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Heavy Duty - Soft Starter

3-Phase Motor Soft Starter

Heavy-duty Low Voltage Soft Start 

8-3000A, 220-1,200V


The RVS-DN is a highly sophisticated and reliable three-phase motor soft starter designed for use with standard three-phase, three-wire and six-wire, squirrel cage induction motors. It provides the best method of reducing current and torque during low voltage motor starting.

This heavy-duty three-phase starter starts the motor by supplying a slowly increasing voltage to the system. This provides a soft start and smooth, stepless acceleration while drawing the minimum current necessary to start the motor.

The third generation, microprocessor based digital control provides unique features like pump control, slow speed, electronic reversing and accurate motor protection.

RVS-DN models can be supplied with options for insulation protection, thermistor input in addition to analogue output, and more.

The RVS-DN is a heavy duty, advanced, reliable three-phase starter designed to start the most demanding applications and operate under severe conditions, such as those in Marine and Mining installations. Advanced features such as pump control, slow speed, and electronic reverse and enhanced motor protection make it one of the best and most popular soft starters in the industry.

 Rugged Design & Functionality

  • Soft start and soft stop
  • Soft, stepless acceleration & deceleration
  • Current limiting
  • Torque & current control - for optimized acceleration and deceleration
  • Pump control program
  • Dual adjustment - two start/stop characteristics
  • Slow speed with electronic reverse
  • Pulse start

 The Comprehensive Protection Package Includes:

  • Too many starts & stops inhibit time
  • Long start time (Stall protection)
  • Shear pin (jam) with adjustable delay
  • Electronic overload with selectable curves
  • Under current
  • Phase loss
  • Phase sequence and Under/Over frequency
  • Under/Over voltage
  • Load loss (motor not connected)
  • External fault
  • Shorted SCR
  • Starter over temperature protection
  • Motor insulation test (option)
  • Motor thermistor (option)
  • When using “Preparation for Bypass” all protection remains active



  • Robust construction
  • Highly advanced starting & stopping characteristics
  • User friendly set up and operation
  • Line or Inside delta connection models up to 690V
  • Ambient operating temperature: up to 60°C
  • Motor insulation tester
  • Communication: Modbus, Profibus, DeviceNet
  • Thermistor input
  • Analog output 45-65Hz
  • Auto-tracking frequency range
  • Can be operated without bypass contactor at 50°C up to 820A 
  • Designed to meet Marine Industry standards up to 3000A


  • DeviceNet
  • Modbus
  • Profibus
  • Insulation test
  • Analog output
  • Conformal coating
  • Preparation for bypass contactor
  • Remote display
  • Marine approval (A-C)
  • UL standard (A-C)

* Contact us for more options and details. 

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