ProMax 16mm PPS16006GRM Metal Push Button Switch Waterproof Momentary Green (3V-6V)

Specifications:

• Mounting Hole Diameter: 16mm
• Operation Type: Momentary (Spring Return)
• Switch Contacts: 1NO + 1NC (Common, Normally Open, Normally Closed)
• LED Illumination Color: Green
• LED Voltage Range: 3V – 6V DC
• LED Current Draw: 15mA 
• Switch Rating: 3A / 250V AC
• Contact Material: Silver Alloy
• Body Material: Stainless Steel / Nickel-Plated Brass
• Protection Level: IP65 Waterproof 
• Terminal Type: 5 Pin Spade Terminals (2 for LED, 3 for Switch Contacts)
• Head Shape: Flat Round
• Operating Temperature: -20°C to +55°C
• Compatible Platforms: Arduino, ESP32, Raspberry Pi, PLC Industrial Control Panels

Unlock New Capabilities

Past Projects
If you've already experimented with basic plastic tactile buttons on a breadboard or wired up basic toggle switches for desktop gadgets, you already understand how to open and close an electrical circuit. This means you are perfectly ready to graduate from fragile prototyping components to rugged, panel-mounted industrial hardware. 

Feature Upgrade
This ProMax 16mm metal switch unlocks physical human-machine interface (HMI) inputs for severe environments. It enables you to build customized outdoor automation kiosks, heavy-duty test benches, marine-grade control dashboards, and specialized safety reset triggers that can withstand mechanical abuse and moisture. 

Minimum hardware to get started:

• 16mm ProMax Switch Socket Connector — needed to establish secure, vibration-resistant spade terminal contacts without soldering directly to the switch pins.
• Regulated 3V to 6V Power Source — essential to drive the internal green ring LED safely; applying voltages higher than 6V will permanently damage the indicator element.
• Multifunctional Test Meter — required to safely map and confirm terminal continuity across Common, Normally Open, and Normally Closed states before final panel mounting.

Virtual Technician & Wiring Guide

⚠️ Safety Warnings:

• LED Voltage Threshold: Do NOT connect the LED terminals directly to standard 12V or 24V power rails. The integrated internal resistor is optimized strictly for 3V to 6V DC operation.
• Current Limitations: The mechanical switch contacts are rated for a maximum of 3A at 250V AC. Exceeding this limit will weld the internal micro-contacts shut, causing permanent failure. Use an external relay for high-power inductive loads like heavy DC motors or pumps.
• Soldering Heat Hazard: If opting to solder directly to the spade terminals instead of using a socket connector, limit soldering iron contact to under 3 seconds at 300°C to prevent internal plastic housing deformation.

Wiring — ProMax PPS16006GRM to a Standard 5V Control Setup:

 
Package Includes:

