Siemens 3SE2120-1B Limit Switch

The limit switch, also known as position switch or limit detector, from Siemens with type number 3SE2120-1B is an electrical switch for reliable position monitoring in machines and systems. It has the dimensions 13 x 5 x 5 cm and weighs 0.2 kg. Limit switches are used to detect the physical presence or the achievement of a specific position of a machine part or object and to output an electrical signal. They contribute significantly to the safety and automation of processes. Typical applications include the control of conveyor belts, doors and gates, as well as in machine tools for limiting movement ranges or for start/stop control of processes.