Illuminated Pushbutton Switches: Construction and Specifications

This document provides a comprehensive overview of illuminated pushbutton switches, detailing their construction, operation, illumination, mechanical dimensions, and recommended usage.

1. Overview of Illuminated Pushbuttons

These switches come in various head styles including extended round heads, full shroud extended heads, mushroom heads (approximately 40 mm diameter), and metal bezel variants. Illumination options include built-in LEDs (model LAED-6) and incandescent lamps (model LA-T6).

2. Operation Types and Contact Configurations

• Operation Modes: Momentary (instantaneous) and Maintained (alternate) types.
• Contact Structures: 1NO (Normally Open), 1NC (Normally Closed), 2NO, 2NC, and combined 1NO-1NC configurations.

3. Illumination Types and Color Coding

Illumination is provided by either LEDs or incandescent lamps with specific voltage ratings. Lens and LED colors are coded as follows:

• A: Amber
• C: Clear (lens)
• G: Green
• PW: Pure White (LED only)
• R: Red
• S: Blue
• W: White (milky)
• Y: Yellow

Voltage codes correspond to lamp voltage ratings such as 6V, 12V, 24V, 110V, and 230/240V AC/DC, ensuring correct illumination operation.

4. Model Numbering and Variants

Model numbers encode key features including contact configuration, illumination type, operation mode, and voltage. For example, a model like A20L-M2E10Q0② indicates a 1NO contact, momentary operation, LED illumination with a specific voltage code.

5. Mechanical Dimensions and Panel Compatibility

• Extended round head diameter: ~28.8 mm; height: ~45.7 mm.
• Full shroud extended head: Similar dimensions with additional shroud coverage.
• Mushroom head: Diameter ~40 mm; height ~45.7 mm.
• Metal bezel variants: Dimensions vary by bezel style (flush, extended, low silhouette).
• Panel thickness compatibility ranges from 0.8 mm to 6 mm for secure mounting.

6. Metal Bezel Series

The A204L metal bezel series offers enhanced durability and aesthetic options with flush, extended, full shroud, and mushroom head styles. Model suffixes like '-B' or '-BU' denote bezel types. Illumination and contact options mirror the standard series.

7. Critical Parameters and Limitations

• Maximum operating voltage: 250V AC/DC.
• Panel thickness: 0.8 to 6 mm.
• Illumination voltage must match specified codes to ensure proper lamp function.
• Operation type selection (momentary or maintained) must align with application requirements.

8. Best Practices and Recommendations

• Select illumination color and type based on visibility needs and environment.
• Confirm contact configuration matches control circuit demands.
• Ensure panel thickness compatibility for reliable installation.
• Use metal bezel variants for applications requiring enhanced mechanical protection and improved aesthetics.

9. Summary of Key Parameters

10. Usage Notes

Proper selection of lamp type, color, and voltage is essential to meet application requirements. The mushroom head design and panel thickness compatibility facilitate ergonomic operation and ease of installation. Metal bezel variants are recommended for enhanced durability and aesthetic appeal in demanding environments.