Today’s industrial control circuits have many automated features, including programmable logic options with computerized circuitry. However, some things have not changed and there is still the need for simple yet effective components like contactors and illuminated push button switches. Let’s take a look at some of the options you have for switches, to help you make the best decisions for control circuit design.
Toggle and Rocker Switches
There is still a place for these switches. They can be used for basic “on/off” functions and for manual control over all types of operations.
Limit Switches
A limit switch is an important control function. However, they are not usually found in control panels and are used to limit the function of industrial equipment. However, because they operate on lower voltages, they are considered control circuit components.
Momentary Contact Buttons
They can be non-illuminated or illuminated push button switches. This kind of switch is often used to start or end an automated process. Here is how they work:
Push the “on” button and it closes the electrical contacts. This sends energy to close the connection on a contactor or starter. Once power reaches the contact points they stay closed due to electromagnetism.
The “on” bush button contains a spring which returns it to its original position, breaking contact when you release it. The circuit is now closed and can operate as designed. In order to stop the process, an “off” button is pressed. When pushed, this opens contacts which are wired in series with the operating circuit. Once the circuit is open, everything stops.
Why Lights?
When you use illuminated puch button switches, they light up when the circuit is closed and go out once the circuit is open. This lets you monitor the circuit from the panel and you do not have to be out in the facility.
