Introduction to Industrial Automation

2.1.11   Solenoid Linear Actuators

A general purpose solenoid actuator is an electromagnetic device that converts electric energy 

into a mechanical pushing or pulling force or motion. Most solenoid actuators produce a linear 

motion called therefore “linear solenoid actuators”; however, rotational solenoids are also available. 

The linear solenoid actuator works on the same basic principle as the electromagnet of the elec-

tromechanical relays that causes the required movement of contacts. Usually, the general purpose 

linear solenoid actuators produce small movements and apply low-range forces, capable though of 

opening or closing valves, activating latches or similar mechanisms, and generally moving light 

mechanical elements. The linear solenoid actuators, as shown in Figure 2.18, consist of an electric 

SPDT

DPDT

3PDT

SPST

DPST

3PST