Automatic star-delta starters

Special Features

• Inrush current limiting when starting asynchronous motors
• Reduction of the starting current to one-third of the value during direct starting
• Optimal, operator-independent ramp-up time for your application
• Drive- and grid-friendly starting
• Various designs available
• Control panel can be placed externally

Automatic star-delta starters are used for asynchronous motors from 4 kW to prevent unacceptably high starting currents during startup. The advantage over manually operated star-delta starters is that these starters feature control logic or can be manually actuated, allowing the ramp-up time to be optimally adjusted to the specific application.

The starting process is implemented with a contactor control, a special time relay (KLIBO Star-Delta Timer), and an integrated overload relay. By adhering to important switching sequences and locking of the control, high operational safety is achieved.

The switching time should be set so that when switching from star to delta, at least 80% of the rated speed is reached. A motor suitable for star-delta starting must have a voltage output of 380V / 660V at a line voltage of 380V or delta 380V. For connection, motors with 6 lead-out winding ends are required.

These star-delta starters are used in machine tools, woodworking machines, compressors, and much more. Furthermore, these starters can also be implemented with our new brake controls.