# Star-Delta Connection: Understanding Three-Phase Motor Starting

**URL:** <https://forumautomation.com/t/star-delta-connection-understanding-three-phase-motor-starting/14336>\
**Category:** Electrical\
**Tags:** switchgear\
**Created:** [August 21, 2026, 2:38pm UTC](https://forumautomation.com/t/star-delta-connection-understanding-three-phase-motor-starting/14336 "2026-08-21T14:38:08Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rabert](https://forumautomation.com/user_avatar/forumautomation.com/rabert/32/6784_2.png) [@Rabert](https://forumautomation.com/u/Rabert)\
**Post date:** [August 21, 2026, 2:38pm UTC](https://forumautomation.com/t/star-delta-connection-understanding-three-phase-motor-starting/14336/1 "2026-08-21T14:38:08Z")

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A Star-Delta starter is used with suitable three-phase induction motors to reduce the starting current by initially connecting the motor windings in Star and then changing to Delta (A) for normal operation.

The basic sequence is:

Start

Star connection

Transition Delta

connection

Normal running

A typical Star-Delta control system involves components such as:

Contactors

Timer

Overload relay

Start/Stop push buttons

Motor

Control and power circuits.

 ![file_00000000c2488211a15c5749dfb0e909](https://cdn.forumautomation.com/original/2X/a/ae47c2bcc91c95c717ec2fa6a454706c3b0c1328.jpeg)