Solcon Solutions USA

SI-DN Low Voltage Soft Starter

Download Brochure

Low Voltage

The starting solution for motors in the most demanding conditions

Rated operational current

17 to 2,700 A

Main Voltage

230V – 1,200V

The SI-DN is a heavy-duty, advanced, reliable Soft Starter designed to operate under severe conditions to start the most demanding applications, such as those in Marine and Mining installations.

Offering a Soft, step-less acceleration & deceleration with advanced features such as pump control, slow speed, and electronic reverse, the SI-DN includes a built-in enhanced motor protection package that makes it one of the best and most popular soft starters in the industry.

Solcon LLC’s SI-DN soft starter has a superior global reputation making it the starting solution of choice even under the most demanding conditions.


Water Mining Process Marine Oil & Gas HVAC
  • Pumps
  • Water Pumps
  • Sewage Pumps
  • Pumps
  • Conveyors
  • Compressors
  • Fans
  • Ball Mills
  • ……And More
  • Pumps
  • Conveyors
  • Compressors
  • Hydr’ Power Packs
  • Mixers
  • ………And More
  • Pumps
  • Chillers
  • Thrusters
  • Propulsion Motors
  • Pumps
  • Compressors
  • Fans
  • Pumps
  • Fans
  • Chillers

Every industry and for any application looks to install a motor that is both robust and high in efficiency. For this reason, most production lines are run by three-phase AC-type motors.

Protecting these motors while they are running with the help of specially developed equipment is essential for worry-free production.

Preventing the high inrush current while starting the motor helps release the stress on the electricity network. It ensures the safe run of the motor which is so vital for the smooth operation of any production line. A soft start that temporarily reduces the torque and load in the power while ensuring a smooth ramp up of the motor prevents potential damage, thus maximizing the motor life span.

  • Robust construction for Marine and Mining applications
  • Up to 140°F ambient temperature
  • Comprehensive protection package
  • Operation without bypass contactor up to 820A
  • Automatic triggering of firing angle (marine, offshore & generator operation)
  • User-friendly configuration & operation

Advanced Features

  • Robust construction
  • Advanced start/stop characteristics
  • User friendly setup and operation
  • Line / Inside delta connection – up to 690V
  • Ambient operating temperature: up to 140°F
  • Motor insulation tester
  • Varied communication options
  • Thermistor input
  • Analog output
  • 45-65Hz Auto-tracking frequency range
  • Can be operated without bypass contactor at 122°F up to 820A
  • Designed to meet Marine Industry standards: up to 2700A

Soft Start / Soft Stop Functions

  • Soft start and soft stop
  • Soft, step-less acceleration & deceleration
  • Current limiting
  • Torque & current control
  • Pump control program
  • Dual-adjustment – characteristics
  • Slow speed with electronic reverse Pulse start

Comprehensive Protection Package

  • Too many starts & start inhibit time
  • Long start time (Stall protection)
  • Shear pin (jam) with adjustable delay
  • Electronic overload with selectable curves
  • Under current
  • Phase loss
  • Phase sequence & 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

Models | 17-2700A, 230-690V

How To Order


SI-DN  –   31A   –   480V   –   230V   –   230V   –   3P

Rated Current
Mains Voltage

480V = 230-480VAC, +10%/-15%, 50/60Hz.
690V = 600-690VAC, +10%/-15%, 50/60Hz.
1000VAC = 1000VAC, +10%/-15%, 50/60Hz.
1200VAC = 1200VAC, +10%/-15%, 50/60Hz.

Control Voltage
230 VAC
Control Input Voltage
3M – Modbus
3P – Profibus
4 – Insulation test
5 – Analog output
8 – Conformal coating
9 – Preparation for bypass contactor
D – Remote display
M – Marine approval
U – UL standard (A-C)