Allen-Bradley 800MS-H48BLAK Key Lock Selector Switch

Allen-Bradley 800MS-H48BLAK is a compact, small-square two-position key-lock selector switch from Allen-Bradley. This device is designed for panel-mount control applications and provides a secure means to select between two discrete operating states, with the selector controlled by a keyed lock to restrict access. The 800MS-H48BLAK variant is identified by the H48BLAK code within the 800MS family, and the suffix "BLAK" indicates a black housing finish. In industrial environments where simple, reliable mode selection is required, this two-position selector switch offers a tangible control interface: turning or actuating the knob moves the internal contacts between two fixed states, enabling straightforward start/stop or mode selection depending on the system design. The 800MS line is part of Allen-Bradley's broader 800-series of selector switches, frequently used in machinery controls and safety interlocks to enable authorized operator actions without requiring full electronic changes. Because the model is keyed, maintenance staff can reconfigure the lock to match security policies, while the compact form factor helps fit into tight panel spaces while maintaining clear operator feedback through the actuator position.