Industrial controls, automation, and machine safety monitor and regulate the operation of machinery and automated processes. Control stations, control pendants, and tumbler switches turn circuits on and off to control power or function. Operator switches and pilot lights control or indicate the status of equipment, machinery, and systems. Limit switches detect whether objects are present, absent, or at their destination. Snap-action switches react to physical contact to rapidly open or close circuits. Liquid-level control switches monitor fluid levels and trigger when they reach a preset threshold. Pressure and vacuum switches monitor systems and react to preset parameters. Proximity, motion, and vision sensors sense objects and workers to help prevent accidents. Machine safety products respond to sensors, powering down industrial machinery. Industrial automation manages and tracks conditions to control equipment usage. Relays control low-current equipment, devices, and machinery.