In general, the fundamental components of the electrical power industry in which energy is stored in various forms must undergo periodic charging and discharging processes in accordance with a specified characteristic curve.

Two important examples of such equipment are batteries and industrial capacitors.

Manufacturers of industrial batteries and capacitors provide guidelines in order to improve performance and prevent reduction of service life. One part of these guidelines relates to the charging and discharging of batteries and capacitors during initial commissioning as well as during maintenance and servicing intervals.

To generate the required characteristic curves in both charging and discharging modes, resistors with relatively high power ratings and low resistance variation must be used, and their taps must be connected to the output terminals of the battery or capacitor.

Therefore, these types of resistive products are usually designed with multiple power taps to cover a wide range of battery/capacitor ratings. They are equipped with a main switch and auxiliary switches for selecting each tap, and in most cases, these loads are manufactured as portable, wheeled units.

Borna Electronics Company is the only manufacturer of these resistors in Iran, taking into account the relevant technical considerations. These products are widely used in industrial applications, particularly in petrochemical sites, transmission substations, and power plants currently in operation.

Another application of these resistors is in transportation and railway (traction) systems, where they are used to dissipate stored energy and prevent overvoltage and harmonic generation when the drive is disconnected from the power supply.