Enamelled Wirewound Power Resistors Axial Leads. As a result of more than 50 years of experience and continuous improvements the RWM Series of resistors features proven reliability in AC or DC applications. The high quality of the RWM resides mainly in the use of a proprietary Vishay Sfernice enamel fired at high temperature and free from any compound liable to corrode the resistive wire. High dissipation up to 30 W (25 °C). Fire proof. Excellent endurance typical drift ± 1.5 % after 1000 h. Conformal vitreous enamel. All welded construction. Low ohmic values 0.1 Ohms available. Termination: Sn/Ag/Cu.