Electric Motor Control Basics - Book - Page 17
Industrial Control Basics: Part 1, Contactors
Star Delta Electric Motor
Industrial Control
Basics:
Part 1, Contactors
Industrial Control
Basics: Part 2,
Overload Relays
Industrial Control
Basics: Part 3,
Starters
The Benefits of Type E/F
Motor Protection
Circuit Breakers
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
Summary
A contactor is a special type of relay used for switching an electrical circuit on or off.
They are most commonly used with electric motors and lighting applications. The use of
a contactor provides a level of isolation away from the high electric currents associated
with those applications, protecting workers and equipment. IEC Contactors are smaller
and are offered in a wide variety of sizes, whereas NEMA contactors are larger and
designed with safety factors that go beyond design ratings by up to as much as 25%. IEC
is a Global standard. NEMA contactors are primarily used in North America however,
more companies are adopting IEC Contactors, c3controls specializes in IEC.
Applying Motor Control
in a Wastewater
Application
NEMA vs IEC Motor
Controls
Understanding
IP Ratings
17
