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Combination Motor Starters

Combination motor starters give you an efficient way to contain your motor starter and electrical protection devices within a single enclosure.

You can find our range here, including Square D, Siemens, and Eaton combination motor starters, which cover non-reversing and reversing options and conform with relevant controls and standards such as NEMA and IEC.

What is a combination motor starter?

Motor starters are designed to safely start or stop a motor via an electromechanical switch, similar to how a relay is operated, while also providing motor overload protection. Combination motor starters give you another level of protection. They bring together:

  • The control device also called the contactor
  • Motor overload protection, which prevents motors from overheating
  • A form of short circuit protection

The added short circuit protection within the combination starter allows it to react to certain faults and protect your motor. Without this, a fault current could do permanent damage to your motor and require costly repairs. This short circuit protection will be provided by the inclusion of either:

  • A fused disconnect switch
  • A circuit breaker

All these elements will be housed within a single enclosure, allowing for ease of installation and access by relevant workers during regular operations and emergency situations. 

How does a combination motor starter work?

The general operation of a combination motor starter is almost identical to that of standard motor starters. They safely switch the necessary amount of power going to the motor and prevent it from drawing a current outside of safe parameters.

With the inclusion of short circuit protection in a combination motor starter, your circuit has everything it needs to operate with the appropriate failsafe measures in place. By having a combination motor starter and disconnect switch or circuit breaker, all lines can be opened in the event that a fault occurs in any phase. This can help prevent single phasing, which could otherwise result in voltage imbalance and motor burnout.

A starter can either be manually operated or operated electronically via magnetic components, depending on which is more suitable for your operational needs.

Manual combination motor starters

Manually operated motor starters are easy and straightforward to use. A user simply presses a button or turns a rotary knob to switch the connected motor on or off. This operates the mechanical linkages, opening or closing them to start or stop a motor.

Manual starters can be a preferred choice as they include:

  • Safe, efficient operation
  • Smaller sizes allow them to be suitable for many applications
  • The initial cost for a manual starter is relatively low
  • Circuit breaker/fused switch provides an additional failsafe

Magnetic combination motor starters

Electromagnetic operation of this form of motor starter allows it to be controlled remotely. This can be preferable if you have a larger scale operation. The motor load which is connected to the motor start can also be activated and stopped using a safer voltage.

There are also different types of magnetic combination motor starter which use specific configurations within a circuit, which include:

  • Direct-On-Line (DOL) Starters: A general-purpose starter that uses a magnetic contactor to connect the full voltage of the power supply to the motor. These are used for motors that only need to run in a single direction at a fixed speed.
  • Reversing Direct-On-Line (DOL) Starters: Offering the same utility as standard DOL starters but with the ability to run either forwards or backward. This can be especially useful for conveyer-based machinery where directional control can be needed.
  • Star Delta Starters: A reduced voltage motor that is ideal for when you need longer acceleration cycles and a larger scale. Designed to operate three-phase induction motors, it switches the windings between star and delta connections to start the motor.
  • Soft Starters: Usually used to control AC electric motors. These can help to reduce the torque and load during the start-up phase, as well as electrical current surges.

Why do I need a combination motor starter?

Opting to use a combination motor starter can give you additional peace of mind surrounding your motor circuit security. Although standard motor starters can perform the same process, the advantages of a combination motor starter come through within the enhanced circuit protection devices which are included within a single enclosure.

Because they are supplied with either a circuit breaker or fused disconnect switch, there is built-in short circuit protection for your motor. Not only can it spare your motor from burning out due to a fault current, but combination motor starters give you everything your circuit needs in line with what’s required by Article 430 of the National Electric Code.

Due to the circuit configuration, you will also be able to quickly reset the motor start once the fault has cleared. This means you can minimize the downtime of your motor and get it operational again faster.

Uses for a combination motor starter

  • Water pumps
  • Heat pumps
  • Compressors
  • Conveyor belts
  • Fans
  • Ventilators
  • Blowers

Why get combination motor starters from Allied Electronics?

We’re one of North America’s largest authorized distributors of electronic components, stocking combination motor starters from industry-leading brands and offering you fast and fuss-free delivery. 

Don’t hesitate to get in touch if you have any questions, or check out our expert hub for specialist advice and guidance.

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EATON CUTLER HAMMER S701E03N3S
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SIEMENS US2:49MBRS1
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SQUARE D 8738SBA13V81A1F4T
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In Stock: 2
1 $716.859 /ea
In Stock: 3
+1 $75.042 /ea
+5 $71.225 /ea
In Stock: 0
+1 $1,998.766 /ea
+3 $1,897.28 /ea
In Stock: 0
+1 $1,932.381 /ea
+3 $1,834.239 /ea
In Stock: 0
+1 $573.826 /ea
+5 $562.353 /ea
In Stock: 0
+1 $608.168 /ea
+5 $596.002 /ea
In Stock: 0
+1 $4,178.361 /ea
+3 $4,053.005 /ea
In Stock: 0
+1 $4,887.52 /ea
+3 $4,740.89 /ea
In Stock: 3
+1 $2,049.894 /ea
+3 $1,945.801 /ea
In Stock: 0
+1 $1,983.487 /ea
+3 $1,882.76 /ea
In Stock: 0
+1 $2,741.717 /ea
+3 $2,602.49 /ea
In Stock: 0
+1 $2,925.791 /ea
+3 $2,777.214 /ea
In Stock: 0
+1 $306.68 /ea
+3 $291.104 /ea
In Stock: 0
+1 $347.644 /ea
+3 $329.989 /ea
In Stock: 0
+1 $347.644 /ea
+3 $329.989 /ea
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+1 $306.68 /ea
+3 $291.104 /ea
In Stock: 0
+1 $2,300.386 /ea
+3 $2,183.577 /ea
In Stock: 0
+1 $2,791.173 /ea
+3 $2,649.427 /ea
In Stock: 0
+1 $3,077.404 /ea
+3 $2,921.171 /ea
In Stock: 0
+1 $2,453.726 /ea
+3 $2,329.118 /ea
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