Electric Motor Control Basics - Book - Page 7
Industrial Control Basics: Part 1, Contactors
In spite of doing several mechanical improvements, the knife blade switch couldn’t be
fully developed due to the pertaining problems and risks of dangerous operation and
short life of the contacts.
2. Manual Controller
Since the knife blade switch became potentially dangerous to use, engineers came up
with another contactor device, which offered a number of features that were missing
in the knife blade switch. This device was referred to as a manual controller. These
features included:
• Safe to operate
• Non-exposed unit, which is properly encased
• Physically smaller size
• Single break contacts replaced with double break contacts
Double Break Contactors
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
Applying Motor Control
in a Wastewater
Application
NEMA vs IEC Motor
Controls
Understanding
IP Ratings
07
