Soft Start

Single-phase and three-phase inverters - soft starters

Inverters are devices designed to control the spin speed of AC motors.

What is the principle of operation of inverters?

These are advanced electronic devices that convert AC voltage to DC voltage first and then convert it back to AC voltage of a different frequency. Thanks to this solution, it is possible to adjust the engine speed from zero to a multiple of the rated speed.

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  • Maximum engine power: 22 kW

SF-220 soft start

SF-220, 5908312597544

Three-phase soft starter.

Input voltage 3 x 400 V
Maximum power 22 kW


The SF soft starters are used to perform a safe boot of three-phase asynchronous squirrel-cage motors. Soft starter eliminates a star-delta systems and drastically reduces the current surge that occurs during start-up of even heavily loaded motors (e.g. mills and grinding machines).

SF-220 soft start

SF-220, 5908312597544

Three-phase soft starter.

Input voltage 3 x 400 V
Maximum power 22 kW


The SF soft starters are used to perform a safe boot of three-phase asynchronous squirrel-cage motors. Soft starter eliminates a star-delta systems and drastically reduces the current surge that occurs during start-up of even heavily loaded motors (e.g. mills and grinding machines).