This Harmony 9001SK modular red push button has 2 positions, works with spring return. It has a round shape and is supplied with contact block, 57mm mushroom head and 1 x normally closed + 1 x normally open contact. It fits in a 30mm hole. This 57mm mushroom head is ideal for situations where quick actions are required for a process or machine to work correctly or where operator movements require maximum ergonomics. It can be easily combined with the Harmony series contact blocks to perform a variety of control functions. A distinctive mushroom shape makes it visually clear 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.