The soft-starting device is an electronic control for the soft startup of one-phase asynchronous machines. A phase control causes the current to rise steadily. This also increases the motor torque and the drive starts up smoothly. The starting current is minimized. There is no speed adjustment. There is no marked soft start behavior without a mechanically connected load.

If the power semiconductor is to be protected against short circuits or ground faults during startup, a super quick fuse must be installed. In the case of high switching frequencies, we recommend installing a thermistor motor protection for monitoring the permissible motor temperature.

The soft-starting device must not be operated with capacitive load. Can be retrofitted in existing plants at any time.