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Motor Starters

As their name suggests, motor starters are electrical devices that control the electrical power for starting motors. They are also used to stop and reverse electric motors and are found in a range of industrial and automotive settings.

At Allied Electronics, we stock over 200 hundred motor starters, so you’re sure to find what you need for the task at hand. Take your pick from leading names and be assured of high-quality products.

Read on to find out more about motor starters.

What are motor starters?

A motor starter is an electromechanical switch that is one of the most significant components for motor control applications. It controls the electrical power used in a motor and has the functionality to change the flow of power so that, as well as starting the motor up, it can stop, reverse, and protect the motor from damage.

Motor starters operate in a similar way to a relay. However, the main difference between these is that the starter contains two major components that are there to provide power for, and prevent the electrical overloading of, the motor. These are the contactor and the overload relay. The contactor’s role is to send power to the circuit or break it off. The overload relay avoids the motor from overheating or drawing too much current, which can lead to the motor burning out.

What’s the difference between a motor starter and contactor?

The motor starter contains a contactor. However, contactors can be purchased separately. There are significant differences between a motor starter and contactor to be aware of. Knowing these will help you choose the appropriate device.

In terms of design, a motor starter and contactor are very similar. The contactor itself has the consistent function of switching a current on and off. But the major difference is that the starter has the overload relay that monitors the heat generated from excessive current changes and protects the motor from overheating. By combining the contactor with the overload relay, the motor starter is able to perform more functions than a contactor.

What are the different types of motor starters?

In order to choose the right motor starter for the job you’re working on, it’s worth knowing the different types of motor starter on the market. There are four common types available. These are:

  • DOL Starters: Direct online (DOL) starters, also known as across the line starters, are the most well-known general purpose starter. The full voltage of the power supply is connected directly to the motor using a magnetic contactor circuit. This pulls the contactors together to close the circuit and start the device. DOL starters are used for motors that run in one direction at a single speed.
  • Reversing DOL Starters: These motor starters can run a motor either forwards or backwards. They feature three buttons and are useful for conveyor based machinery, where it’s necessary to reverse direction.
  • Star Delta Starter: This is a reduced voltage motor starter. It is designed to control a three-phase induction motor. The windings in this starter are switched between star and delta connections to start the motor.
  • Soft Starter: These are used in AC electric motors. They reduce the torque and load in the power up and electrical current surges that are typical with motors during their start-up phase.

What are the advantages of using motor starters?

Motor starters are used in a variety of industrial and automotive settings. Due to their ability to protect the motor via the overload relay, they offer both practicality and safety.

For instance, in a factory setting where a conveyor belt is used, being able to reverse the belt with a motor starter can make processes easier and preserve the motor, making it a cost-effective device. Similarly, in automation they can be used to start and stop a motor, safely powering up a vehicle.

Each type of motor starter has its plus-points too. For instance, the DOL starter has a simple, cost-effective design, is easy to understand and use, and can provide a high starting torque. The star delta starter also has a simple design and is cheap. It also provides a low surge current, making it ideal for starting large induction motors.

Take the time to research the right motor starter for the job you’re working on to weigh up which could be the right fit.

Why choose Allied Electronics for motor starters?

We stock a full range of motor starters that are designed to control electric motors safely and effectively. We are a leading authorized distributor of motor starters in North America and stock leading names, including Schneider, Siemens, and Eaton motor starters, so you’re assured of the highest-quality products when you choose from our selection. Additionally, each of these devices meet the highest industry and safety standards.

If you have any questions, we’re here to help. Contact us for advice and tips. You can also find more information in our expert content hub.

