LV protective relay used in low-voltage networks which is activated when the electrical quantity changed such as voltage and current or physical quantity like thermal degree and oil move and it leads to start other devices and at last break the circuit. These relays include Power Controller Relay and Single-function Protection Relay and are offered in different models. LV protective relay mainly cover one or two protective function , and if the measured value the monitored moves outside the set point limit , the relay will operate. It is used for protection in industry such as electrical furnaces and drying constructions, devices of mechanical engineering, aggregates and extruding presses for plastics, devices, for winding and tempering of springs, spot welding and seam welders ,production of glass and glazing ,chemical and petroleum industries like power station and oil refinery in order to warranty engine function and its safety such as assurance about overload status.
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