Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
coil |
A conductor formed into loops to create an electromagnetic field when current flows through the coil |
|
core |
A stationary electromagnet in a relay or contractor, sometimes called an E-frame. It becomes magnetized when the coil is energized. armature |
|
armature |
A moveable metal part that is attracted to the magnetized core that provides the mechanical action that changes the position of the contacts that are connected to it. |
|
armature springs |
Return the armature back to its normal position when the coil is de-energized |
|
contacts |
Provide the switching action in the controlled circuit |
|
contact springs |
Allow the contacts to come together without bouncing and maintain proper pressure on the closed contacts |
|
Form A |
SPST-NO |
|
Form A |
SPST-NO |
|
Form B |
SPST-NC |
|
Form A |
SPST-NO |
|
Form B |
SPST-NC |
|
Form C |
SPDT |
|
Form X |
SPST-NO-DM |
|
Form X |
SPST-NO-DM |
|
Form Y |
SPST-NC-DB |
|
Seal-In Voltage |
Minimum voltage required to pull in and seal the armature of a relay contractor. Usually 85% of rated Voltage |
|
Another name for Thermal magnetic circuit breakers. |
time-limit circuit breakers |
|
Difference between Instantaneous and Thermal magnetic [T.M.] circuit breakers |
T.M. Circuit breakers protect from overload current conditions, not just short-circuits |
|
The two types of cartridge and plug fuses |
1. non-time-delay 2. time-delay |
|
Another name for non-time-delay fuses |
single-element fuses |