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Illuminated and non-illuminated push button switches can provide the same switching function, but they differ in visibility, wiring, terminal arrangement, panel design, and cost. This guide explains how to choose between them.
Push button switches can be supplied with or without LED illumination.
Both types may provide the same momentary or latching switch function, but the illuminated version adds a visual indication circuit.
For equipment manufacturers, the choice affects more than appearance.
It can change the wiring design, terminal count, panel readability, power supply requirements, and operator experience.
What Is an Illuminated Push Button Switch?
An illuminated push button combines a mechanical switch with an LED light source.
The LED may illuminate:
• A center dot
• An outer ring
• The complete button surface
• A power symbol
• A customized symbol
The LED circuit is usually electrically separate from the switch contacts.
This allows the light and switching function to operate independently.
What Is a Non-Illuminated Push Button Switch?
A non-illuminated push button performs only the switching function.
It does not include an internal LED.
Equipment status may be shown through:
• A separate indicator light
• A display
• A screen
• Mechanical button position
• External panel markings
• No visual feedback
Non-illuminated buttons are often selected for simpler control panels or functions that do not require visible status confirmation.
Main Advantages of Illuminated Push Buttons
Clear Status Feedback
The LED can show whether equipment is powered, active, ready, stopped, or in a specific mode.
This can improve operator understanding and reduce incorrect operation.
Reduced Panel Components
An illuminated button can combine control and indication in one panel position.
This may reduce the need for a separate indicator light.
However, separate indicators may still be preferred when the equipment status must remain visible independently of the control button.
Better Low-Light Visibility
Illumination helps operators locate controls in dark cabs, indoor equipment, night operations, and enclosed control areas.
Improved Interface Design
Ring lights, symbols, and multiple colors can create a cleaner and more organized control panel.
Main Advantages of Non-Illuminated Push Buttons
Simpler Wiring
Without an LED circuit, the wiring is usually easier.
There are fewer terminals and no LED polarity or voltage requirements.
Lower Power Consumption
The switch does not require power for illumination.
Although LED consumption is generally low, this may still matter in battery-powered or low-power equipment.
Lower Cost
Non-illuminated designs usually have fewer components and may provide a more economical solution.
Fewer Electrical Variables
There is no need to confirm LED voltage, resistor configuration, brightness, polarity, or color.
This can simplify purchasing and production.
Wiring Differences
A non-illuminated switch only requires wiring for the switch contacts.
An illuminated version includes additional terminals or wires for the LED.
Depending on the product structure, the LED may have:
• One positive and one negative terminal
• Multiple positive and negative terminals
• Shared lighting terminals
• Separate terminals for different lighting areas
The exact wiring diagram must be confirmed.
A higher terminal count does not necessarily mean the switch controls more circuits. Some terminals may belong only to the LED.
LED Voltage Selection
The LED voltage must match the equipment power supply.
Common options may include low-voltage LED configurations such as 2.4V.
Other voltages can be achieved by adding a suitable resistor or using a customized internal circuit, depending on the product design.
Before ordering, confirm:
• Supply voltage
• AC or DC
• Required resistor
• Current direction
• Polarity
• Desired brightness
• Continuous or intermittent lighting
Applying the wrong voltage can damage the LED or produce unstable brightness.
Switch Rating and LED Rating Are Different
The switch contact rating and LED voltage are separate specifications.
For example, the contacts may switch a higher AC load, while the LED operates from a low-voltage DC supply.
The LED must not be connected directly to the contact load unless the complete circuit is designed for that arrangement.
The technical drawing should show the contact terminals and LED terminals separately.
LED Color and Equipment Meaning
Common LED colors include red, green, blue, yellow, and white.
The selected color should communicate a clear meaning.
Possible uses include:
• Red: stop, alarm, fault, emergency condition
• Green: running, available, ready, normal
• Yellow: warning, caution, pending condition
• Blue: special mode or user-defined function
• White: general status or neutral illumination
Color meaning should remain consistent across the full equipment interface.
In international markets, equipment designers should also consider local standards and customer conventions.
Ring Light vs. Dot Light
Ring Illumination
Ring illumination creates a visible light around the button.
