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Breaker is an on-off device that protects electrical circuits from short circuits and possibly over current conditions, depending on the type of breaker that you select.
VFD is an AC motor controller that does everything that a soft starter does, but also facilitates operation at any speed between zero and maximum for the motor, for an indefinite amount of time.
2) Constant current start, soft starters can be applied current closed-loop control to make the motor current keep constant during starting to ensure smooth start.
3) Adjusting optimized starting current in stepless free according to the load characteristic and the power grid protection characteristic.