0 Motor Contactors
Last Updated: April 1, 2025
Description
Motor contactors are devices used to control the power flow to electric motors. They function as a protection device, ensuring that the motor operates safely by managing the electrical current that flows to it. Motor contactors are available in various configurations, including two-pole, three-pole, and four-pole devices, each designed to handle different voltage and current requirements.
Working Principle
Motor contactors operate using an electromagnetic mechanism. When the coil within the contactor is energized, it creates a magnetic field that pulls a set of contacts together, allowing electrical current to flow through the motor. This electromechanical action is crucial for controlling the motor's operation, as it enables the contactor to switch the motor on and off without manual intervention. The use of motor contactors is beneficial because they provide a reliable means of controlling high-power motors, ensuring that they do not draw excessive current during startup and protecting them from low-voltage conditions and power interruptions.
Applications
Motor contactors are widely used in industrial and commercial settings where electric motors are prevalent. Specific applications include controlling motors in conveyor systems, HVAC systems, and manufacturing equipment. They are also used in applications that require frequent switching of motors, such as in automated production lines and machinery that operates in cycles.
Advantages over other Motor Contactors
One advantage of certain motor contactors is their ability to provide overload protection, which is not always available in simpler switch-based systems. Additionally, motor contactors can be equipped with auxiliary contacts that allow for the integration of additional control functions, such as indicating lights or interlocking with other motor starters. This flexibility makes them more versatile than basic motor control devices.
Limitations
Motor contactors have limitations, including the potential for mechanical wear and tear due to the moving parts involved in their operation. Over time, the contacts can degrade, leading to reduced performance or failure. Additionally, motor contactors may not be suitable for environments with high levels of dust or moisture unless they are specifically designed to be hermetically sealed.
Considerations
When selecting motor contactors, several factors should be considered. Initial costs can vary depending on the size and features of the contactor, with more advanced models typically costing more. Operating expenses may include energy consumption and maintenance costs, as regular inspection and replacement of worn contacts are necessary to ensure reliable operation. Durability is an important consideration, especially in harsh environments, where sealed or intrinsically safe models may be required. Accuracy in controlling the motor's operation is generally high, but it is essential to choose a contactor that matches the motor's specifications to avoid issues. Replacement and maintenance costs should also be factored into the overall cost of ownership, as these can impact the long-term viability of the motor control system.
from Altech Corp.
Features: 8 Frame Sizes. 1/2HP up to 600HP @ 480V AC. Direct Mounting Overload Relays. Degree of protection:IP20. Flame Resistance:According to UL948 [See More]
- NEMA Size: 0
- Device Technology: Electro-mechanical
- Standard Rating: NEMA; IEC
- AC Motor Phase: Single
from Allen-Bradley / Rockwell Automation
300 NEMA Contactor, NEMA Size 0, Open, 240V 60Hz, Three Poles, 1 N.O. Auxiliary Contact [See More]
