Overview

The R16-503A series is a reliable 16mm latching On & Off pushbutton switch designed for control panels, automation equipment, DIY electronics, and embedded applications. Built with a smooth actuation feel and long service life, it performs consistently even under demanding environmental conditions.

Two versions are available:

R16-503AD – includes a 3V LED indicator with 4-pin output (2 switch pins + 2 LED pins)
R16-503A – a non-illuminated model with a simple 2-pin switch configuration

Both variants maintain low contact resistance, strong insulation performance, and are rated for 3A at 250V AC. Their wide operating temperature range (−40°C to +80°C) ensures dependable operation across industrial and outdoor environments.

Specification

Technical details for R16-503A/AD 16mm Round Panel Mount Latching On & Off Pushbutton.

Specification	R16-503AD (With LED)	R16-503A (No LED)
Illumination	Yes	No
Button Type	Latching On & Off Pushbutton Switch
Mounting Hole Size	16 mm
Pin Count	4 Pins (2 switch + 2 LED)	2 Pins (switch only)
Electrical Rating	3A / 250V AC
LED Voltage	3V DC	—
Contact Resistance	≤ 50 mΩ
Insulation Resistance	≥ 100 MΩ
Mechanical Life	≥ 50,000 cycles
Electrical Life	≥ 10,000 cycles
Operating Temperature	−40°C to +80°C