Libratherm Instruments Private Limited
Libratherm Instruments Private Limited
Dahisar East, Mumbai, Maharashtra
GST No. 27AABCL1732A1Z5
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Motor Soft Starters

Motor Soft Starter for Single Phase and Two Phase AC Induction Motor

Three Phase Motor Soft Starter for AC Induction Motor

Three Phase Motor Soft Starter for AC Induction Motor
  • Three Phase Motor Soft Starter for AC Induction Motor
  • Three Phase Motor Soft Starter for AC Induction Motor
  • Three Phase Motor Soft Starter for AC Induction Motor
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Approx. Price: Rs 20,500 / NumberGet Latest Price
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Product Details:

ConfigurationThree phase close delta (In Line) or open delta (Inside Delta)
Relay OutputsFor Bypass relay, Fault Relay (Change over contacts)
Load typeSuitable for both 3 phase squirrel cage Induction motor and Slip ring motor.
Aux Supply Voltage230 VAC +/- 10%, 50/60 Hz. Max-10VA
Size in mm As given in above Model Wise Description
Control ActionPhase angle control (self - synchronized)
Control SwitchesFront panel push button switches for Start/Stop to start and stop the motor. Reset push buttonswitch
Incomer Supply415VAC/440VAC @ 50Hz. (690VAC-optional)
Output0 to 415/440VAC 3 phase variable voltage to achieve full speed in max. 10-20 Sec.
Smooth ControlAdjustable Ramp Up Time for soft Increase of output voltage.
Motor ProtectionMotor protection against over load, phase failure and phase reversal.
SettingsFor adjusting ramp or soft start time and jump start voltage level.
LED IndicationsFor Power ON, External Fault, Bypass, Over load Trip, Top of Ramp.
Mounting TypeScrew Mount, Wall Mount

  • Suitable for 3 phase AC Induction motor up to 205KW (275HP)
  • Semikron make SCR modules (SKKT series)
  • Reduces starting current
  • Motor connection for both 3 wire close delta (In line)
  • and 6 wire open delta (in-side line)
  • User settable jump start and soft start / ramp time
  • Accepts start and stop command from external potential free contact
  • Over load trip facility and built in motor protection
  • Contactor bypass output and Fault output
  • Easy to install and maintain
Model Wise Description:

ModelMotor Ratings (HP) @ 440VACMotor Ratings (KW) @ 440VACMax. Starting Current /Continuous currentStd. Sizes 
(H x W x D) mm
MSS-006(1 to 6) HP(0.75 to 4.5) KW20A / 6.2A255 x 170 x 80
MSS-010(7 to 10) HP(5 to 7.5) KW32A /10.5A255 x 170 x 80
MSS-015(11 to 15) HP(8 to 11) KW45A /15A255 x 170 x 80
MSS-020(16 to 20) HP(12 to 15) KW55A / 18A315 x 180 x 240
MSS-035(21 to 35) HP(16 to 26) KW75A / 36A315 x 180 x 240
MSS-050(36 to 50) HP(27 to 37) KW110 / 50A315 x 180 x 240
MSS-075(51 to 75) HP(38 to 55) KW150A / 75A385 x 200 x 240 
MSS-110(76 to 110) HP(56 to 82) KW230A / 115A425 x 285 x280
MSS-150(111 to 150) HP(83 to 111) KW310A / 155A450 x 355 x 355
MSS-200(151 to 200) HP(112.5 to 147) KW410A / 205A450 x 355 x 355
MSS-225(198 to 225) HP(147.5 to 168) KW470A / 235A450 x 355 x 355
MSS-275(226 to 275) HP(170 to 205) KW570A / 300A450 x 355 x 355

A motor soft starter is a device used with AC electrical motors to temporarily reduce the load and torque in the power train and electric current surge of the motor during start-up. This reduces the mechanical stress on the motor and shaft, as well as the electrodynamic stresses on the attached power cables and electrical distribution network, extending the lifespan of the system.

To gradually accelerate the speed of AC 3 phase induction motor it is required to feed increasing voltage to the motor and such behavior is only possible by connecting SCRs in series with the motor.   The SCRs are controlled by MSST-15 firing card to generate the firing pulses giving the effect of soft start. Libratherm offers ready to use motor soft starter MSS-XX for 3 phase induction motor. User has access to set the starting voltage to create the torque and to set the soft start time. For over load trip, the feedback it taken from internal CT to monitor the load current and to generate the trip contact in case of over load condition. Once the motor achieves full RPM, it is not required to pass the current through the SCRs and hence these SCRs can be bypassed using external bypass contactor.

Additional Information:

  • Item Code: MSS-106
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Kamlesh Panchal (Managing Director)
Libratherm Instruments Private Limited
No. 401-403, Diamond Industrial Estate, Ketki Pada Road
Dahisar East, Mumbai - 400068, Maharashtra, India
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