Electric Motor Control Basics - Book - Page 4
Industrial Control Basics: Part 1, Contactors
Contactor Components
The following three are crucial components of the contactor:
1. Coil or Electromagnet: This is the most crucial component of a contactor. The
driving force that is required to close the contacts is provided by the coil or
electromagnet of the contactor. The coil or electromagnet and contacts are
protected by an enclosure.
2. Enclosure: Just like the enclosures used in any other application, contactors also
feature an enclosure, which provides insulation and protection from personnel
touching the contacts. The protective enclosure is made from different materials,
such as polycarbonate, polyester, Nylon 6, Bakelite, thermosetting plastics, and
others. Generally, the open-frame contactor features an additional enclosure,
which protects the device from bad weather, hazards of explosion, dust, and oil.
3. Contacts: This is yet another important component of this electrical device. The
current carrying task of the contactor is done by the contacts. There are different
types of contacts in a contactor namely, contact springs, auxiliary contacts, and
power contacts. Each type of contact has an individual role to play.
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
04
