A switch monitors an access (A) to a machine or plant. The switch has a switching device (3) housing switching mechanism, an actuator device (2), and a push-button panel (12). The housing switching mechanism operatively connects to one or more circuits of the machine or plant. The actuator device (2) interacts with the switching mechanism at the opening/closing of the access (A). The push-button panel (12) has a shell (14) provided with controls (13) designed to operate on one or more of the circuits of the machine or plant. The shell anchors to a fixed part (F) of the access (A) to allow the rotation of the shell (14) around a rotation axis (R), so as to vary an orientation of the shell (14) with respect to the switching device (3) and/or to control and/or service circuits.