Electrical Resistance Box is a large compact electrical heavy duty device which consist of a number of bi-directional current resisting elements. It is mainly used to control the specific value of current to flow through the circuit. It has high accuracy due to the use of high quality components that are capable to withstand the flowing charge as per their values. Electrical Resistance Box is widely used with the heavy electrical machineries to adjust the level of power signals which in turn helps to control the operational parameters of a mechanism. It is highly advantageous as there is no need to replace the circuit tha value can be simply adjusted with a rotary switch.