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Abstract
The project is mainly designed to provide low voltage start to all the motors especially the inductive one. This is achieved by using a conversion known as star to delta. These starters are the most commonly used voltage starters in the 50Hz industrial motor world. The full load current is applied to the motor. The three general products are contactors and electromechanical timer and a thermal overload for operating a 3 phase motor at 440 volt. Thus, the interlocking arrangement of all the contactor coils is traditionally wired in 440 volt AC. Proposed system uses a system to start a 3 phase motor at 440 volt AC mains supply 50 Hz with a set of 12 volt DC relays in star mode initially and then to delta mode by an electronically adjusted timer. The relays are used to shift the motor connections from star to delta with a delay in time. The project is supplied with 6 lamps instead of a three phase motor i.e., two lamps representing each phase winding of the motor. DC of 12 volt fed from an inbuilt DC power supply is inter locked with the relay coils and the electronic timer which is used for safe handling of the starter.