We’re surrounded by machines. Especially in industrial environments, machines are everywhere. Folks control machines and our lives turn into easier. Once we want machines to start, stop and do totally different tasks, we want some interfaces. This is where push button switches come into play. Push button switches have various types each having a unique function.
Before looking at the types, let’s define what a push button switch is.
The push button switch is an electrical machine that transfers the operator’s pushing action to the machine. It helps the operator to make more accurate selections and maintains control of the system. The function of the push button switch is to start and stop the machine.
Push button switch types
Push button switches have numerous types. Some of them are:
Flush push button switch
The flush push button switch requires direct pressure on the operator’s surface. It has the actuator flush with the mounting ring and is often used for start buttons that must be protected from accidental initiation.
Prolonged push button switch
The prolonged push button switch has the actuator protruding about ¼ inch past the mounting ring and permits easier activation because the machine operator doesn’t want to put a finger squarely on the actuator to operate the push button. It’s usually used for probably the most prominent commands on an automation panel.
Mushroom push button switch
The mushroom-head push button switch has an actuator that extends over the perimeters of the mounting ring and has a diameter bigger than a typical push button. Because of their dimension and shape, mushroom-head push buttons are more easily seen and actuated and for these reasons are used as emergency stop buttons.
Illuminated push button switch
The illuminated push button operator unit usually makes use of integrated light-emitting diodes (LED) to provide the desired illumination. The illuminated push button switch combines illuminating and actuating functions in a single operator. It saves area and cost.
Double push button switch
The double push button switch combines two operators in the identical body. It saves house and cost. Besides, some models have an illumination function.
Parts of a push button switch
The construction of a push button switch consists of different parts.
Contact
The conducting part of a switch that makes or breaks a circuit. Available as “normally open”, in which the circuit is open in its neutral state, or “normally closed”, in which the circuit will be closed. The activation of the operator will reverse the impartial state of the contact.
Contact block
The part of a push button that encapsulates the contact. Blocks are held to the back of a device with a contact block holder.
Operator / Actuator
The part of the system that’s touched to operate.
Lamp block
The part of a push button that holds and activates the light bulb when it receives the appropriate signal.
Working types of push button switches
Maintained
A circuit that continues to be closed after pressure is launched from the button. Momentary-type push button operators return to their regular on or off state as quickly as the operator is released.
Momentary
A closed-circuit that lasts only so long as pressure is maintained on the button. Unlike momentary push button operators, maintained types require you to press and launch the operator to switch the contacts to their “on” state and to press and release the operator a second time to return the contacts to their off state.
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