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

    5 out of 5 based on 2 reviews | Write a review
    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
    30-day Returns
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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.


    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.

    Soft Starter Works with a Bypass Contactor

    Soft starter works with a bypass contactor saving energy by eliminating thyristor losses during the run. The bypass contactor shunts the current flowing through the soft starter switch circuit to reduce heat accumulation in the soft starter power electronics during motor operation. This provides maximum efficiency and prolongs the life of soft-start switching components because they only work during the start and stop cycles of the motor.

    How to Change the Soft Starter Rated Current

    Existing reviews of 50 hp (37 kW) Soft starter, 75 A, 3ph 240v/400v/480v
    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
    Regarding wiring, you can refer to our demonstration video, see on:
    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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