Star and delta in three-phase motors – what they mean and when they are used

What is a star connection?

In a star connection, the windings are connected so that the voltage across each winding is lower than the line voltage.

What is a delta connection?

In a delta connection, each winding is located directly between two phases.

When are they used?

The correct choice depends on the network voltage and the data on the motor's nameplate.

Risk of incorrect connection

Incorrect wiring can cause excessive current, low torque, or damage to the windings.