This Harmony XB5 emergency stop / shutdown 40mm mushroom button red button head operates with a locked push-pull mechanism. It has a protective collar. This emergency stop / shutdown button head, also called EMS (Emergency Machine Stop) and EMO (Emergency Off), provides an ergonomic interface for controlling your machines. It is easily mounted on compatible complete emergency stop and shutdown buttons. A clear color and distinctive 40mm mushroom shape make it clearly visible from a distance. Thanks to its IP66 protection rating, it is shockproof, dustproof, waterproof and vibration-resistant, making it ideal for use in harsh environments.