- NEMA Size: 0
- Standard Rating: NEMA
from Radwell International
DISCONTINUED BY MANUFACTURER, CONTACTOR NEMA 0 18AMP 1PH 2HP 460/575V. FREE 2 YEAR RADWELL WARRANTY [See More]
- NEMA Size: 0
- Standard Rating: NEMA
from Allen-Bradley / Rockwell Automation
300 NEMA Contactor, NEMA Size 0, Open, 550V 50Hz / 600V 60Hz, Three Poles, 1 N.O. Auxiliary Contact [See More]
- NEMA Size: 0
- Standard Rating: NEMA
from Allen-Bradley / Rockwell Automation
NEMA Combination Contactor, Circuit Breaker Type, NEMA 0, 480 Volts (B), Type 1 - Enclosure Code A"" [See More]
- NEMA Size: 0; 1
- Control Voltage: 120
- Standard Rating: NEMA
from Allen-Bradley / Rockwell Automation
NEMA Combination Contactor, Disconnect Type, NEMA 0, 240 Volts (A), Type 1 - Enclosure Code A"" [See More]
- NEMA Size: 0; 1
- Control Voltage: 240
- Standard Rating: NEMA
from Allen-Bradley / Rockwell Automation
NEMA Combination Contactor, Disconnect Type, NEMA 0, 480 Volts (B), Type 1 - Enclosure Code A"" [See More]
- NEMA Size: 0; 1
- Standard Rating: NEMA
from Allen-Bradley / Rockwell Automation
500FL NEMA Feed-Through Wiring Electrically Held Lighting Contactor ,20A, Open, 230-240V 60Hz, 2 Power Poles , 230-240V 60Hz , [See More]
- NEMA Size: 0
- Continuous Current: 15
- Standard Rating: NEMA
- Number of Poles: 2
from Allen-Bradley / Rockwell Automation
500FL NEMA Feed-Through Wiring Electrically Held Lighting Contactor ,20A, Open, 115-120V 60Hz, 2 Power Poles , 115-120V 60Hz , [See More]
- NEMA Size: 0
- Continuous Current: 15
- Standard Rating: NEMA
- Number of Poles: 2
from Allen-Bradley / Rockwell Automation
NEMA Combination Lighting Contactor, Circuit Breaker Type, 15 A Tungsten/ 20 A General, 240 Volts (A), Type 3R/4/12 - Enclosure Code F"" [See More]
- NEMA Size: 0; 3
- Continuous Current: 15
- Standard Rating: NEMA
- Control Voltage: 240
from Allen-Bradley / Rockwell Automation
NEMA Combination Lighting Contactor, Disconnect Type, 15 A Tungsten/ 20 A General, 600/110/120 VAC - 50/60Hz (CD), Type 3R/4/12 - Enclosure Code F"" [See More]
- NEMA Size: 0; 3
- Standard Rating: NEMA
from Allen-Bradley / Rockwell Automation
500LP NEMA Top Wiring Permanent Magnetic-Latching Lighting Contactor ,20A, Open, 115-120V 60Hz, 3 Power Poles, No , 115-120V 60Hz , [See More]
- NEMA Size: 0
- Continuous Current: 15
- Standard Rating: NEMA
- Number of Poles: 3
from Allen-Bradley / Rockwell Automation
500LP NEMA Top Wiring Permanent Magnetic-Latching Lighting Contactor ,20A, Open, 115-120V 60Hz, 3 Power Poles, No , 115-120V 60Hz , Auxiliary Contact (On Contactor) [See More]
- NEMA Size: 0
- Continuous Current: 15
- Standard Rating: NEMA
- Number of Poles: 3
from Allen-Bradley / Rockwell Automation
500F, 500FC NEMA AC/DC Contactor,Motor Loads,Feed-Through ,SIZE 0, Open, 115-120V 60Hz, 3 Power Poles, Yes , 18 , 110/120V 50/60 Hz , [See More]
- NEMA Size: 0
- Continuous Current: 18
- Standard Rating: NEMA
- Number of Poles: 3
from Allen-Bradley / Rockwell Automation
500F, 500FC NEMA AC/DC Contactor,Motor Loads,Feed-Through ,SIZE 0, Open, 115-120V 60Hz, 3 Power Poles, Yes , 18 , 110/120V 50/60 Hz , Auxiliary Contact (On Contactor) [See More]
- NEMA Size: 0
- Standard Rating: NEMA
from CARLO GAVAZZI Automation Components
General. Four frame sizes. Motor ratings of each frame size: Up to 20, 30, 60 or 75HP. Resistive rating Up to 40, 60, 100, 160A. AC or DC coil voltage. Two connection types: Screw terminal connections are available on all frame sizes Lug terminals connections are available on 63 and 100 amp sizes. [See More]
- NEMA Size: 00; 0; 1; 2; 3
- Device Technology: Electro-mechanical
- Standard Rating: NEMA
- AC Motor Phase: Single (optional feature); Three