Siemens 3SB03-K4R Mushroom Pushbutton Red Lock Twist Release

Siemens 3SB03-K4R Red Mushroom Pushbutton with Lock-Twist Release is a panel-mount operator designed for industrial control applications. It features a bold red mushroom head with a 40 mm diameter and a built-in twist-release locking mechanism to resist accidental operation, making it suitable for critical control points on machinery and conveyors. As a member of Siemens' SIRIUS ACT 3SB pushbutton family, the 3SB03-K4R represents a robust, mechanically actuated input device intended for use on control panels in demanding environments. The K4R suffix identifies this specific red, lockable twist-release configuration within the 3SB line, delivering reliable actuation with clear operator feedback. Typical uses include operator input for start/stop or mode selection on industrial equipment where visibility and deliberate action are essential.