Soft Starters
During direct-on-line starting, an asynchronous motor draws an inrush current that can be 5 to 8 times higher than the rated current. This peak puts stress on power cables, contactors, mechanical transmission components, and the distribution network—accelerating the wear of all these components and causing voltage drops that may disturb other loads connected to the same network.
The soft starter solves this problem at the source: it gradually increases the voltage applied to the motor, controlling the acceleration ramp and limiting the inrush current to manageable values. The result is a smooth start, free of mechanical jerks, with reduced wear and less impact on the grid. Unlike an inverter, the soft starter only operates during the starting and stopping phases—once the rated speed is reached, an internal bypass excludes the device, reducing power losses to zero.
Soft starter or inverter: which one to choose?
The choice between a soft starter and an inverter depends on the application. A soft starter is the most cost-effective solution when the only requirement is to control the motor's starting and stopping—without the need to vary speed during operation. Aninverter, on the other hand, is necessary when you need to continuously adjust speed during the work cycle, which offers corresponding advantages in terms of energy savings. Our technicians are available to help you choose the correct solution for your application.
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