Advantages include:
• Strong visibility
• Modern panel appearance
• Easy recognition from an angle
• Clear separation between functions
Dot Illumination
Dot illumination provides a smaller light area in the center.
Advantages include:
• Simpler appearance
• Lower visual intensity
• Compact lighting area
• Suitable for dense panels
The decision should be based on visibility requirements and panel design.
Symbol Illumination
Illuminated power symbols and customized icons can help operators understand the function without relying only on text.
Possible symbols include:
• Power
• Start
• Stop
• Lighting
• Fan
• Pump
• Direction
• Equipment-specific icons
Customized symbols should remain simple and readable.
Overly detailed graphics can become unclear on small button surfaces.
When to Use an Illuminated Push Button
An illuminated version is useful when:
• The operator needs immediate visual feedback
• The control is used in low-light conditions
• Panel space is limited
• A separate indicator light is not preferred
• Multiple operating modes must be distinguished
• The equipment interface requires color coding
• The button must be easy to locate
When to Use a Non-Illuminated Push Button
A non-illuminated version may be better when:
• A separate indicator light is already installed
• The function does not require status feedback
• Wiring simplicity is important
• Cost reduction is required
• The panel operates in bright conditions
• The switch is used only occasionally
• The equipment uses a screen for status display
Should the Light Follow the Switch Position?
Not always.
The LED can be wired in different ways.
It may:
• Stay on whenever equipment power is available
• Turn on when the switch is activated
• Be controlled by a PLC
• Indicate the actual equipment status
• Flash during a warning condition
• Operate independently from the button
For many applications, showing the actual equipment state is more useful than simply showing the physical button position.
For example, a button may be pressed, but the controlled motor may fail to start. If the LED is controlled by the equipment feedback circuit, the operator can see the real status.
Separate Indicator Light or Illuminated Button?
An illuminated button combines control and indication in one component.
A separate indicator light provides independent status visibility.
Use an illuminated button when:
• Panel space is limited
• The control and indication belong together
• Direct operator feedback is needed
Use a separate indicator light when:
• The status must remain visible without touching the control
• The indication represents a system condition rather than a button state
• The operator needs to monitor the equipment from a distance
• Multiple indicators are grouped together
In some panels, the best solution is to use both.
Environmental and Sealing Considerations
Illuminated and non-illuminated switches may both be available with IP67 front-panel sealing.
The LED itself does not automatically reduce the sealing level.
However, buyers should still confirm:
• Front-panel rating
• Rear terminal protection
• Number of terminals
• Wire sealing
• Panel washer
• Installation method
More terminals may require more rear-panel space and additional wiring protection.
Reliability Considerations
An illuminated switch contains more components than a non-illuminated version.
The LED has its own operating life, voltage limits, and temperature range.
Buyers should review:
• LED operating voltage
• Continuous duty capability
• Heat generation
• Expected service life
• Brightness consistency
• Color consistency
• Temperature performance
For long-life equipment, replaceability and maintenance should also be considered.
Cost Considerations
The illuminated version usually costs more because it includes:
• LED components
• Additional terminals
• More assembly steps
• Additional testing
• More complex wiring
However, it may reduce the need for a separate indicator light and panel opening.
The complete system cost should be compared, not only the unit price of the switch.
Questions to Confirm Before Ordering
1.Is visual status feedback required?
2.Should the light indicate button position or actual equipment status?
3.What LED color is needed?
4.What is the supply voltage?
5.Is AC or DC used?
6.Is a resistor required?
7.Is ring, dot, or symbol illumination preferred?
8.How many switch-contact terminals are required?
9.How many LED terminals are included?
10.Is IP67 front-panel sealing required?
11.Is a separate indicator light already used?
12.Is the control operated in low-light conditions?
Conclusion
Illuminated and non-illuminated push buttons can provide the same basic switching function, but they support different panel and operator requirements.
Illuminated versions offer clear visual feedback and can combine control with indication.
Non-illuminated versions provide simpler wiring, lower cost, and fewer electrical variables.
The correct choice depends on the equipment status logic, power supply, operator environment, available panel space, and total system design.
TOOWEI supplies illuminated and non-illuminated push button switches in multiple mounting sizes, LED colors, housing materials, button styles, and circuit configurations.
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