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Bulletin 150 SMC-50 Solid-State Soft Starters

SMC-50 Solid-State Soft Starters

SMC™-50 Solid-state Smart Motor Controllers are available in three frame sizes and range from 180...520 A. This micro-processor based, fully solid-state soft motor starter helps maximize efficiency for motor starts and stops. The SMC-50 motor starter offers many advanced monitoring and protection features to help keep your application running smoothly and ease troubleshooting during downtime. These soft starters are available as part of the Enclosed SMC product family.

  • Overview
  • Product Selection
  • Specifications
  • Software
  • Documentation
  • Resources
  • Applications


  • 90…520 A range
  • Nine standard start modes
  • Rated voltage: 200…690V AC
  • Three expansion ports to install option modules
  • Fully solid-state, continuous SCR control
  • Built-in electronic motor overload protection
  • Current and voltage sensing on each phase
  • Metering
  • DPI Communication Protocol
  • Parameter configuration options
  • Energy saver mode
  • Logging of the last 100 events with time stamp
  • Network communication (option)
  • External bypass as an option
  • Conformally coated PCBs

Additional Information

  • To learn more about how the SMC-50 Soft Starter's unique starting and stopping profiles can meet your application needs, view the Virtual Demonstration. You can examine the construction and features of this soft starter in three frame sizes and in three dimensions. You will be able to peel back the product casing to see what is inside.
  • Our Connected Components solution provides a design toolkit, programming software, and all the right products bundled together to help you more quickly design and develop machines.


SMC-50 Solid-State Smart Motor Controller User Manual150-UM011


  • cULus Listed (Open Type) (File No. E96956)
  • CE Marked per EMC Directive and Low Voltage Directive
  • CCC⋆ 
  • C-Tick⋆ 
  • GOST-R
  • KCC⋆ 
  • ABS

⋆For updated certification status of controllers with 24V DC control power, consult your local Rockwell Automation sales office or Allen-Bradley distributor.

Certifications apply when product is marked. See our Product Certification site for Declarations of Conformity, certificates and other certification details.

Standards Compliance

  • UL 508
  • EN 60947-4-2

Looking for Additional Information?

To find additional product information (CAD drawing files, 3D models, etc.) enter the complete catalog number (including dashes) below.


Use Connected Components Workbench software with Microsoft Visual Studio® technology to program your SMC™-50 Soft Starter products.


Smart Motor Controllers Soft Starters Family Brochure150-BR144
Enclosed Smart Motor Controllers Product Profile150-PP007
Global Short Circuit Current Ratings Product ProfileSCCR-PP003
SMC-50 Solid-state Smart Motor Controller Selection Guide150-SG010
Soft Starter Bypass Technology in Smart Motor Controllers150-WP006
SMC - When to Use a Soft Starter or AC Variable Frequency Drive White Paper150-WP007
ControlFLASH Firmware Upgrade Software User Manual1756-UM105
SMC-50 Solid-state Smart Motor Controller User Manual150-UM011
More Soft Starter publications in Literature LibraryAll Languages

Can’t Find What You Need?

Browse our Literature Library where you can search for additional publications in more languages. You can also use the Advanced Search feature to search by catalog number, publication type, title, or keywords to narrow your results.

Product Certifications

See our Product Certification site for Declarations of Conformity, certificates and other certification details.

Configuration & Selection Tools

  • CrossWorks — Convert competitive catalog numbers to similar Allen-Bradley® products.
  • eCADWorks — Select product 3D-CAD drawings in AutoCAD®. 
  • MCS Star — Configure a Modular Motor Control System.
  • ProposalWorks — Build complete quotes and proposals.

Other Resources

  • Firmware — Obtain firmware for your SMC Soft Starters from the Product Compatibility & Download Center.
  • Flash Update — Flash memory updates for smart motor controllers.
  • HyperTerminal Instructions — Instructions for firmware updates using HyperTerminal.
  • Procurement Specifications — Visit our online resource to find the procurement specifications for this product.
  • SMC Estimation Wizard — Obtain a more advanced analysis of both the device and the system.
  • SMC Thermal Wizard — Conduct simple thermal analysis and selection of an SMC product for a given application.
  • Knowledgebase — Visit our online resource for technical information, support chat and forums, software updates, and product safety advisories/notices.


Watch the following videos to see how our SMC-50™ soft starters are used in the following applications:

Water Pump

The SMC-50 soft starters use new soft start technology to provide torque and speed control for starting centrifugal pumps and high-inertia loads. Through proprietary sensorless speed sensing and motor control algorithms, the SMC-50 soft starter can deliver even smoother pump starts and stops than was possible with previous pump-control methods.

Rock Crusher

The SMC-50 soft starters deliver improved performance on high inertia loads such as rock crushers through linear acceleration technology and torque control. Limiting peak current and torque shock yields consistent starting performances. Through advanced control and monitoring uptime is maximized and the need for system maintenance is reduced.

Band Saw

The SMC-50 soft starters minimize starting peak current and torque shock to the system. Slow speed operation enables inspection of saw blade tracking before the motor is brought to full speed. The Smart Motor Braking option enables the system to stop in a fraction of the time of a coast stop.

Compression Tank

The SMC-50 soft starters use linear start technology which is ideal for both high and low pressure applications such as those found in compression tanks. This soft starter also has an energy saver mode which optimizes energy usage when running lightly loaded motors.