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50 hp (37 kW) Soft starter, 75 A, 3ph 240v/400v/480v

5 out of 5 based on 3 reviews | Write a review
$479.12
Inexpensive 50 hp soft starter, 37 kW three phase 240v, 400v, 480v for selection, make induction motor in soft start & soft stop, sell by manufacturer directly.
SKU: GS-037
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Delivery date: 2-3 days

50 hp soft starter, 37 kW three phase 240v, 400v, 480v, 690v AC motor starter for selection.

Model GS2-037 (220v, 240v), GS3-037 (380v, 400v, 415v), GS4-037 (460v, 480v), GS6-037 (575v, 690v).
Capacity 50 hp (37 kw)
Current 75 amps at 380v/480v, 150 amps at 220v
Weight 5 kgs
Dimension 270*146*160 mm
Input Voltage Three-phase 230v, 380v, 460v, 690v AC
Frequency 50Hz/ 60Hz
Adaptive Motor Squirrel-cage three-phase asynchronous motor
Starting Times It is recommended not to exceed 20 times per hour.
485 Communication DB9 interface, male plug, ① is RS485+, ⑥ is RS485-
Control Mode
  1. Operation panel control.
  2. Operation panel + external control.
  3. External control.
  4. External control + COM control.
  5. Operation panel + external + COM control.
  6. Operation panel + COM control.
  7. COM control.
  8. No start or stop operation.
Start Mode
  1. Current-limiting to start.
  2. Voltage ramp to start.
  3. Torque control + current-limiting to start.
  4. Torque control + voltage ramp to start.
  5. Current ramp to start.
  6. Voltage current-limiting double closed-loop start.
Stop Mode
  1. Soft stop.
  2. Free stop.
Protective Function
  1. Open loop protection for external instantaneous stop terminals.
  2. Over-heat protection for soft starter.
  3. Protection for too long starting time.
  4. Input open phase protection.
  5. Output open phase protection.
  6. Unbalanced three-phase protection.
  7. Starting over current protection.
  8. Running overload protection.
  9. Under voltage protection for power voltage.
  10. Overvoltage protection for power voltage.
  11. Protection for fault parameter setting of the soft starter.
  12. Load short circuit protection.
  13. Auto restart or incorrect wiring protection.
  14. Incorrect wiring protection of external control stop terminals.
Ambient Place to be used Indoor location with good ventilation free from corrosive gas and conductive dust.
Altitude Below 1000M. It has to increase the soft starter rate power when the altitude is more than 1000M.
Temperature -30 +55 oC
Humidity 90%RH without dew condensation.
Vibration <0.5G
Structure Enclosure IP 20
Cooling Natural wind cooling.

Details

37KW Soft Starters Details

Tips: Soft starter installation methods

  1. The soft starter should install indoors in accordance with the shell protection level (usually IP20) requirement.
  2. Should install vertically, in the top and bottom of the soft starter should leave space at least 200mm width to facilitate heat dissipation.
  3. If the control cabinet is equipped with thermal relay, should use segregation board to prevent cold or hot airflow blowing to the thermal relay, to avoid affecting the action value of the thermal relay.
  4. Carefully read the instructions to understand the function of each terminal, ensure correct wiring.
  5. Usually don't use megger test the phase and relative to the ground insulation resistance. If it is necessary, must let three-phase input and output short circuit, and unplug all the plugs on the control panel, and then testing.
  6. When the soft starter input connects to the power supply, the output will bring a high induction voltage when the load opens circuit or loss of phase. So when in installation, commission, maintenance and use, prohibit contacting the soft starter output terminal, so as not to causing electric shock accident.
  7. If soft starter connects compensation capacitors to improve the power factor, the capacitor must connect to the soft starter input terminal, not output terminal, otherwise it will cause damage to the soft starter.
  8. The soft starter input and output terminals can't be connected reversely, otherwise it may cause damage to the soft starter and motor.
  9. If the soft starter has bypass contactor, carefully wiring (connect the contactor main contact) , can't cause short-circuit accident.
  10. When measure the motor insulation resistance, must disconnect the three lines between soft starter before proceeding.

Existing reviews of 50 hp (37 kW) Soft starter, 75 A, 3ph 240v/400v/480v
Use large-sized devices
I plan to use a greatly oversize unit to be certain that I can make the required number of reversals for one part of the application that could exceed your 20/hour limit. Since your unit is not fan cooled and the larger sizes are a tolerable price. If necessary, I could provide a little forced ventilation.
From: Biente | Date: 12/01/2025
Was this review helpful? Yes No (0/0)
ATO Responded
We do Not recommend frequent soft start for more than 20 times. Because this may cause the internal thyristor to heat up severely and damage, even if an external fan is added for cooling. So if you want to start the motor frequently, would you consider using a VFD to control the motor? VFD can increase the capacity and have its own fan for cooling. It would be better if you can provide us with a picture of the motor nameplate label and tell us what the load is that is driven.
50hp 480V soft starter
We purchased a 50hp 480V soft starter last year and finally got around to installing it.
Upon start up it powered up and started the motor but would shut off after about 20-30 seconds.
We tried several different settings but could not get it to remain running
The application is a submersible motor and turbine pump.
The motor is 40Hp
Any help or guidance is appreciated
From: Oliver | Date: 06/11/2023
Was this review helpful? Yes No (0/0)
ATO Responded
We need your feedback on the following information to better support you:
1. Please send us the nameplate pictures of the soft start and motor. And tell us how far away is the submersible motor from soft start?
2. Please send complete wiring pictures of our soft starter and motor.
3. Please provide us with a video to confirm how the soft start operation works. What is the fault code that occurs during operation? You can send us the large video file via wetransfer.com.
Regarding wiring, you can refer to our demonstration video, see on: https://www.youtube.com/watch?v=GkSo1DOBHlM
Control method of 50 hp soft starter
Can I start your 50hp soft starter remotely with a 120 volt switch?
From: Jules | Date: 17/05/2021
Was this review helpful? Yes No (0/0)
ATO Responded
Yes, sure. This soft starter remote control can be done via (wires + switch), therefore, you can use 120V to control a relay, and then control the start and stop of the soft starter through the contact switch of the relay. It is a very simple control method.
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