Motor Control Solutions for Industrial and Material Handling Equipment

Our name, PE®or Power Electronics® International, Inc.® is synonymous with quality, heavy-duty VFDs and motor control equipment.

Smooth-Move® 1 (Single-Speed Models)

Top view of a Smooth-Move® 1 (“S” frame size).

Single-Speed A.C. soft-start models; reduced torque control.

For use with single-speed, 3-phase A.C. inductor motors. Soft-starting; reduced torque control.

Available Models by Voltage (+/- to open/close)

Model (Click to view product page)Max HP (kW) @ 208-230VACMax HP (kW) @ 460VACMax Amps (FLA)DimensionsSelect Control Voltage and Line Frequency Options
SM4A1S1 HP (0.75 kW)2 HP (1.5 kW)4.0 A4 × 3.75 × 3.375 in
SM5A1S1.5 HP (1.1 kW)3 HP (2.2 kW)5.0 A4 × 3.75 × 3.375 in
SM8A1L2.5 HP (1.8 kW)5 HP (4 kW)8.0 A5 × 5 × 3.625 in
SM10A1L3 HP (2.2 kW)6 HP (4.5 kW)10.0 A5 × 5 × 3.625 in

Select from these models if 575V is needed.

Model (Click to view product page)Max HP (kW) @ 208-230VACMax HP (kW) @ 460VACMax HP (kW) @ 575VACMax Amps (FLA)DimensionsSelect Control Voltage and Line Frequency Options
SM4A1L571 HP (0.75 kW)2 HP (1.5 kW)3 HP (2.2 kW)4.0 AN/A
SM5A1L571.5 HP (1.1 kW)3 HP (2.2 kW)3 HP (2.2 kW)5.0 AN/A
SM8A1L572.5 HP (1.8 kW)5 HP (4 kW)5 HP (4 kW)8.0 AN/A
SM10A1L573 HP (2.2 kW)6 HP (4.5 kW)7.5 HP (5.5 kW)10.0 AN/A

About the Smooth-Move® 1 Models:

Upgrade your crane with smooth starting, reversing, and jogging; as well as more precise spotting and inching. Through the control of all 3 phases for reduced mechanical and motor stress, you can practically eliminate breakage and wear on drive trains, gearing, belts, etc. The Smooth-Move will help increase the life, reliability, and productivity of new or existing motorized equipment such as Conveyors, Overhead Crane Bridges/Trolleys, Monorails, Textile Machines, Turntables, Bottling Equipment, Palletizers, Overhead Doors, etc.

Smooth-Move® Single Speed A.C. soft starts can replace resistor ballasts, timers, fluid couplings, inductors, and other electrical and mechanical systems used to “cushion start” 3-phase induction motors. Our motor controllers can be used with single or multiple motors up to the total full load amperage rating of the model (see tables above). Smooth reversing is accomplished with a reversing contactor.

The Smooth-Move 1 and Micro-Start® allow you to adjust the starting TORQUE of the motor, along with the length of TIME to reach full motor torque. With these two adjustments it is possible to softly control the starting characteristics of the motor (see comparison graph of motor starting characteristics with, and without the Smooth-Move 1 installed). Instead of a harsh instantaneous inrush current, the control will gently adjust the motor up to full line voltage.

ARC-ELIMINATION™ is an exclusive feature of the high-reliability Power Electronics soft-start controls. This feature eliminates the destructive arcing on the make & break of power contactors. With the Smooth-Move installed, the life of your contactors will be extended up to their mechanical limit, and IEC style contactors can now replace the more expensive NEMA style contactors in many applications. Additionally, the control will have very high reliability in tough applications. Only available from Power Electronics Intl.!

Product Features

  • Takes the “kick” out of 3-phase motor starting.
  • Phase loss protection on input.
  • ARC-ELIMINATION™ on contactor make-and-break extends contactor life up to the mechanical limit.
  • Automatic UNIVERSAL VAC selection: 208, 230, 385, 415, 440, 480, VAC in one unit (200 and 575VAC also available)
  • 110VAC Control Voltage input is standard – all other voltages available upon request
  • Unit is the size of a small contactor
  • TIME and TORQUE settings for motor softness.


  • Easy to install and run
  • Use with reversing and non-reversing systems
  • Extend contactor life up to their mechanical limit
  • Higher reliability
  • Saves $ on machinery life and productivity

Important Notes

For two-speed A.C. motor soft-start control, view the Smooth-Move 2 series.

For soft-start applications with higher full-load-amp requirements (75HP+), view our BT Series of soft-starts.

Once you find the right Smooth-Move for your application, let us build you a completely customizable and turnkey control panel for your project! Call us today for a quote, or start your project here.

Meets FAR Buy American Act (BAA) USC41


  • Listed for U.S. and Canada

Product Downloads


If you have a single-speed or two-speed 3-phase motor, make sure you are looking at the corresponding single-speed or two-speed control unit models. Standard Smooth-Move torque controllers can be used at nearly any 3-phase voltage (208 – 460VAC). Models ending with “57” have an extended voltage range of 208 – 575VAC. The controller can be used with single or multiple motors up to the total full load amp rating of the model. Use the product tables above to find the model that meets the FLA rating requirement of your motor(s). If your application requires higher amperage ratings than those listed here, view our BT Series of soft-starts.

If you are looking to reduce wear on your motor and connecting components due to starting “kicks”, a Smooth-Move® soft-start is a good economical option. However, as the name implies, a soft-start only helps with motor “starts”.

The Smooth-Move controller is not intended for use in hoisting applications – VFD or closed-loop motor control is required in these applications. Also, if you need to control your motor speed while running, if you need to control the deceleration of your motor, or if you need your system to be capable of more advanced programming, a VFD will likely be a better upgrade option. View our line-up of Micro-Speed products here.

Contact PE if you require any further help with selecting the correct soft-start or VFD for your application.