• Toshniwal Industries Private Limited

Rheostats

Toshniwal Industries offers a range of Rheostats that are mainly used for regulating electric current in industry and laboratory where they are used as adjustable resistors in electronic circuits. With three terminal provision, these can also be used to vary a DC potential smoothly from zero to maximum. Toshniwal rheostats consist of oxidised nickel-copper resistance wire wound on a former, which is made from solid drawn hexagonal steel tube vitreous enameled, ensuring good mechanical strength and sturdiness. The tube is fitted in two end castings insulated with insulating cups. The brush gear slides on a highly polished square slide rod. The brush is of copper graphite with pigtail connections. Two heat resisting compression springs hold brush firmly in contact with the resistance wires. Copper graphite brush provides necessary lubrication to prevent wear and tear of wire even at elevated temperatures. The brush is housed in a slider knob of moulded bakelite designed for easy handling. Different designs in single tube and double tube models are available to meet with demands of different applications. In many applications, larger values of resistance are required to be accommodated in small space but at the same time, the current rating desired varies for lower to the higher values of resistance. For such requirements, rheostats are also available in space saving graded winding designs. For requirement of graded rheostats desired resistance, voltage, maximum and reduced current rating should be stated. Lead screw type rheostats are also available for precision and smooth setting of brush position using hand wheel provided axially or at right angles to the lead screw, which replaces the side shaft in this design. These rheostats are available in different designs depending upon the application. The various types are: single tube open, single tube protected, double tube open and back of panel mounting.