ZB4BS864 - 

Harmony ZB4 Emergency Stop Push Buttons
The Harmony ZB4 metal emergency stop range from Telemecanique features trigger action actuation push button heads, this eliminates the complicated decision of which emergency stop push button you need for the desired application and which standard it must conform to. This range is designed to comply with the two key standards IEC 60204 and ISO 13850. The Harmony ZB4 range offers a metal series of emergency stop push button heads with a range of push button diameters and operating types.