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Soft Starter Motor Units

Ralspeed provide fully enclosed soft starter motor units, designed and built to bespoke specifications to suit the individual requirements of any application. We also provide fully enclosed inverter panels, designed and built to bespoke specifications to suit the individual requirements of any application.


2 Phase Control Soft Start


  • soft acceleration and deceleration
  • potential-free control input for soft acceleration
  • and deceleration
  • 3 separately adjustable parameters
  • accel. time, start voltage, decel. time
  • boost-start selectable
  • potential-free relay output for operating state
  • unit bypassed — and failure (optional)


  • two-phase controlled soft starter
  • controlled by microcontroller
  • optimized soft start
  • current and torque reduction during acceleration
  • easy mounting, for snap-mounting on 35mm standard rail
  • integrated bypass relay
  • parameterization by means of three potentiometers
  • no additional control voltage required
  • no mains neutral conductor (N) required
  • economically priced substitute for star-delta starters
  • compact design, 45mm
  • degree of protection IP20

3 Phase Control Electric Soft Start

Our own manufactured soft starters - Torq-master - are supplied either with or without Bypass Contactor and are designed for a power range of between 11 and 500Kw. The Chassis Version has a 2-line LCD display and 1000-event data log for easy analysis and has an option of control voltages to suit any application. Both voltage and current can be accurately controlled while programmable relays and automatic turnoff facilities make the unit safe and easy to use.

  • User friendly keypad programming
  • Choice of starting / stopping modes
  • Two line alphanumeric display
  • Comprehensive fault and condition monitoring
  • Optional door mounting keypad
  • Power range 7.5kw – 800kw – integrated bypass contactor or supplied by user
  • 1000 event data log
  • Built-in earth leakage detection (optional extra)
  • Minimal heat loss due to bypass function
  • Built-in time clock
  • 5 Programmable inputs
  • 2 Programmable relays