Rated Operational Current
8 to 3,000 A
Rated Supply Voltage
220 V – 1,200 V

The ISA D is an advanced and dependable soft starter for three-phase induction motors, supporting both direct (three-wire) and inside delta (six-wire) configurations. It provides an optimal solution for minimizing current and torque during the startup of low voltage motors, even in the most demanding environments like marine and mining installations. With advanced features including pump control, slow speed operation, electronic reversing, and enhanced motor protection, the ISA D stands out as one of the top and most sought-after soft starters in the industry.


  • 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
  • Comprehensive protection package
  • 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)

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