NEF 30-ŁK is a variation of the Ø30 button activated by turning the drive with a 9mm triangular key. It can be used wherever switching operations can only be performed by an authorized person who has a special tool in the form of a triangular key, e.g. a device service technician.
A lock button is designed to be built into standard Ø30.5mm holes in control panels, control and signaling boards or directly in the bodies of machines and devices. NEF30-ŁK consists of two elements: switching and driving, permanently connected with each other. The switching element is a S10J cam switch with a modified axis. The driving part is built on the NEF30 body. The position of switch can be changed with a triangular key.