Siemens 3SE03-NN2 Limit Switch

Siemens 3SE03-NN2 is a North American limit switch in the 3SE03 family, featuring a side-rotary operating head with a center-neutral configuration for precise end-of-travel sensing in automation equipment. It uses snap-action contacts and is rated for up to 600 VAC and 300 VDC, enabling reliable switching of control circuits across industrial environments. The NN2 designation identifies a specific head/connector option within the modular 3SE03 system, designed for plug-in head mounting with a 5° pretravel to operate the contacts; Siemens also offers a range of actuators sold separately, such as plain side plungers or rollers, to tailor actuation to space and motion. Typical applications include position sensing and end-of-travel detection on conveyors, presses, and packaging lines where rugged construction and fast, repeatable switching are essential.