ProMax PST16240RL Push Button Latching Switch Round 240V Red Indicator Light

Specifications:

• Brand: ProMax
  
• Model: PST16240RL-11
• Mounting Hole Diameter: 16mm
• Switch Type: Latching (Self-locking - Push to Turn ON, Push again to Turn OFF)
• Switch No. of Poles: 1 Pole with Common, NO and NC Contacts 
• Indicator Color: Red LED
• LED Operating Voltage: 240V AC/DC
• Max Load Switching Voltage: 300V AC, 100V DC
• Max Load Switching Current: 3A @ 240V AC, 0.5A @ 24V DC
• Contact Configuration: 1NO 1NC (Single Pole Double Throw)
• Terminal Type: Quick-Connect Terminals
• Head Shape: Round/Flat

Key Applications 

• Industrial Panels: Main power toggle for machinery and control cabinets.
  Smart Home Automation: Manual override switch for high-voltage relay circuits.
  
• Test Benches: Emergency stop or mode-selection switch for lab power supplies.
  
• Custom Appliances: Ideal for DIY coffee machines, amplifiers, or power strips.

Project Evolution

• Prerequisites: If you have worked with basic 5V tactile buttons or breadboard switches, this is your next step.
  
• Feature Upgrade: Moving to the 16mm 240V Latching Switch allows you to move away from low-power logic and directly control AC appliances with integrated visual status. It simplifies your panel design by combining the switch and the pilot light into one 16mm hole.
  
• Effort Level: Intermediate. Working with 240V requires careful insulation and soldering skills. Ensure all connections are heat-shrinked for safety.

Virtual Technician & Wiring

 SAFETY WARNING: This switch is rated for 240V AC. Ensure the power is disconnected before installation. Use Probots™ Logic-Safe  practices: never mix high-voltage AC lines with low-voltage DC logic wires in the same tight bundle without proper insulation.

Pin Mapping 

• Pins "+" and "-": LED Indicator Terminals (240V AC).
  
• Pin "C" (Common): Incoming Power.
  
• Pin "NO" (Normally Open): Connect to Load (Active when button is pressed).
  
• Pin "NC" (Normally Closed): Connect to Load (Active when button is released).

Package includes:

1 X ProMax PST16240RL Push Button Latching Switch Round 240V Red Indicator Light

Frequently Asked Questions (FAQ)

1. What is a latching switch?
   A latching switch stays in its new state (ON or OFF) after being pressed until it is pressed again.
2. Does the LED require a separate resistor for 240V?
   No, the LED is rated for 240V AC and has internal current-limiting components.
3. Can I use this switch for 12V DC applications?
   While the contacts will work, the Red LED indicator is designed for 240V AC and will not light up at 12V.
4. What is the mounting hole size?
   It requires a standard 16mm diameter circular cutout.
5. Is the switch waterproof?
   It is splash-resistant from the front (IP40/IP65 depending on seal), but the rear terminals must be kept dry.
6. Can I use this with an Arduino?
   Yes, but only for the switching side (dry contact). Do not connect 240V to the Arduino pins.
7. What is the maximum current rating?
   It is typically rated for up to 3A or 5A at 240V AC (check specific batch labels).
8. How do I wire the LED so it's always ON?
   Connect the LED terminals directly to your 240V input source.
9. How do I wire the LED to turn ON only when the button is pressed? Jumper the "+" LED pin to the "NO" terminal.
10. What type of terminals does it have?
    It features silver-alloy solder lugs that also accept small quick-connect crimps.
11. Is the body made of metal or plastic?
    This version features a high-grade, flame-retardant plastic body.
12. What is the depth of the switch behind the panel?
    Approximately 35mm including terminals.
13. Can this replace a standard rocker switch?
    Yes, provided the 16mm hole size is compatible with your panel.
14. Does it come with the mounting nut?
    Yes, the hex nut and rubber O-ring are included.
15. What happens if I reverse the polarity on the LED pins?
    For AC, polarity doesn't matter; the LED will light up either way.
16. Is it suitable for an Emergency Stop?
    While latching, it is not a standard "Mushroom" E-Stop. Use for general control only.
17. Does the button stay physically depressed when ON?
    Yes, the physical height of the button changes slightly when latched.
18. Can I use this with 110V AC?
    Yes, but the LED indicator will be significantly dimmer than at 240V.
19. What is the contact resistance?
    Typically less than 50mΩ.
20. Is there a 22mm version available?
    Yes, Probots carries various sizes; check our "Switches" category for alternatives.