500 hp (400 kW) Soft starter, 800 A, 3ph 400v/440v/480v

500 hp (400 kW) Soft starter, 800 A, 3ph 400v/440v/480v

500 hp (400kW) three phase soft starter for sale online, available in 800A current and 380V, 400V, 440V, 460V, or 480V optional voltage. This AC motor soft starter reduces starting current and minimizes mechanical shock when starting a motor.

SKU: GS400

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Delivery date: 6-25 days

Overview

High capacity 500 hp soft starter is designed to control motor soft starting and soft stopping. Factory price 400kW 3 phase 380V, 400V, 440V, 460V, or 480V AC motor soft starters are available online.

Model			GS3-400 (380v, 400v, 440v), GS4-400 (460v, 480v)
Capacity			500 hp (400 kw)
Current			800 amps
Weight			45 kgs
Dimension			590330245 mm
Input	Voltage		Three-phase 240v, 400v, 480v, 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			Operation panel control. Operation panel + external control. External control. External control + COM control. Operation panel + external + COM control. Operation panel + COM control. COM control. No start or stop operation.
Start Mode			Current-limiting to start. Voltage ramp to start. Torque control + current-limiting to start. Torque control + voltage ramp to start. Current ramp to start. Voltage current-limiting double closed-loop start.
Stop Mode			Soft stop. Free stop.
Protective Function			Open loop protection for external instantaneous stop terminals. Over-heat protection for soft starter. Protection for too long starting time. Input open phase protection. Output open phase protection. Unbalanced three-phase protection. Starting over current protection. Running overload protection. Under voltage protection for power voltage. Overvoltage protection for power voltage. Protection for fault parameter setting of the soft starter. Load short circuit protection. Auto restart or incorrect wiring protection. 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

280kW Soft Starters Details

Tips: Why do we need soft starters?

The soft starter is essential because directly starting a large motor creates a massive inrush current—5 to 8 times the motor's full-load current—which causes a significant voltage dip on the electrical network, disrupting other equipment operating on the same power supply. Simultaneously, the immediate application of full torque delivers a sharp mechanical shock to the driven load, such as pumps, conveyors, or fans, violently jerking gears, belts, and shafts, which accelerates wear and can lead to premature failure. The soft starter eliminates this dual problem by gradually ramping up the voltage and torque, transforming a damaging, abrupt start into a smooth, controlled acceleration that protects both the electrical system and the mechanical equipment.