FW Fusible Wirewound Power Resistors Bourns FW Series Fusible Wirewound Power Resistors are designed to fuse under abnormal conditions such as sudden surges in voltage or circuit malfunctions. The Bourns FW series fusible wirewound power resistors will fuse upon application of 120V or 240V. The axial leaded resistors feature 5% tolerance, 10Ω resistance, and 1W, 2W, 3W, 5W, or 7W rating. Bourns FW Series Fusible Wirewound Power Resistors are ideal for metering, lighting, inverters, and White Goods.