## Introduction

A typical manufacturing environment utilizes electrical motors of one type or another. Many of these motors are high-voltage, 3-phase motors that are controlled using a magnetic motor starter. These motor starters are essentially electrically operated switches that also provide overload protection for the motor.

In this module, you will learn about motor starters and contact relays, and how they are used to control the operation of a motor. You will take what you have learned about logic functions in Module 2 to design and wire various circuits that control a motor starter.

## Objectives

- Describe the operation of motor starters and contact relays.
- Identify the components found in a motor starter.
- Differentiate between the control side and power side of the motor starter.
- Identify an overload and understand its function in a motor control circuit.
- Identify auxiliary contacts and understand their function in a motor control circuit.
- Create circuits in Automation Studio that control a motor starter.
- Wire up circuits on the trainer that control a motor starter.
- Describe the function and logic of the circuits that you create.
- Understand the concept of a latching or seal-in circuit.
- Understand the difference between a run circuit and a jog circuit.

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