# Which of the following applies to an autotransformer starter with a five-pole starting contactor: open transition or closed transition? Locate in Figure 27–3.

### Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

Chapter
Section

### Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 27, Problem 3SQ
Textbook Problem
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## Which of the following applies to an autotransformer starter with a five-pole starting contactor: open transition or closed transition? Locate in Figure 27–3.

To determine

Find the transition that is applied to an autotransformer starter using a five pole starting contactor.

### Explanation of Solution

Autotransformer starters or starting compensators that use a five pole starting contactor are divided as open transition starters. Momentarily, the motor disconnects from the line connections when the state of the motor transfers to the run condition from start position.

The starter includes three-pole (S2) contactor and two-pole (S1) contactor operating independently with each other for the closed transition starter connections...

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