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About Motor Starters and Contactors
Motor starters and contactors are motor-starting devices. They combine a contactor with overload protection and are designed for starting AC or DC motors. Motor starter ratings include continuous current, thermal current, motor voltage, and power. Continuous current, a specification which is also known as continuous ampere rating, measures the ability of motor starters and contactors to handle current over a continuous period. Thermal current is directly proportional to the coefficient of thermal conductivity (k), the property of a material which indicates its ability to conduct heat. Power ratings for motor starters and contactors vary by motor type. For example, AC motor starters and contactors carry ratings for single-phase power or three-phase power. DC motor starters have a DC horsepower rating.
Engineering Web: Motor Starters and Contactors - Machine Design
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Three-Phase Motor Starters | Machine Design Three-Phase Motor Starters October 26, 2006 The power module has a motor-protective circuit breaker and one or two contactors. |
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Self-Protecting Starters | Machine Design Self-protected starters are sized for the horsepower and full-load current of the motor. |
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DC Controllers | Machine Design Magnetically operated contactors usually provide a safer and more convenient means for controlling motor power circuits, particularly in large |