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Availability
Price
Starter Type
Number of Poles
Motor FLA Range
Control Voltage
Auxiliary Contact
Current Rating
Frame Type
Mounting Type
Special Features
Series
In Stock: 15
On Order: 34
+1 $744.953 /ea
+3 $705.947 /ea
NEMA Starter
3
Heaters Purchased Separately
110VAC@50Hz| 120VAC@60Hz
1NO
27 A
1 Frame (65mm)
Panel Mount
Freedom Series
In Stock: 18
+1 $1,492.645 /ea
+3 $1,447.864 /ea
NEMA Starter
3
Heaters Purchased Separately
110VAC@50Hz| 120VAC@60Hz
1NO
45 A
2 Frame (65mm)
Panel Mount
Freedom Series
In Stock: 44
1 $455.29 /ea
NEMA Starter
3
4-20 A
110VAC@50Hz| 120VAC@60Hz
1NO
27 A
1 Frame (65mm)
Panel Mount
Electronic Overload Relay
Freedom Series
In Stock: 0
On Order: 32
+1 $622.358 /ea
+5 $602.569 /ea
+10 $583.44 /ea
NEMA Starter
3
Heaters Purchased Separately
110VAC@50Hz| 120VAC@60Hz
1NO
18 A
0 Frame (45mm)
Panel Mount
Freedom Series
In Stock: 8
On Order: 27
+1 $2,060.597 /ea
+3 $1,998.766 /ea
NEMA Starter
3
Heaters Purchased Separately
110VAC@50Hz| 120VAC@60Hz
1NO
90 A
3 Frame (90mm)
Panel Mount
Freedom Series
In Stock: 20
1 $835.571 /ea
NEMA Starter
3
9-45 A
110VAC@50Hz| 120VAC@60Hz
1NO
45 A
2 Frame (65mm)
Panel Mount
Electronic Overload Relay
Freedom Series
In Stock: 21
On Order: 110
+1 $326.095 /ea
+3 $315.216 /ea
1.6-7 A
3RM Series
In Stock: 13
On Order: 5
+1 $911.031 /ea
+3 $864.072 /ea
+5 $793.001 /ea
NEMA Starter
3
110-120VAC@60Hz| 220-240VAC@60Hz
Panel Mount
45 Degree Wedge Action Contacts| Dual Voltage/Frequency Coil| Gravity Dropout| Molded Coil| Molded Stationary Contact Block| Straight Thru Wiring
Class 14 Series
In Stock: 0
On Order: 7
+1 $320.573 /ea
+3 $310.057 /ea
0.4-2 A
3RM Series
In Stock: 13
+1 $321.321 /ea
+3 $307.164 /ea
2510 Series
In Stock: 8
+1 $1,313.565 /ea
+3 $1,246.784 /ea
Starter
3
110VAC@50Hz| 120VAC@60Hz
45 A
Panel Mount
8536S Series
In Stock: 2
On Order: 12
+1 $5,997.211 /ea
+3 $5,817.284 /ea
NEMA Starter
3
Heaters Purchased Separately
110VAC@50Hz| 120VAC@60Hz
1NO
135 A
4 Frame (180mm)
Panel Mount
Freedom Series
In Stock: 9
+1 $452.672 /ea
+3 $427.526 /ea
NEMA Starter
3
4-20 A
110VAC@50Hz| 120VAC@60Hz
1NO
18 A
0 Frame (45mm)
Panel Mount
Electronic Overload Relay
Freedom Series
In Stock: 12
+1 $1,620.894 /ea
+3 $1,572.274 /ea
NEMA Starter
3
Heaters Purchased Separately
110VAC@50Hz| 120VAC@60Hz
27 A
1 Frame (65mm)
Panel Mount
Wired for Separate Control
A200 Series
In Stock: 5
+1 $1,433.311 /ea
+3 $1,365.023 /ea
NEMA Starter
3
25-100 A
110-120VAC@60Hz| 220-240VAC@60Hz
Panel Mount
45 Degree Wedge Action Contacts| Dual Voltage/Frequency Coil| Gravity Dropout| Molded Coil| Molded Stationary Contact Block| Straight Thru Wiring
Class 14 Series
In Stock: 11
+1 $62.007 /ea
+5 $56.771 /ea
+10 $51.832 /ea
+25 $48.433 /ea
In Stock: 7
+1 $1,409.793 /ea
+3 $1,343.705 /ea
NEMA Starter
3
25-100 A
110VAC@50 Hz| 120VAC@60 Hz
Panel Mount
45 Degree Wedge Action Contacts| Dual Voltage/Frequency Coil| Gravity Dropout| Molded Coil| Molded Stationary Contact Block| Straight Thru Wiring
Class 14 Series
In Stock: 0
On Order: 2
+1 $984.566 /ea
+3 $934.406 /ea
Starter
3
Panel Mount
8536S Series
In Stock: 0
On Order: 18
+1 $339.57 /ea
+3 $328.46 /ea
24 VDC
DIN Rail Mount
Hybrid Motor Starter Series
In Stock: 5
+1 $674.179 /ea
+3 $638.803 /ea
NEMA Starter
3
Heaters Purchased Separately
110VAC@50Hz| 120VAC@60Hz
1NO
9 A
00 Frame (45mm)
Panel Mount
Freedom Series
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