RD1V337M1012MBB is a Samwha RESISTOR, WIREWOUND, 3.3OHM, 20W, 5%. It is a high power wirewound resistor with 20 watts power rating and a resistance of 3.3 ohms. It features a flameproof coating, a 4mm wide band, and a radial lead style. It is UL approved, RoHS compliant, and can be used in many applications including audio and lighting.