A tubular ceramic form has copper-alloy or chromium-alloy windings as a resistance element, with the resistor mount attachment method the same as the other resistors described. Except for the sliding contact surface on the windings, the entire component is coated with a high-temperature non-flammable resin. The adjustment mechanism is a rotating point that slides directly on the resistance element, which allows variation of the resistance value (See the specifications of the DR series and VR series for exact features). Suitable for education, testing, load simulations, automation control installations, etc. For custom specifications, please contact us to discuss the details.