Mags

Front 1

coil

Back 1

A conductor formed into loops to create an electromagnetic field when current flows through the coil

Front 2

core

Back 2

A stationary electromagnet in a relay or contractor, sometimes called an E-frame. It becomes magnetized when the coil is energized. armature

Front 3

armature

Back 3

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.

Front 4

armature springs

Back 4

Return the armature back to its normal position when the coil is de-energized

Front 5

contacts

Back 5

Provide the switching action in the controlled circuit

Front 6

contact springs

Back 6

Allow the contacts to come together without bouncing and maintain proper pressure on the closed contacts

Front 7

Form A

Back 7

SPST-NO

Front 8

Form A

Back 8

SPST-NO

Front 9

Form B

Back 9

SPST-NC

Front 10

Form A

Back 10

SPST-NO

Front 11

Form B

Back 11

SPST-NC

Front 12

Form C

Back 12

SPDT

Front 13

Form X

Back 13

SPST-NO-DM

Front 14

Form X

Back 14

SPST-NO-DM

Front 15

Form Y

Back 15

SPST-NC-DB

Front 16

Seal-In Voltage

Back 16

Minimum voltage required to pull in and seal the armature of a relay contractor.

Usually 85% of rated Voltage

Front 17

Another name for Thermal magnetic circuit breakers.

Back 17

time-limit circuit breakers

Front 18

Difference between Instantaneous and Thermal magnetic [T.M.] circuit breakers

Back 18

T.M. Circuit breakers protect from overload current conditions, not just short-circuits

Front 19

The two types of cartridge and plug fuses

Back 19

1. non-time-delay

2. time-delay

Front 20

Another name for non-time-delay fuses

Back 20

single-element fuses