Resistance boxes are used for calibration of devices that measure resistance at many electrical laboratories. In this research, a new automated Resistance Box (RB) has been presented that mainly consists of three decades. They have the same design, but each has four different internal resistive elements. Each decade generates 15 different output resistance values; therefore, it is more economical and practical compared to the other usual decades, which produce only 10 values by using 10 internal resistive elements per decade. 4096 resistance values can be obtained by the all possible combinations of the new RB decades. Design, fabrication process, and characterization of the new RB are demonstrated in detail including its main specifications and advantages. Maximum relative deviation from the nominal values of the new RB steps is 50 ppm. (C) 2017 Elsevier Ltd. All rights reserved.