Motor Control - Relays & Contactors

In a de-energized normally open contactor:

• The contacts are touching

• The contacts do what they feel like

• The contacts are NOT touching

Auxiliary contacts control:

• Smaller current devices

• Larger current devices

• Using the Force

What item do ONLY AC relays need?

• Movable Contacts

• Armature

• Spring

• Shading Coil

What can be used to minimize Eddy currents?

• Blowout Coil

• Laminated cores

• Arc Chute

• Vacuums

How many coils are needed in a latching/unlatching contactor

• 1

• 2

• 3

• 4

Which of the following ISN'T a type of relay?

• Mercury

• Tunnel

• Clapper

• Solid State