General purpose of this article is Motor Control Unit. Motor control unit is very important electronic device. Permanent magnet contractors are primarily accustomed to start electrical motors as it can prevent damage to the motors with event the electric motor gets jammed as well as overloads. This is achieved through passing the current with an overload protection coil nailers before energizing the magnet. If the motor gets jammed and overloads the circuit, the overload coil nailers will automatically cut from the current thereby de-energizing the coil and therefore opening the acquaintances.