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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.
Motor starters and contactors comply with ratings or standards from the National Electrical Manufacturers Association (NEMA) and the International Electrotechnical Commission (IEC). There are 11 NEMA sizes: 00, 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. IEC sizes use letters instead of numbers, and are rated at either the thermal current rating or the operational current. Choices for IEC-rated motor starters and contactors include A, B, C, D, E, F, G, H, J, K, L, M, and N. Number of poles, control voltage, current-line acceleration, time-limit acceleration and operating temperature are also important parameters to consider when selecting motor starters and contactors.
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Engineering Web: Motor Starters and Contactors
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SQUARE D 8536SCA3V08H10 Magnetic Motor Starter > Starters and Contactors > Magnetic Motor Starters > Magnetic Motor Starter Magnetic Motor Starter Solid State Over See Grainger Industrial Supply Profile & Catalog |
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SQUARE D 8536SCG3V02S Motor Starter, NEMA 1, 120V, 3 Pole, 27A... See Grainger Industrial Supply Profile & Catalog |
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Contactors - Motor Protection - Accessories 1/0 Overview 1 Contents Overview 3-pole Block Contactors and Motor Protection ...................................................................... |
Part Numbers for Motor Starters and Contactors
| Part # | Distributor | Manufacturer | Product Category | Description |
|---|---|---|---|---|
| 2UXX9 | Grainger Industrial Supply | GRAINGER INTERNATIONAL INC. | Magnetic Contactors | IEC Magnetic Motor Starter,240V Coil,32A |
| 2UXV6 | Grainger Industrial Supply | GRAINGER INTERNATIONAL INC. | Magnetic Contactors | IEC Magnetic Motor Starter,240V Coil,12A |
| 2UXX4 | Grainger Industrial Supply | GRAINGER INTERNATIONAL INC. | Magnetic Contactors | IEC Magnetic Motor Starter,24V Coil,25A |
| 2UXV9 | Grainger Industrial Supply | GRAINGER INTERNATIONAL INC. | Magnetic Contactors | IEC Magnetic Motor Starter,240V Coil,18A |
| 1DNW8 | Grainger Industrial Supply | SCHNEIDER ELECTRIC | NEMA Combination Starters | Combination Motor Starter,Fusible,45A |
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