Electric Motor Control Basics - Book - Page 8
Industrial Control Basics: Part 1, Contactors
As their name implies, double break contacts can open the circuit in two places at
the same time. Thus, even in smaller spaces, it allows you to work with more current.
Double break contacts divide the connection in such a way that it forms two sets of
The switch or button of the manual controller is not operated remotely and is
attached to the controller physically.
The power circuit is engaged once the manual controller is activated by an operator.
Once activated, it carries the electricity to the load. Soon, manual contactors replaced
knife blade switches completely, and even today different variations of these types of
contactors are being used.
3. Magnetic Contactor
The magnetic contactor does not require human intervention and operates
electromechanically. This is one of the most advanced designs of a contactor, which
can be operated remotely. Thus, it helps eliminate the risks involved in operating it
manually and putting operating personnel in potential danger. Only a small amount
of control current is required by the magnetic contactor to open or close the circuit.
This is the most common type of contactor used in industrial control applications.
Part 1, Contactors
Basics: Part 2,
Basics: Part 3,
The Benefits of Type E/F
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
Applying Motor Control
in a Wastewater
NEMA vs IEC Motor