ABB Soft Starters – Created to Increase your Motors Lifetime

ABB’s PSTX, PSE and PSR Ranges of Soft Starters have been designed to help increase your motor’s lifetime by protecting it from the continual stresses caused when starting. This is done by letting you optimise your motors starting currents, which with conventional starting methods applies lots of stress on the motor and the associated electrical network.

The dependable and field proven PSTX, PSE and PSR Ranges of Motor Starters are packed with innovative built-in motor protection features to ensure that your installation is kept safe. These capable Soft Starters are also installation-friendly and easy to use, cutting your assembly and start-up time considerably. With everything that you need in one unit, from bypass contactor to overload protection, a single Soft Starter makes for a compact complete and cost-effective Motor Starting solution.

Furthermore, with many application specific features, such as torque control and pump cleaning these Soft Starters can ultimately help you increase productivity, throughput and much more than simply Soft Starting. These Starters are ideal for numerous industrial and commercial motor starting applications from processing line conveyor systems to liquid pumps found in food and beverage installations.

Main benefits

  • Secure motor reliability
  • Improve installation efficiency
  • Increase productivity, reduced down time


  • ABB’s Soft Starters cover any motor application from 3 A to 2160 A
  • Reduced starting current and less stress on the motor and the electrical network
  • Fast and easy to install and set-up with a small footprint
  • Reduced mechanical wear and tear on equipment


PSTX – Advanced Soft Starter Range

soft Starters PSTX

The PSTX combines many years of research and product development with extensive knowledge of application specific requirements and needs. The PSTX is ABB’s latest advancement in motor control and protection and adds new functionality with increased reliability to any motor starting application. A complete alternative to any motor starting applications with built-in Modbus RTU interface and Anybus modules that support all common communication protocols.



PSTX Motor Starter benefits

  • Secure motor reliability
  • Improve installation efficiency
  • Increase application productivity

PSTX Main features

  • Three-phase controlled
  • Operational voltage 208-690 V AC
  • Wide rated control supply voltage 100-250 V, 50/60 Hz
  • Rated operational current 3-1250 A (inside delta: 2160 A)
  • Coated circuit boards
  • Torque control for excellent control of pumps

View the Range


PSE – Efficient Soft Starter Range

soft starters PSE

The new generation PSE is a true general purpose Soft Starter with advanced features such as torque control to eliminate water hammer. A true universal motor starter, offering the perfect balance between a high start-up performance and cost efficiency with a built-in Modbus RTU interface for advanced communication.





PSE Motor Starter Benefits

  • Advanced motor safety with built-in motor protection
  • Fast and easy set-up with illuminated, language-neutral display
  • Eliminate water hammering with torque control
  • Reduce energy losses with built-in bypass
  • Built-in Modbus

PSE Series Features

  • Rated operational current – 18 to 370 A
  • Operational voltage 208–600 V AC
  • Control supply voltage 100–250 V AC

View the Range


PSR – Compact Soft Starters

soft starters PSR

The PSR Soft Starter range is ABBs most compact unit, a simple yet reliable starting solution that utilises only the most basic of soft starting features: soft start and stop. An excellent performer, with a built-in bypass that is ideal for applications that require many starts per hour (up to 100) and is perfect for installations where space is limited. An ideal motor starting solution for small motor installations.



PSR Motor Starter benefits

  • Small and compact motor starting solution
  • Can perform up to 100 starts per hour
  • Reduce energy loss at full speed with built-in bypass

PSR Main features

  • Rated operational current 3 to 105 A
  • Operational voltage 208–600 V AC
  • Control supply voltage 24 V AC/DC or 100–240 V AC

 View the Range


All of the Motor Starters above are available from Kempston Controls. As an ABB supplier partner we have access to their entire range of Motor Starters and ancillary equipment with expedited delivery. Call us today on +44 (0) 1933 411 411 and speak to one of our Sales or Technical team members who will be more than happy to discuss the options available. Alternatively you can email us at or use this contact form.


Have you read these articles?

Power Plugs and Sockets

Food and Beverage Manufacturing

Kempston Controls

Soft Starter issue? The Siemens Sirius 3RW5 Range is the Solution…

The Siemens Sirius 3RW5 range of soft starters, with their intelligent functions, offers the perfect soft starter alternative for almost any application, from simple installations to sophisticated drive requirements such as heavy-duty starting. These dependable soft starters allow you to start three-phase motors easily, reliably and smoothly. Packed with features the 3RW5 soft starters provide a range of features including automatic parameterisation, pump cleaning, and condition monitoring, making these soft starters ideal for pumps, compressors, fans, conveyors, wastewater systems and for applications the food and beverage industry.

Versatile, the Siruis 3RW5 range encompasses all of the performance classes up to 1,200 kW, ideal for a multitude of industrial applications a few examples are summarised below.

Compressor – Condition Monitoring
Designed to excel, you can evaluate the electrical data and motor active power of the soft starter, giving you the ability to condition monitor your equipment’s status. You can assess if a pump is running dry or a bearing is showing signs of fatigue and damage.

Conveyor Belt –  Automatic Parameterisation
The soft start-up of conveyor belts must constantly adjust to new conditions as the starting weight changes. Using the 3RW5 auto-parameterisation function the soft starter identifies the load conditions and sets the appropriate values for optimally starting.

Sawmills – Integrated Braking
Heavy saw blades used in industrial sawing installations need a soft starting function to protect electrical and mechanical systems and you need to be able to stop saw blades quickly, the 3RW5 soft starters automatically supports DC braking and reverse braking.

soft starter application

Wastewater – Pump Cleaning
In wastewater applications, dirt and particles can be deposited on the pump blades reducing capacity. The pump cleaning function prevents this; integrated measurement technology detects the dirt and changes the direction of rotation as soon as limits are exceeded.

Water Supply – Pump Stop
Shutting down water pump systems can be challenging, pumps in these installations can stop immediately resulting in water hammer in pipes, couplings and valves. To prevent damage the 3RW5 range of soft starters have a pump-stop function that makes it possible to bring pumps to a controlled stop.


SIRIUS 3RW55 High Performance Soft Starter

soft starter 3RW55The intelligent SIRIUS 3RW55 soft starter masters difficult start-up and stopping processes, integrated smart functions including pump cleaning, pump stop, automatic parameterisation and condition monitoring.

• 3-phase control for optimal motor starting
• Engineering in TIA Portal
• Various bus connections (PROFINET, PROFIBUS, Modbus)
• Integrated operator panel with display
• For drives in performance classes from 5.5 to 1,200 kW





SIRIUS 3RW52 General Performance Soft Starters


soft starter 3RW52The SIRIUS 3RW52 soft starter is the ideal alternative to star-delta starters. As an all-rounder, it’s applicable for any type of drive.

• 3-phase control for optimal motor starting
• Parameterisation over rotary setting elements
• Various bus connections (PROFINET, PROFIBUS, Modbus)
• Operator panel with optional display
• For drives in performance classes from 5.5 to 560 kW






Stacked with features and cutting edge functionality the Siemens Sirius 3RW5 range is the go-to-solution for all of your soft starting requirements. At Kempston Controls we have access to the entire 3RW5 range and with our expert technical and sales teams we can help you choose the perfect solution to your soft starting conundrum. Give us a call on +44 (0) 1933 411 411 or email Sales at to discuss your requirements today!

Enquire Now

Have you read these?

Charged Components

Turn it up!


Kempston Controls