Siemens AG 3SB11-00-4PA20 Keyed Selector Switch

Siemens AG 3SB11-00-4PA20 Keyed Selector Switch is a rugged, manually operated control device designed for selecting between electrical circuits or machine states within industrial automation systems. This keyed selector switch provides secure operation by requiring a physical key to rotate the actuator, helping prevent unauthorized or accidental changes in panel-mounted applications. Built for use in control cabinets and equipment enclosures, it is compatible with Siemens 3SB11-series hardware and is typically installed in front of the panel for quick state changes during setup, testing, or routine operation. While specific position counts and contact configurations vary by variant, the 3SB11 family generally supports multi-position selection and can be combined with corresponding contact blocks to establish the desired circuit paths. Applications include selecting run/stop modes, enabling or bypassing safety interlocks, and switching between process configurations on conveyors, packaging lines, CNC machinery, and other automated systems. In high-use environments, it offers robust mechanical design and reliable operation, with a mounting interface designed to fit standard panel cutouts and compatibility with Siemens actuators and housings in the 3SB11 product line.