Motortronics Soft Starter Product Ranges

Introduction

Motortronics is a leading manufacturer of high-quality soft starters, trusted across a wide range of industrial applications. Formerly known as Fairford Electronics, the brand builds on decades of engineering expertise and a strong reputation for reliability, performance, and innovation.

With a focus on robust motor control solutions, Motortronics products are designed to reduce mechanical stress, improve efficiency, and extend equipment life.

All Motortronics soft starters include a built-in bypass as well as comprehensive protection features, including overload protection, locked rotor protection, voltage imbalance protection, overvoltage protection and earth fault protection.

At inverdrive.com we stock a wide range of Motortronics Soft Starters ready for next day UK delivery

VMX Synergy Plus

Ideal for complex or critical applications requiring maximum control and protection.

The Motortronics Synergy Plus builds on the Synergy to offer enhanced performance. It is the most advanced soft starter in the range, delivering superior control and protection for demanding applications. Designed for easy set-up and flexibility, it ensures smooth operation while maximising equipment lifespan.

 

VMX Agility

A flexible, general purpose soft-starter for most industrial applications

The Motortronics Agility is a flexible soft starter offering essential I/O for system integration and straightforward keypad operation. It provides a balance of performance and simplicity for general-purpose applications.

 

VMX PFE

A simple, cost-effective solution for basic motor starting requirements.

The Motortronics PFE is an entry-level soft starter with front-mounted analogue adjustment for quick and simple setup. It is designed for basic applications requiring reliable motor starting and essential protection.

 

VMX Synergy

The Motortronics Synergy is an advanced soft starter delivering superior control and protection.

 

Motortronics VMX Soft Starter Comparison Table

Feature	Synergy Plus	Agility	PFE	Synergy
Position in Range	Enhanced advanced model	Mid-range	Entry-level	Advanced model
Current Range	17A to 850A	17A to 361A	1A to 41A	17A to 500A
Voltage Range	208Vac to 600Vac	208Vac to 600Vac	208Vac to 480Vac	208Vac to 480Vac
Controlled Phases	3	2	2	3
Connection Type	Inside-delta or in-line	In-line only	In-line only	Inside-delta or in-line
Keypad	Graphical keypad	Basic keypad	No keypad	Graphical keypad
Pre-programmed Applications	45	23	None	42
Modbus RTU	Yes	Yes	No	Yes
Communication Options	Yes	No	No	Yes
Digital Inputs	4	2	None	3
Relays	5	1	None	4
Analogue I/O	1 AI / 1 AO	None	None	1 AI
Single-Phase Suitability	No	Yes	Yes	No
Highlighted Feature	iERS Energy Saving System (enhanced)	Single-phase suitability	Simple analogue setup	iERS Energy Saving System

 

When should you use a soft starter instead of a VSD?

Soft starters are often the preferred solution where full speed operation is required and variable speed control is not necessary. They provide a simpler, more cost-effective way to achieve smooth motor starting and reliable protection.

• When the motor runs at full speed most of the time
  If there is no need for speed variation, a VSD is often unnecessary. Soft starters provide controlled starting without added complexity.
• When you want a lower-cost solution
  Soft starters are typically more cost-effective than VSDs, with lower upfront cost and simpler installation.
• When you only need to reduce inrush current and mechanical stress
  Soft starters limit starting current and torque, helping to protect motors and connected equipment.
• When simplicity and reliability are priorities
  With fewer parameters and straightforward setup, soft starters enable faster commissioning and easier operation.
• When harmonic distortion needs to be minimised
  Soft starters introduce minimal harmonics compared to VSDs, helping maintain power quality.
• When panel space and heat are limited
  Soft starters are generally more compact and generate less heat, particularly with built-in bypass.
• When retrofitting or replacing DOL or star-delta starters
  They provide an easy upgrade path with minimal system changes while improving motor protection.
• When EMC compliance is a concern
  Soft starters typically avoid the need for additional filters or shielded cabling required with VSDs.

In summary: If variable speed control is not required, a soft starter offers a simpler, more efficient, and cost-effective solution for most motor starting applications.

 

 

Created by Inverterdrive Supermarket Ltd. Last revised April 2026