welded and moulded construction for total environmental protection in aluminium housing. These resistors mount directly onto a chassis to utilise heat-sink effect. This range of wirewound resistors offers high stability at conventional power ratings and flat marking surface for easy identification.