Siemens 3SE03-BW1 Limit Switch

Siemens 3SE03-BW1 Limit Switch is a wobble-head, metal-bodied limit switch that provides four snap-action contacts—two normally open and two normally closed—for compact, plug-in control circuits. The wobble-head actuation offers flexible triggering in tight spaces, while the momentary contacts deliver fast, repeatable switching. A separate operating lever is available (sold separately) to tailor actuation to your application. The unit features a 1/2" NPT threaded opening for straightforward installation into panels or machine frames, and its modular plug-in head design supports selecting among compatible actuation heads within the 3SE03 family. This model is listed in catalogs as E50BW1 and is related to other 3SE03 head configurations such as 3SE03-SB, 3SE03-DW1, and 3SE03-RB as part of Siemens North American limit-switch offerings. Commonly used for position sensing and basic interlock tasks on automation lines and conveyors, the 3SE03-BW1 provides a rugged, compact solution when four-contact signaling and reliable snap-action switching are required.