As per AS 4024.1604 and ISO 13850, the emergency stop function is a function that is intended to avert an impending hazard for personnel, damage to the machine or work in progress, or to alleviate existing hazards, and that is to be triggered by a single user action.
For this purpose Emergency stop control gear should be equipped with a red pushbutton; or red mushroom-head button; the button is to have a yellow background. The emergency stop function is generally only allowed to provide safety in addition to the directly acting safety functions. Directly acting safety functions are, for example, safety switches on safety doors that cause a hazard to be shut down without conscious action by the user.
Treotham offers Emergency stops from SNH series. SNH series have modular design whereby various actuating elements can be freely combined with the chosen contact design. It also has a special failure protection feature which automatically detects when a contact block is removed from the respective actuating element and then switches off safely.