Solenoids can be pull type or push type. In a pull type solenoid, which is the more common type, when the solenoid is energized the plunger pulls in towards the solenoid. Pull type solenoids can be internally or externally switched.

In a push type solenoid, when the solenoid is energized the plunger pushes out

away from the solenoid. All push type solenoids are externally switched. Both pull and push type solenoids are constructed in a similar manner and operate on the same principle. It is usually the application, mounting considerations, and direction of plunger motion needed that determine what type of solenoid will be used.