isa sl


isa sl
Rated Operational Current
17 A to 1,100 A
Rated Supply Voltage
208 V – 690 V

The ISA SL3 from IGEL Electric is an advanced low-voltage soft starter featuring integrated bypass and 3-phase control. This state-of-the-art device offers optimal soft start and soft stop characteristics, making it the ideal solution for a wide range of applications. Its comprehensive motor protection package ensures long-term reliability, and the built-in bypass guarantees superior performance, all within a compact and versatile design.

User-friendly and straightforward to commission, the ISA SL3 soft starter boasts acceleration control, current limiting on every start, and five adjustable curves tailored for pumps, generators, and other standard torque-controlled applications.


  • Soft start and soft stop
  • Kick start
  • Restart delay (3 sec)
  • Under voltage
  • Phase sequence
  • Shear-pin current
  • Under current
  • Overload classes (IEC, NEMA)
  • Current imbalance
  • Ground fault
  • Excessive number of starts
  • Excessive starting time
  • Soft starter over temperature
  • Programmable external fault
  • Phase loss
  • Inside delta wrong connection alarm


  • Universal Interchangeable Control Module
  • Multi-language user interface
  • Real-time, online, 99 event and trip log (including currents, voltages)
  • Optimized for high efficiency motors (IE3)
  • 2-phase mode for on-site phase fault operation
  • Basic, professional and expert set-up menus
  • User defined metering and monitoring of 3-phase voltages, 3-phase currents and power factor
  • USB interface for setup and software updates
  • Option cards include Analogue Output Including Thermistor, three Thermal Sensors, Motor Insulation Monitor
  • Auto reset for selected faults
  • Low voltage soft starter with 3 Thermistor inputs
  • Frequency auto tracking 45-65 Hz
  • Inline and inside delta connection
  • 3 Current transformers


  • Remote Keypad
  • Analog output
  • Modbus
  • Profibus/Profinet
  • DeviceNet
  • Analog output
  • 3xRTD thermal sensor
  • 2-phase control
  • Motor insulation monitor
  • Conformal coating

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