Emergency Stop Rotary Button Switch  is a safety mechanism used in industrial settings to quickly halt machinery in an emergency. 

Function: Stops machinery operation in emergencies.
Activation: Push the red mushroom-shaped button to activate.
Reset: Turn the key to reset the switch.
Contacts: Features 1 normally closed (NC) contact.
Voltage: Rated for AC 50/60Hz up to 380V and DC up to 220V.
Protection: Offers IP40 protection, with IP65 available.
Size: 40mm mounting diameter.
Material: Typically made with a plastic or metal housing.