This Siemens 3SE5 122-0CE01 mechanical limit switch comes as a complete unit with a 56 mm wide metal enclosure, one NO and one NC snap action contact, and is suitable for use in plant and building automation systems. The 56 mm long metal roller lever actuator has a 22 mm diameter plastic roller. The snap action operation provides simultaneous switching of all contacts, regardless of actuator speed. There are five directions of approach for the actuator for mounting flexibility. This mechanical limit switch conforms to the European Committee for Electrotechnical Standardization (CENELEC) EN 50047 standard for dimensions and mechanical data and the EN 50041 standard for quality assurance, and is suitable for use in applications with approach angles of 30 degrees and trailing angles of 45 degrees.SpecificationsPositive opening of NC contactsIEC 60 947-5-1 Quality assuranceEN 50041Dimensions and mechanical dataEN 50047Degree of protectionIP67Mechanical limit switches are used to make or break electrical circuit connections as part of a facility automation system. The switch is composed of a contact block with one or more electrical contacts, wiring connections, an enclosure for protection, and an actuator head for tracking object movement. Switch contacts can be normally open or normally closed, and switch connections can be either quick or slow, depending on the switch design, and they can include status LEDs and connector sockets. Actuator head types include rounded and roller plungers, roller and angular roller levers, spring rods, twist levers and rod actuators with a twist actuator, and fork levers with a twist actuator. Mechanical limit switches are used in many applications such as elevators, conveyors, doors, water tanks, railroad crossings, emergency exits, and as emergency shutoffs in industrial workplaces.Siemens manufactures electronic products for building automation, industrial drives, lighting, energy generation, medical equipment, and rail transportation. The company, founded in 1847 and headquartered in Germany, meets International Standards Organization (ISO) standards 14001, 9001 and TS 16949.