NEF30 type control buttons with metal bodies are designed to be built into standardized Ø30.5 mm holes made in consoles, control and signaling boards or directly in the bodies of machines and devices. NEF30 type buttons have a modular structure. Each push-button consists of: a drive element called the push-button drive a switching element consisting of one, two or three connectors attached to the drive. The NEF30 pushbuttons are mounted using fastening nuts, without the need to separate the drive and connectors.