1× ProMax 16mm PPS16006GRM Metal Push Button Switch

1× Nitrile Rubber Sealing O-Ring Washer

1× Hexagonal Panel Locking Nut

Frequently Asked Questions

1. What is the function of the terminal marked 'C'?
   The 'C' stands for Common. It is the shared input pin that receives the supply voltage or signal, which is then routed to either the Normally Open (NO) or Normally Closed (NC) pin depending on whether the button is pressed.
2. Can I wire this switch without using a socket connector?
   Yes, you can solder wires directly to the spade terminals. However, you must use heat shrink tubing around each terminal to prevent accidental short circuits, and limit iron contact to under 3 seconds to avoid heat damage to the internal switch contacts.
3. How do I connect the switch so that the green ring LED stays turned on continuously?
   To keep the LED illuminated constantly, wire the positive terminal (+) directly to your 3V–6V DC supply rail and the negative terminal (-) to the common ground rail, independent of the switch contact wiring.
4. How do I wire the LED so that it only turns on when I press the button?
   Connect your supply voltage to the Common (C) terminal, then bridge a short jumper wire from the Normally Open (NO) terminal to the LED positive (+) terminal. Finally, connect the LED negative (-) terminal to your circuit ground.
5. Can I use a 5V supply to power the LED ring?
   Yes, the internal current-limiting resistor is specifically optimized for a 3V to 6V input range, meaning a 5V supply will illuminate the LED beautifully at its native brightness without risking a burnout.
6. What happens if I connect the LED pins to a 12V DC power supply?
   Connecting the LED terminals directly to 12V will overload the integrated resistor, causing the green LED element to burn out permanently. If you must use 12V, you must place a external $470\,\Omega$ resistor in series with the positive terminal.
7. Are the switch contacts rated to control a 230V AC mains load directly?
   The switch mechanism is rated up to 3A at 250V AC. While it can theoretically handle light AC loads under 3A, we strongly recommend using the switch to drive a dedicated 5V/12V relay module to isolate high-voltage mains power from your front panel control interface.
8. Can this switch be used with 3.3V logic microcontrollers like the ESP32 or Raspberry Pi Pico?
   Yes, the LED illuminates perfectly fine on a 3.3V rail, drawing approximately 10-12mA. The switch contacts are purely mechanical and can seamlessly route 3.3V logic signals to your GPIO pins.
9. What does 'Momentary' operation mean for this product?Momentary operation means the switch contact changes state only while physical pressure is applied to the actuator. The moment you release your finger, an internal spring forces the button back to its default rest state.
10. What is the difference between the Normally Open (NO) and Normally Closed (NC) terminals?
    The NO terminal remains disconnected from Common until the button is pushed. The NC terminal is actively connected to Common by default and breaks its connection when the button is pushed.
11. Can I utilize both the NO and NC functions simultaneously?
    Yes, because the switch features a single-pole double-throw (SPDT) architecture, you can use it to toggle between two separate circuit branches—for example, switching a panel indicator light from red (via NC) to green (via NO) upon actuation.
12. What is the structural mechanical lifespan of this switch?
    The ProMax heavy-duty actuation assembly is rated for a minimum mechanical lifespan of 200,000 push-and-release cycles under nominal electrical loads.
13. What size hole do I need to drill in my control panel enclosure?
    You need to drill a precise 16mm diameter mounting hole. The threaded body of the switch drops directly through this cutout and is secured from behind using the included hex backing nut.
14. What is the maximum thickness of the front panel that this switch can mount to?
    The threaded section allows the switch to be securely clamped onto front panels up to 8mm in thickness while still providing enough thread engagement for the locking nut and rubber seal.
15. What is the purpose of the included rubber O-ring?
    The rubber washer sits on the outside of your enclosure panel, directly underneath the wide metal head of the button. When the rear nut is tightened, it compresses this O-ring to form a water-resistant seal.
16. Is this button suitable for complete underwater submersion applications?
    No, the switch carries an IP65 rating, meaning it is protected against splashing water, rain, rainstorms, and direct low-pressure water jets. It is not designed to withstand continuous underwater submersion.
17. Is the metal body prone to rusting if deployed outdoors?
    The switch body is constructed from nickel-plated brass and stainless steel alloy components, providing excellent resistance against rust, corrosion, and UV degradation in typical outdoor or humid industrial environments.
18. Why does the LED ring fail to turn on even though my main circuit load is running?
    The LED element operates on an entirely separate internal electrical circuit from the mechanical switch contacts. Double-check that you have wired a dedicated 3V-6V source across the specific + and - terminals.
19. Why is the LED ring not turning on despite having 5V applied to the pins?
    Unlike standard mechanical switch pins, the LED pins are polarized. Ensure that the positive lead of your power supply is attached to the terminal stamped with the + symbol and the ground lead is connected to the - symbol.
20. Why is my microcontroller registering multiple inputs from a single physical button press?
    Mechanical switches naturally suffer from contact bounce, where the internal contacts vibrate rapidly for a few milliseconds upon closing. You can resolve this easily by implementing a short 10-20ms software debounce delay in your code layout.