Siemens 3SE3 120-1GW-Z Limit Switch

Siemens 3SE3 120-1GW-Z is a two-contact limit switch from the 3SE3 safety-switch family, designed for end-of-travel and position sensing in industrial automation. It provides one normally open (NO) and one normally closed (NC) contact, enabling straightforward signaling of both active and idle states as a machine reaches a limit. The exact model 3SE3 120-1GW-Z identifies a 120-series variant within the 3SE3 lineup and is sold as a genuine Siemens component (Made in Germany). Siemens describes the 3SE3 120-series as safety limit switches suitable for guarding and control tasks on production lines. Electrical ratings for these switches commonly include a current capacity up to 6 A (TDz), supporting typical control circuits in manufacturing environments. This variant is widely listed by distributors under the same model number, for example as 3SE3-120-1GW-Z, reflecting Siemens OEM heritage and global availability. With dual contacts in a compact housing, it is well suited for end-stop detection, machine guarding, and basic safety interlocks on automation equipment such as packaging lines and assembly machines.