Schneider Electric, ZB4BS834, Harmony, Red Ø30 Emergency stop,switching off head Ø22 trigger and latching turn release

Amazon

Progress with confidence designed for industry Flexibility and a robust construction An ingenious locking system consisting of a snap-fit head and body, tightened with a single screw, ensures easy yet secure mounting

Radwell UK

PUSH BUTTON OPERATOR, HARMONY XB4 SERIES, FOR EMERGENCY SWITCHING OFF PUSH-BUTTON, ROUND, 22 MM DIAMETER, TURN TO RELEASE, RED, -40 TO +70 DEGREE C, IP66/69