This Harmony XB4, triple head has 1 red and 2 green buttons, operates with a spring return mechanism. It is marked with "I", "STOP" and "II" symbols. This 3-function headprovides a complete 3 button interface to your machines with a single panel cut-out. It is easily assembled with a collar and contact blocks to fulfills a large variety of functions. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66 / IP67 / IP69 / IP69K. It has a metal bezel, this makes it Ideal for applications requiring high impact and vibration resistance. It is designed to fit in a standard 22mm cutout, ensuring compatibility when installing in pre-existing machinery. Its wide range of operating temperatures from -40°C to 70°C allows versatility in usage of product.