| Closed Transition
| A type of wye delta starter that will not have an electrical hitch in operation as the transition from wye to delta takes place. It uses an extra contactor and a set of resistors to keep the motor on-line during the transition. |
| Contactor
| An operating device which connects or disconnects the motor from the power supply. Specifically, such a device that is used when the power poles are operated by an electromagnetic circuit, through the use of a coil and magnetic armature frame. |
| Controller
| Controllers turn on and off the electric current to the motor. A contactor is a type of controller that is controlled by an electromagnet. |
| Delta Configuration
| The normal running electrical configuration for each of the three coils in a wye delta starter. Each coil receives 100% of the full line voltage. |
| Inrush
| Amount of current that is drawn into a motor at start-up. |
| Open Transition
| A type of wye delta starter that may have an electrical hitch in operation as the transition from wye to delta takes place. |
| Overload Protection
| Overload Protection protects motors from drawing too much current and literally “burning out” due to overheating. |
| Reduced Voltage Starter
| A starter used in applications that typically involve large horsepower motors. It is used to reduce the inrush current and limit the torque output and mechanical stress on the load. |
| Resistor
| A device in an electric circuit designed to resist the flow of current through it. |
| Silicon Control Rectifier
| SCR. The key component of a solid state reduced voltage starter. Controls motor voltage, current and torque during acceleration. |
| Taps
| Used on the transformer windings of an autotransformer reduced voltage starter. These devices reduce the line voltage to start the motor with reduced current. |
| Torque
| Turning or rotational force. |
| Wye Configuration
| The starting electrical configuration for each of the three coils in a wye delta starter. Each coil receives 58% of the line voltage, which results in only 33% of the normal starting current. |
