Where SS-1E-4-ND sits in the Omron limit-switch line
The Omron SS-1E-4-ND belongs to the SS subminiature snap-action limit-switch family, the form factor most commonly specified where a panel cut-out or machine guard has to fit a short-body switch without giving up mechanical travel. Subminiature limit switches of this class normally wire into a safety circuit or a position-feedback loop on packaging, conveyor and small-oven guarding — the snap-action mechanism gives a defined make/break independent of actuator speed, which is the property a controls integrator relies on at the machine guard.
For a panel builder or MRO planner that means the part can be specified into a new build without a board spin, and a replacement spare ordered against the same order code will arrive on a manufacturer-traceable reel rather than a broker lot.